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Yamamoto G, Ito T, Suzuki O, Kamae N, Kakuta M, Takahashi A, Iuchi K, Arai T, Ishida H, Akagi K. Concordance between microsatellite instability testing and immunohistochemistry for mismatch repair proteins and efficient screening of mismatch repair deficient gastric cancer. Oncol Lett 2023; 26:494. [PMID: 37854865 PMCID: PMC10579988 DOI: 10.3892/ol.2023.14081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Accepted: 09/07/2023] [Indexed: 10/20/2023] Open
Abstract
Microsatellite instability (MSI) testing, an established technique that has gained prominence in recent years for its predictive potential regarding the efficacy of immune checkpoint inhibitors, is used to evaluate DNA mismatch repair (MMR) deficiency (dMMR). As with other methods, the immunohistochemistry (IHC) of MMR proteins is also widely adopted. Although both techniques have been validated, their concordance rate remains unknown, particularly regarding non-colorectal cancer. Therefore, the aim of the present study was to explore and elucidate their concordance in the context of gastric cancer (GC). A total of 489 surgically resected primary GC tissues were analyzed to compare the results yielded by the MSI test and those from IHC. Of 488 GC cases, 56 (11.5%) exhibited a loss of MMR proteins, whereas 52 (10.7%) were classified as high-frequency MSI (MSI-H). The concordance rate between these two categories was 99.2%. The microsatellite markers BAT26 and MONO27 demonstrated 100% sensitivity and 99.5% specificity in detecting dMMR GC. In addition, histopathological analysis revealed that MSI-H was more prevalent in GCs exhibiting coexisting Tub2 and Por1 subtypes. However, four discordant cases were observed. All four cases were microsatellite-stable cases but exhibited loss of MLH1 protein expression with hypermethylation of the MLH1 promoter. The results of the present study highlight that while there is a strong concordance between MSI and IHC testing results for determining dMMR status, IHC testing may offer superior efficacy in detecting dMMR.
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Affiliation(s)
- Gou Yamamoto
- Department of Molecular Diagnosis and Cancer Prevention, Saitama Cancer Center, Saitama 362-0806, Japan
| | - Tetsuya Ito
- Department of Digestive Tract and General Surgery, Saitama Medical Center, Saitama Medical University, Saitama 350-8550, Japan
| | - Okihide Suzuki
- Department of Digestive Tract and General Surgery, Saitama Medical Center, Saitama Medical University, Saitama 350-8550, Japan
- Department of Clinical Genetics, Saitama Medical Center, Saitama Medical University, Saitama 350-8550, Japan
| | - Nao Kamae
- Department of Clinical Genetics, Saitama Medical Center, Saitama Medical University, Saitama 350-8550, Japan
| | - Miho Kakuta
- Department of Molecular Diagnosis and Cancer Prevention, Saitama Cancer Center, Saitama 362-0806, Japan
| | - Akemi Takahashi
- Department of Molecular Diagnosis and Cancer Prevention, Saitama Cancer Center, Saitama 362-0806, Japan
| | - Katsuya Iuchi
- Department of Molecular Diagnosis and Cancer Prevention, Saitama Cancer Center, Saitama 362-0806, Japan
| | - Tomio Arai
- Department of Pathology, Tokyo Metropolitan Geriatric Hospital, Tokyo 173-0015, Japan
| | - Hideyuki Ishida
- Department of Digestive Tract and General Surgery, Saitama Medical Center, Saitama Medical University, Saitama 350-8550, Japan
- Department of Clinical Genetics, Saitama Medical Center, Saitama Medical University, Saitama 350-8550, Japan
| | - Kiwamu Akagi
- Department of Molecular Diagnosis and Cancer Prevention, Saitama Cancer Center, Saitama 362-0806, Japan
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Mishima S, Naito Y, Akagi K, Hayashi N, Hirasawa A, Hishiki T, Igarashi A, Ikeda M, Kadowaki S, Kajiyama H, Kato M, Kenmotsu H, Kodera Y, Komine K, Koyama T, Maeda O, Miyachi M, Nishihara H, Nishiyama H, Ohga S, Okamoto W, Oki E, Ono S, Sanada M, Sekine I, Takano T, Tao K, Terashima K, Tsuchihara K, Yatabe Y, Yoshino T, Baba E. Japanese Society of Medical Oncology/Japan Society of Clinical Oncology/Japanese Society of Pediatric Hematology/Oncology-led clinical recommendations on the diagnosis and use of immunotherapy in patients with DNA mismatch repair deficient (dMMR) tumors, third edition. Int J Clin Oncol 2023; 28:1237-1258. [PMID: 37599324 PMCID: PMC10542286 DOI: 10.1007/s10147-023-02397-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2023] [Accepted: 07/28/2023] [Indexed: 08/22/2023]
Abstract
BACKGROUND Clinical trials have reported the efficacy of immune checkpoint inhibitors in the treatment of mismatch repair-deficient (dMMR) advanced solid tumors. The accumulated evidence of tumor agnostic agent has been made since PD-1 inhibitor was approved and used in clinical practice. Therefore, we have revised the guideline "Japan Society of Clinical Oncology provisional clinical opinion for the diagnosis and use of immunotherapy in patients with deficient DNA mismatch repair tumors, cooperated by Japanese Society of Medical Oncology, First Edition". METHODS Clinical questions regarding medical care were formulated for patients with dMMR advanced solid tumors. Relevant publications were searched by PubMed and Cochrane Database. Critical publications and conference reports were added manually. Systematic reviews were performed for each clinical question for the purpose of developing clinical recommendations. The committee members identified by Japan Society of Clinical Oncology (JSCO), Japanese Society of Medical Oncology (JSMO), and Japanese society of pediatric hematology/oncology (JSPHO) voted to determine the level of each recommendation considering the strength of evidence, expected risks and benefits to patients, and other related factors. Thereafter, a peer review by experts nominated from JSCO, JSMO, and JSPHO and the public comments among all societies' members were done. RESULTS The current guideline describes two clinical questions and eight recommendations for whom, when, and how MMR status should be tested. CONCLUSION In this guideline, the committee proposed eight recommendations for performing MMR testing properly to select patients who are likely to benefit from immunotherapy.
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Affiliation(s)
- Saori Mishima
- National Cancer Center Hospital East, Kashiwa, Japan
| | - Yoichi Naito
- National Cancer Center Hospital East, Kashiwa, Japan
| | | | - Naomi Hayashi
- The Cancer Institute Hospital of Japanese Foundation for Cancer Research, Tokyo, Japan
| | | | | | - Ataru Igarashi
- Yokohama City University School of Medicine, Yokohama, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Eiji Oki
- Kyushu University, Fukuoka, Japan
| | | | - Masashi Sanada
- National Hospital Organization Nagoya Medical Center, Aichi, Japan
| | | | | | - Kayoko Tao
- National Cancer Center Hospital, Tokyo, Japan
| | - Keita Terashima
- National Center for Child Health and Development, Tokyo, Japan
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Miyamoto Y, Ogawa K, Ohuchi M, Tokunaga R, Baba H. Emerging evidence of immunotherapy for colorectal cancer. Ann Gastroenterol Surg 2023; 7:216-224. [PMID: 36998297 PMCID: PMC10043776 DOI: 10.1002/ags3.12633] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Accepted: 10/13/2022] [Indexed: 11/10/2022] Open
Abstract
Since the advent of immune checkpoint inhibitors, which modulate the interplay between the tumor cell and immune system, immunotherapy has become widely recognized as a new standard treatment for cancers including microsatellite instability-high (MSI-H) colorectal cancer. Immune checkpoint inhibitors such as pembrolizumab and nivolumab (anti-PD-1 antibodies) that act in the effector phase of T cells and ipilimumab (anti-CTLA-4 antibody) that acts mainly in the priming phase are now in clinical use. These antibodies have shown therapeutic efficacy in MSI colorectal cancer patients who have failed to respond to existing standard therapies. Pembrolizumab is also strongly recommended as first-line therapy for MSI-H metastatic colorectal cancer. Therefore, the MSI status and tumor mutation burden of the tumor should be clarified before starting treatment. Because many patients do not respond to immune checkpoint inhibitors, combination therapies with immune checkpoint inhibitors, including chemotherapy, radiotherapy, or molecularly targeted agents, are being investigated. Furthermore, treatment methods for preoperative adjuvant therapy for rectal cancer are being developed.
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Affiliation(s)
- Yuji Miyamoto
- Department of Gastroenterological Surgery, Graduate School of Medical SciencesKumamoto UniversityKumamotoJapan
| | - Katsuhiro Ogawa
- Department of Gastroenterological Surgery, Graduate School of Medical SciencesKumamoto UniversityKumamotoJapan
| | - Mayuko Ohuchi
- Department of Gastroenterological Surgery, Graduate School of Medical SciencesKumamoto UniversityKumamotoJapan
| | - Ryuma Tokunaga
- Department of Gastroenterological Surgery, Graduate School of Medical SciencesKumamoto UniversityKumamotoJapan
| | - Hideo Baba
- Department of Gastroenterological Surgery, Graduate School of Medical SciencesKumamoto UniversityKumamotoJapan
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Qiu YY, Zeng YX, Cheng Y. Are High Levels of Microsatellite Instability and Microsatellite Stability Identical in DNA Mismatch Repair-Deficient Colorectal Cancer Patients? Can J Gastroenterol Hepatol 2023; 2023:8370262. [PMID: 36937571 PMCID: PMC10017221 DOI: 10.1155/2023/8370262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2022] [Revised: 01/11/2023] [Accepted: 02/24/2023] [Indexed: 03/21/2023] Open
Abstract
Purpose The purpose of the current study was to determine whether there is a difference between high levels of microsatellite instability (MSI-H) and microsatellite stability (MSS) in DNA mismatch repair-deficient (DMMR) colorectal cancer (CRC) patients. Methods A total of 452 CRC patients with DMMR from December, 2014, to April, 2021, in our hospital were selected retrospectively. However, only 105 patients underwent Sanger or next-generation-sequencing (NGS) to confirm their microsatellite status. Ultimately, 55 MSI-H patients and 20 MSS patients with intact medical record information were included in this study. Results The MSS group was associated with a higher mutation rate in the KRAS gene (P=0.011). Meanwhile, MSI-H was related to colon cancer (P < 0.01). However, no significant differences in other clinical characteristics were observed between the two groups of patients. There was no significant difference between the MSI-H and MSS groups in terms of overall survival (OS) (P=0.398) and disease-free survival (DFS) (P=0.307). Conclusion The MSI-H status was associated with colon cancer and a lower mutation rate of the KRAS gene in DMMR patients. In CRC-DMMR patients, the MSS group exhibited better OS and DFS than the MSI-H group, although these differences were not statistically significant. Accordingly, in clinical practice, we should not confuse these two types of patients.
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Affiliation(s)
- Yan-Yu Qiu
- 1Department of Gastrointestinal Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
| | - Yi-Xin Zeng
- 2Chinese Academy of Medical Sciences & Peking Union Medical College Institute of Medicinal Biotechnology, Beijing 100050, China
| | - Yong Cheng
- 1Department of Gastrointestinal Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
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Japanese Society for Cancer of the Colon and Rectum (JSCCR) guidelines 2020 for the Clinical Practice of Hereditary Colorectal Cancer. Int J Clin Oncol 2021; 26:1353-1419. [PMID: 34185173 PMCID: PMC8286959 DOI: 10.1007/s10147-021-01881-4] [Citation(s) in RCA: 54] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 01/10/2021] [Indexed: 12/14/2022]
Abstract
Hereditary colorectal cancer (HCRC) accounts for < 5% of all colorectal cancer cases. Some of the unique characteristics commonly encountered in HCRC cases include early age of onset, synchronous/metachronous cancer occurrence, and multiple cancers in other organs. These characteristics necessitate different management approaches, including diagnosis, treatment or surveillance, from sporadic colorectal cancer management. There are two representative HCRC, named familial adenomatous polyposis and Lynch syndrome. Other than these two HCRC syndromes, related disorders have also been reported. Several guidelines for hereditary disorders have already been published worldwide. In Japan, the first guideline for HCRC was prepared by the Japanese Society for Cancer of the Colon and Rectum (JSCCR), published in 2012 and revised in 2016. This revised version of the guideline was immediately translated into English and published in 2017. Since then, several new findings and novel disease concepts related to HCRC have been discovered. The currently diagnosed HCRC rate in daily clinical practice is relatively low; however, this is predicted to increase in the era of cancer genomic medicine, with the advancement of cancer multi-gene panel testing or whole genome testing, among others. Under these circumstances, the JSCCR guidelines 2020 for HCRC were prepared by consensus among members of the JSCCR HCRC Guideline Committee, based on a careful review of the evidence retrieved from literature searches, and considering the medical health insurance system and actual clinical practice settings in Japan. Herein, we present the English version of the JSCCR guidelines 2020 for HCRC.
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Wilson K, Flood M, Narasimhan V, Pham T, Warrier S, Ramsay R, Michael M, Heriot A. Complete pathological response in rectal cancer utilising novel treatment strategies for neo-adjuvant therapy: A systematic review. Eur J Surg Oncol 2021; 47:1862-1874. [PMID: 33814240 DOI: 10.1016/j.ejso.2021.03.245] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 02/07/2021] [Accepted: 03/17/2021] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Locally advanced rectal cancer is routinely treated with neo-adjuvant long course chemoradiotherapy or short course radiotherapy, followed by total mesorectal excision. Not all patients respond to this treatment and there has been an emergence of novel treatment strategies designed to improve outcomes for these patients. This systematic review aims to assess the current novel neo-adjuvant treatment strategies being utilised in the treatment of patients with rectal cancer and how these impact pathological complete response (pCR) rates. METHODS A systematic review of the literature was performed to evaluate pathological response in patients with rectal cancer receiving novel neo-adjuvant therapy. EMBASE and Medline electronic databases were searched for relevant articles. Articles published between January 2008 and February 2019 were retrieved. Included studies underwent critical appraisal and complete pathological response rates were recorded. RESULTS Of the initial 1074 articles identified, 217 articles fulfilled the inclusion criteria, of these 60 articles (4359 patients) were included. Neo-adjuvant therapy delivered included novel long course chemoradiation therapy, neoadjuvant chemotherapy alone, addition of a biological agent, total neo-adjuvant therapy, novel short course radiation therapy and studies utilising biomarkers to select patients for therapy. Complete pathological response rates ranged from 0 to 60%. CONCLUSION A validated novel neo-adjuvant therapy that significantly increases pCR rates in patients with rectal cancer has not been identified.
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Affiliation(s)
- K Wilson
- Peter MacCallum Cancer Centre, Department of Surgical Oncology, Australia; Differentiation and Transcription Laboratory, Sir Peter MacCallum Cancer Centre, Australia; Sir Peter MacCallum Dept. of Oncology, University of Melbourne, Australia.
| | - M Flood
- Peter MacCallum Cancer Centre, Department of Surgical Oncology, Australia; Differentiation and Transcription Laboratory, Sir Peter MacCallum Cancer Centre, Australia; Sir Peter MacCallum Dept. of Oncology, University of Melbourne, Australia
| | - V Narasimhan
- Peter MacCallum Cancer Centre, Department of Surgical Oncology, Australia; Differentiation and Transcription Laboratory, Sir Peter MacCallum Cancer Centre, Australia; Sir Peter MacCallum Dept. of Oncology, University of Melbourne, Australia
| | - T Pham
- Peter MacCallum Cancer Centre, Department of Surgical Oncology, Australia; Differentiation and Transcription Laboratory, Sir Peter MacCallum Cancer Centre, Australia; Sir Peter MacCallum Dept. of Oncology, University of Melbourne, Australia
| | - S Warrier
- Peter MacCallum Cancer Centre, Department of Surgical Oncology, Australia
| | - R Ramsay
- Peter MacCallum Cancer Centre, Department of Surgical Oncology, Australia; Differentiation and Transcription Laboratory, Sir Peter MacCallum Cancer Centre, Australia
| | - M Michael
- Peter MacCallum Cancer Centre, Department of Medical Oncology, Australia; Sir Peter MacCallum Dept. of Oncology, University of Melbourne, Australia
| | - A Heriot
- Peter MacCallum Cancer Centre, Department of Surgical Oncology, Australia; Sir Peter MacCallum Dept. of Oncology, University of Melbourne, Australia
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Ryan ÉJ, Creavin B, Sheahan K. Delivery of Personalized Care for Locally Advanced Rectal Cancer: Incorporating Pathological, Molecular Genetic, and Immunological Biomarkers Into the Multimodal Paradigm. Front Oncol 2020; 10:1369. [PMID: 32923389 PMCID: PMC7456909 DOI: 10.3389/fonc.2020.01369] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Accepted: 06/29/2020] [Indexed: 12/13/2022] Open
Abstract
Approximately one-third of all newly diagnosed colorectal cancer (CRC) is composed of rectal cancer, with the incidence rising in younger patients. The principal neoadjuvant treatments consist of neoadjuvant short-course radiotherapy and long-course chemoradiation. Locally advanced rectal cancer (LARC) is particularly challenging to manage given the anatomical constrictions of the pelvis and the risk for local recurrence. In appropriately treated patients, 5- and 10-year overall survival is estimated at 60 and 50%, respectively. The prognosis for LARC has improved in recent years with more access to screening, advances in surgical techniques, and perioperative care. Furthermore, the refinement of the multidisciplinary team with combined-modality management strategies has improved outcomes. These advancements have been augmented by significant improvements in the understanding of the underlying tumor biology. However, there are many instances where patient outcomes do not match those for their tumor stage and accurate prognostic information for individual patients can be difficult to estimate owing to the heterogeneous nature of LARC. Many new combinations of chemotherapy with radiotherapy, including total neoadjuvant therapy with targeted therapies that aim to diminish toxicity and increase survival, are being evaluated in clinical trials. Despite these advances, local recurrence and distant metastasis remain an issue, with one-third of LARC patients dying within 5 years of initial treatment. Although much of the new pathological, molecular genetics, and immunological biomarkers allow refinement in the classification and prognostication of CRC, the relative importance of each of these factors with regards to the development and progression of LARC remains incompletely understood. These factors are often insufficiently validated and seldom consider the individual characteristics of the host, the tumor and its location, the local available expertise, or the probable location of recurrence. Appreciating the mechanisms behind these differences will allow for a more comprehensive, personalized approach and more informed treatment options, leading to ultimately superior outcomes. This review aims to first outline the current multidisciplinary context in which LARC care should be delivered and then discuss how some key prognosticators, including novel histopathological, molecular genetics, and immunological biomarkers, might fit into the wider context of personalized LARC management in the coming years.
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Affiliation(s)
- Éanna J. Ryan
- School of Medicine, University College Dublin, Dublin, Ireland
- Department of Surgery, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Ben Creavin
- School of Medicine, University College Dublin, Dublin, Ireland
- Department of Surgery, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Kieran Sheahan
- School of Medicine, University College Dublin, Dublin, Ireland
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Sugiyama T, Iwaizumi M, Kaneko M, Tani S, Yamade M, Hamaya Y, Furuta T, Miyajima H, Osawa S, Baba S, Maekawa M, Sugimoto K. DNA mismatch repair is not disrupted in stage 0 colorectal cancer resected using endoscopic submucosal dissection. Oncol Lett 2020; 20:2435-2441. [PMID: 32782560 PMCID: PMC7399995 DOI: 10.3892/ol.2020.11799] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Accepted: 06/15/2020] [Indexed: 12/17/2022] Open
Abstract
The frequency of deficient mismatch repair (dMMR) or microsatellite instability-high colorectal cancer (CRC) is estimated to be ~15% of all patients with CRC; however, the patients reported are limited to surgical cases, and the frequency of patients exhibiting stage 0 disease is not considered, despite the currently increasing use of endoscopic techniques to cure a number of these patients. In the present study, the DNA MMR status for stage 0 patients with CRC treated using endoscopic submucosal dissection or endoscopic mucosal resection was analyzed via immunohistochemical staining of four types of proteins, namely MutL homolog 1 (MLH1), MutS homolog 2 (MSH2), MSH6 and PMS1 homolog 2 MMR system component, in adenocarcinoma specimens. Notably, none of the endoscopically resected specimens exhibited dMMR among the 41 patients diagnosed with stage 0 CRC. Since tumors harboring dMMR progress more rapidly than tumors with chromosomal instability, the present results highlight the importance of tumor resection during very early phases that exist before the promoter region of MLH1 becomes hypermethylated, resulting in a loss of DNA MMR function.
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Affiliation(s)
- Tomohiro Sugiyama
- First Department of Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan
| | - Moriya Iwaizumi
- Department of Laboratory Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan
| | - Masanao Kaneko
- First Department of Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan
| | - Shinya Tani
- First Department of Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan
| | - Mihoko Yamade
- First Department of Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan
| | - Yasushi Hamaya
- First Department of Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan
| | - Takahisa Furuta
- Center for Clinical Research, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan
| | - Hiroaki Miyajima
- First Department of Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan
| | - Satoshi Osawa
- Department of Endoscopic and Photodynamic Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan
| | - Satoshi Baba
- Department of Diagnostic Pathology, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan
| | - Masato Maekawa
- Department of Laboratory Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan
| | - Ken Sugimoto
- First Department of Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan
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Otsuka H, Murakami Y, Uemura K, Kondo N, Nakagawa N, Okada K, Seo S, Takahashi S. Immunohistological evaluation of mismatch repair deficiency in pancreatic ductal adenocarcinoma treated with surgical resection. JOURNAL OF HEPATO-BILIARY-PANCREATIC SCIENCES 2020; 27:421-428. [PMID: 32219999 DOI: 10.1002/jhbp.737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2019] [Revised: 03/16/2020] [Accepted: 03/18/2020] [Indexed: 11/06/2022]
Abstract
BACKGROUND The frequency and prognosis of resected deficient mismatch repair (dMMR) pancreatic ductal adenocarcinoma (PDAC) remain unclear. This study was designed to assess the frequency of dMMR and its clinicopathological relevance in Japanese patients with PDAC treated with surgical resection. METHODS A total of 400 consecutive patients with PDAC who underwent surgical resection at Hiroshima University were enrolled. Immunohistochemical staining with four antibodies including MLH1, MSH2, MSH6, and PMS2 was used to determine the presence of dMMR in PDAC specimens. Statistical analyses were applied to evaluate the frequency and clinical outcomes of these patients. RESULTS Of these 400 patients, five (1.3%) had dMMR (two had MLH1 deficiency, two had PMS2 deficiency, and one had MSH2 deficiency). We found a significantly different histological differentiation pattern between patients with dMMR and those with proficient mismatch repair (pMMR) (P = .03). Univariate survival analysis revealed no significant differences between dMMR and pMMR in recurrence-free survival (P = .268) or overall survival (P = .173). CONCLUSIONS The incidence of dMMR in Japanese patients with resected PDAC is low, and we found no ethnic-specific differences when comparing the incidence to that in Caucasian patients. In the current study, no significant difference was found in recurrence-free and overall survival between patients with dMMR and pMMR.
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Affiliation(s)
- Hiroyuki Otsuka
- Department of Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Yoshiaki Murakami
- Department of Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Kenichiro Uemura
- Department of Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Naru Kondo
- Department of Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Naoya Nakagawa
- Department of Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Kenjiro Okada
- Department of Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Shingo Seo
- Department of Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Shinya Takahashi
- Department of Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
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Chikatani K, Chika N, Suzuki O, Sakimoto T, Ishibashi K, Eguchi H, Okazaki Y, Ishida H. Clinically applicable cases of anti-programmed cell death protein 1 immunotherapy for colorectal cancer patients. Surg Today 2020; 50:1694-1698. [PMID: 32253514 DOI: 10.1007/s00595-020-01998-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 03/17/2020] [Indexed: 01/07/2023]
Abstract
We investigated the prevalence and characteristics of defective mismatch repair (dMMR) in colorectal cancer (CRC) patients who would potentially benefit from anti-programmed cell death protein 1 (PD-1) immunotherapy. Medical records were obtained and reviewed for 1147 patients who underwent surgical resection of stage I-IV CRC, in whom universal screening for Lynch syndrome using immunohistochemistry for MMR proteins had been undertaken. The molecular characteristics of dMMR CRCs were also investigated. Defective MMR accounted for 5.2% of stage I-IV CRC patients, including 12 (1.0% of all CRC patients) who had stage IV disease or recurrence after curative resection (n = 6 each). These 12 patients included patients with LS (n = 3) and Lynch-like syndrome (n = 1). Defective MMR tumors were predominantly located in the right-sided colon (P < 0.01). Approximately 1% of stage I-IV CRC patients could potentially benefit from anti-PD-1 immunotherapy, while one-third would require genetic counseling and/or MMR gene testing.
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Affiliation(s)
- Kenichi Chikatani
- Department of Digestive Tract and General Surgery, Saitama Medical Center, Saitama Medical University, 1981 Kamoda, Kawagoe, Saitama, 350-8550, Japan.
| | - Noriyasu Chika
- Department of Digestive Tract and General Surgery, Saitama Medical Center, Saitama Medical University, 1981 Kamoda, Kawagoe, Saitama, 350-8550, Japan
| | - Okihide Suzuki
- Department of Digestive Tract and General Surgery, Saitama Medical Center, Saitama Medical University, 1981 Kamoda, Kawagoe, Saitama, 350-8550, Japan
| | - Takehiko Sakimoto
- Department of Digestive Tract and General Surgery, Saitama Medical Center, Saitama Medical University, 1981 Kamoda, Kawagoe, Saitama, 350-8550, Japan
| | - Keiichiro Ishibashi
- Department of Digestive Tract and General Surgery, Saitama Medical Center, Saitama Medical University, 1981 Kamoda, Kawagoe, Saitama, 350-8550, Japan
| | - Hidetaka Eguchi
- Diagnostics and Therapeutics of Intractable Diseases, Intractable Disease Research Center, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Yasushi Okazaki
- Diagnostics and Therapeutics of Intractable Diseases, Intractable Disease Research Center, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Hideyuki Ishida
- Department of Digestive Tract and General Surgery, Saitama Medical Center, Saitama Medical University, 1981 Kamoda, Kawagoe, Saitama, 350-8550, Japan
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11
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Fujimoto A, Fujita M, Hasegawa T, Wong JH, Maejima K, Oku-Sasaki A, Nakano K, Shiraishi Y, Miyano S, Yamamoto G, Akagi K, Imoto S, Nakagawa H. Comprehensive analysis of indels in whole-genome microsatellite regions and microsatellite instability across 21 cancer types. Genome Res 2020; 30:gr.255026.119. [PMID: 32209592 PMCID: PMC7111525 DOI: 10.1101/gr.255026.119] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Accepted: 02/25/2020] [Indexed: 01/08/2023]
Abstract
Microsatellites are repeats of 1- to 6-bp units, and approximately 10 million microsatellites have been identified across the human genome. Microsatellites are vulnerable to DNA mismatch errors and have thus been used to detect cancers with mismatch repair deficiency. To reveal the mutational landscape of microsatellite repeat regions at the genome level, we analyzed approximately 20.1 billion microsatellites in 2717 whole genomes of pan-cancer samples across 21 tissue types. First, we developed a new insertion and deletion caller (MIMcall) that takes into consideration the error patterns of different types of microsatellites. Among the 2717 pan-cancer samples, our analysis identified 31 samples, including colorectal, uterus, and stomach cancers, with a higher proportion of mutated microsatellite (≥0.03), which we defined as microsatellite instability (MSI) cancers of genome-wide level. Next, we found 20 highly mutated microsatellites that can be used to detect MSI cancers with high sensitivity. Third, we found that replication timing and DNA shape were significantly associated with mutation rates of microsatellites. Last, analysis of mutations in mismatch repair genes showed that somatic SNVs and short indels had larger functional impacts than germline mutations and structural variations. Our analysis provides a comprehensive picture of mutations in the microsatellite regions and reveals possible causes of mutations, as well as provides a useful marker set for MSI detection.
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Affiliation(s)
- Akihiro Fujimoto
- Laboratory for Cancer Genomics, RIKEN Center for Integrative Medical Sciences, Tokyo 230-0045, Japan
- Department of Human Genetics, The University of Tokyo, Graduate School of Medicine, Tokyo 113-0033, Japan
- Department of Drug Discovery Medicine, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
| | - Masashi Fujita
- Laboratory for Cancer Genomics, RIKEN Center for Integrative Medical Sciences, Tokyo 230-0045, Japan
| | - Takanori Hasegawa
- Health Intelligence Center, Institute of Medical Sciences, The University of Tokyo, Tokyo 108-8639, Japan
| | - Jing Hao Wong
- Department of Human Genetics, The University of Tokyo, Graduate School of Medicine, Tokyo 113-0033, Japan
- Department of Drug Discovery Medicine, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
| | - Kazuhiro Maejima
- Laboratory for Cancer Genomics, RIKEN Center for Integrative Medical Sciences, Tokyo 230-0045, Japan
| | - Aya Oku-Sasaki
- Laboratory for Cancer Genomics, RIKEN Center for Integrative Medical Sciences, Tokyo 230-0045, Japan
| | - Kaoru Nakano
- Laboratory for Cancer Genomics, RIKEN Center for Integrative Medical Sciences, Tokyo 230-0045, Japan
| | - Yuichi Shiraishi
- Division of Cellular Signaling, National Cancer Center Research Institute, Tokyo 104-0045, Japan
- Human Genome Center, Institute of Medical Sciences, The University of Tokyo, Tokyo 108-8639, Japan
| | - Satoru Miyano
- Health Intelligence Center, Institute of Medical Sciences, The University of Tokyo, Tokyo 108-8639, Japan
- Human Genome Center, Institute of Medical Sciences, The University of Tokyo, Tokyo 108-8639, Japan
| | - Go Yamamoto
- Division of Molecular Diagnosis and Cancer Prevention, Saitama Cancer Center, Saitama 362-0806, Japan
| | - Kiwamu Akagi
- Division of Molecular Diagnosis and Cancer Prevention, Saitama Cancer Center, Saitama 362-0806, Japan
| | - Seiya Imoto
- Health Intelligence Center, Institute of Medical Sciences, The University of Tokyo, Tokyo 108-8639, Japan
| | - Hidewaki Nakagawa
- Laboratory for Cancer Genomics, RIKEN Center for Integrative Medical Sciences, Tokyo 230-0045, Japan
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Chiaravalli A, Carnevali I, Sahnane N, Leoni E, Furlan D, Berselli M, Sessa F, Tibiletti M. Universal screening to identify Lynch syndrome: two years of experience in a Northern Italian Center. Eur J Cancer Prev 2019; 29:281-288. [DOI: 10.1097/cej.0000000000000543] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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13
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Japan Society of Clinical Oncology provisional clinical opinion for the diagnosis and use of immunotherapy in patients with deficient DNA mismatch repair tumors, cooperated by Japanese Society of Medical Oncology, First Edition. Int J Clin Oncol 2019; 25:217-239. [PMID: 31286289 PMCID: PMC6989445 DOI: 10.1007/s10147-019-01498-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Accepted: 06/16/2019] [Indexed: 01/05/2023]
Abstract
Background Novel therapeutic agents have improved survival outcomes in patients with advanced solid tumors. In parallel, the development of predictive biomarkers to identify patients who are likely to benefit from a certain treatment has also contributed to the improvement of survival. Recently, clinical trials have reported the efficacy of immune checkpoint inhibitors in the treatment of mismatch repair-deficient (dMMR) advanced solid tumors. In Japan, a PD-1 inhibitor for dMMR advanced solid tumors, regardless of the primary tumor site, has been approved. However, there are some issues related to administering immune checkpoint inhibitors in the clinical practice setting, making it necessary to develop the guidelines. Methods Clinical questions (CQs) regarding medical care were formulated for patients with dMMR advanced solid tumors, and evidence to the CQs was collected by manual search to prepare recommendations. Then, the committee members voted to determine the level of each recommendation considering the strength of evidence, expected risks and benefits to patients, and other factors. Results The current guideline, which we consider a provisional clinical opinion at this point, describes the 11 requirements to be considered in terms of patients for whom dMMR testing is recommended, the timing and methods of dMMR testing, and clinical care systems required to perform dMMR testing properly and to administer immune checkpoint inhibitors safely. Conclusion This provisional clinical opinion proposes the requirements for performing dMMR testing properly to select patients who are likely to benefit from immune checkpoint inhibitors and administering them safely. Electronic supplementary material The online version of this article (10.1007/s10147-019-01498-8) contains supplementary material, which is available to authorized users.
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Distinct Prognosis of High Versus Mid/Low Rectal Cancer: a Propensity Score-Matched Cohort Study. J Gastrointest Surg 2019; 23:1474-1484. [PMID: 30617772 DOI: 10.1007/s11605-018-04072-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2018] [Accepted: 11/27/2018] [Indexed: 02/07/2023]
Abstract
BACKGROUND Rectal cancers have long been treated as a single-entity disease; however, whether the prognosis of high rectal cancer (inferior margin located 10.1 to 15.0 cm from the anal verge) differs from that of mid/low rectal cancer (0 to 10.0 cm) remains disputed. METHODS Patients with stages I-III rectal adenocarcinomas undergoing curative-intent surgery were enrolled between 2007 and 2013 in this retrospective analysis. Exclusion criteria were neoadjuvant therapy or concurrent cancers. Propensity score matching and Cox regression analysis were performed to compare a 5-year overall and cancer-specific survival between patients with high and mid/low rectal cancer. RESULTS Of 613 patients who met the inclusion criteria, 199 (32.5%) and 414 (67.5%) had high and mid/low rectal cancer, respectively. After propensity score matching (187 cases for each group), the high group showed a better overall survival (70.9 vs. 56.9%, p = 0.042) and cancer-specific survival (77.4 vs. 60.3%, p = 0.028) at 5 years compared with the mid/low group with stage III disease. However, high rectal cancer did not demonstrate prognostic superiority in stages I-II disease. Multivariate analysis identified high tumor location as an independent prognostic factor for cancer-specific survival (hazards ratio = 0.422, 95% confidence interval 0.226-0.786, p = 0.007) and overall survival (hazards ratio = 0.613, 95% confidence interval 0.379-0.991, p = 0.046). CONCLUSIONS Patients with stage III high rectal adenocarcinoma demonstrated better overall and cancer-specific survival than those with mid/low type, and tumor location was an independent prognostic factor for patients with rectal carcinomas.
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Oh CR, Kim JE, Kang J, Kim SY, Kim KP, Hong YS, Lim SB, Yu CS, Kim JC, Kim J, Jang SJ, Kim TW. Prognostic Value of the Microsatellite Instability Status in Patients With Stage II/III Rectal Cancer Following Upfront Surgery. Clin Colorectal Cancer 2018; 17:e679-e685. [PMID: 30077598 DOI: 10.1016/j.clcc.2018.07.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Accepted: 07/05/2018] [Indexed: 02/07/2023]
Abstract
BACKGROUND We investigated whether the microsatellite instability (MSI) status affects the survival outcomes in patients with stage II/III rectal cancer who have undergone an upfront curative resection. PATIENTS AND METHODS A total of 1103 patients with curatively resected stage II/III rectal cancer who had available polymerase chain reaction-based MSI results were included in the final analysis. RESULTS Twenty-four (2.2%) patients in the total cohort were found to be MSI-high (MSI-H). In univariate analysis, neither disease-free survival (DFS) nor overall survival (OS) demonstrated significant differences between patients with MSI-H tumors and those with MSI-low (MSI-L) or microsatellite stable (MSS) tumors. The 5-year DFS rate was 78.0% in MSI-H patients and 69.9% in MSI-L/MSS patients (hazard ratio [HR], 0.84; 95% confidence interval [CI], 0.35-2.02; P = .689). The 5-year OS rates for MSI-H and MSI-L/MSS patients were 84.0% and 83.1%, respectively (HR, 0.86; 95% CI, 0.27-2.69; P = .790). By multivariate analysis, the MSI status did not affect either the DFS (HR, 1.00; 95% CI, 0.40-2.47; P = .994) or OS (HR, 0.85; 95% CI, 0.26-2.73; P = .778). CONCLUSIONS MSI-H tumors are rarely observed in rectal adenocarcinoma, and the MSI status may not affect the survival outcome in patients with a resected rectal cancer.
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Affiliation(s)
- Chung Ryul Oh
- Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center, Songpa-gu, Seoul, Korea; Department of Oncology, University of Ulsan College of Medicine, Asan Medical Center, Songpa-gu, Seoul, Korea
| | - Jeong Eun Kim
- Department of Oncology, University of Ulsan College of Medicine, Asan Medical Center, Songpa-gu, Seoul, Korea
| | - Jihoon Kang
- Department of Oncology, University of Ulsan College of Medicine, Asan Medical Center, Songpa-gu, Seoul, Korea
| | - Sun Young Kim
- Department of Oncology, University of Ulsan College of Medicine, Asan Medical Center, Songpa-gu, Seoul, Korea
| | - Kyu-Pyo Kim
- Department of Oncology, University of Ulsan College of Medicine, Asan Medical Center, Songpa-gu, Seoul, Korea
| | - Yong Sang Hong
- Department of Oncology, University of Ulsan College of Medicine, Asan Medical Center, Songpa-gu, Seoul, Korea
| | - Seok-Byung Lim
- Department of Colorectal Surgery, University of Ulsan College of Medicine, Asan Medical Center, Songpa-gu, Seoul, Korea
| | - Chang Sik Yu
- Department of Colorectal Surgery, University of Ulsan College of Medicine, Asan Medical Center, Songpa-gu, Seoul, Korea
| | - Jin Cheon Kim
- Department of Colorectal Surgery, University of Ulsan College of Medicine, Asan Medical Center, Songpa-gu, Seoul, Korea
| | - Jihun Kim
- Department of Pathology, University of Ulsan College of Medicine, Asan Medical Center, Songpa-gu, Seoul, Korea
| | - Se Jin Jang
- Department of Pathology, University of Ulsan College of Medicine, Asan Medical Center, Songpa-gu, Seoul, Korea
| | - Tae Won Kim
- Department of Oncology, University of Ulsan College of Medicine, Asan Medical Center, Songpa-gu, Seoul, Korea.
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Ishida H, Yamaguchi T, Tanakaya K, Akagi K, Inoue Y, Kumamoto K, Shimodaira H, Sekine S, Tanaka T, Chino A, Tomita N, Nakajima T, Hasegawa H, Hinoi T, Hirasawa A, Miyakura Y, Murakami Y, Muro K, Ajioka Y, Hashiguchi Y, Ito Y, Saito Y, Hamaguchi T, Ishiguro M, Ishihara S, Kanemitsu Y, Kawano H, Kinugasa Y, Kokudo N, Murofushi K, Nakajima T, Oka S, Sakai Y, Tsuji A, Uehara K, Ueno H, Yamazaki K, Yoshida M, Yoshino T, Boku N, Fujimori T, Itabashi M, Koinuma N, Morita T, Nishimura G, Sakata Y, Shimada Y, Takahashi K, Tanaka S, Tsuruta O, Yamaguchi T, Sugihara K, Watanabe T. Japanese Society for Cancer of the Colon and Rectum (JSCCR) Guidelines 2016 for the Clinical Practice of Hereditary Colorectal Cancer (Translated Version). J Anus Rectum Colon 2018; 2:S1-S51. [PMID: 31773066 PMCID: PMC6849642 DOI: 10.23922/jarc.2017-028] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Accepted: 09/15/2017] [Indexed: 02/07/2023] Open
Abstract
Hereditary colorectal cancer accounts for less than 5% of all colorectal cancer cases. Some of the unique characteristics that are commonly encountered in cases of hereditary colorectal cancer include early age at onset, synchronous/metachronous occurrence of the cancer, and association with multiple cancers in other organs, necessitating different management from sporadic colorectal cancer. While the diagnosis of familial adenomatous polyposis might be easy because usually 100 or more adenomas that develop in the colonic mucosa are in this condition, Lynch syndrome, which is the most commonly associated disease with hereditary colorectal cancer, is often missed in daily medical practice because of its relatively poorly defined clinical characteristics. In addition, the disease concept and diagnostic criteria for Lynch syndrome, which was once called hereditary non-polyposis colorectal cancer, have changed over time with continual research, thereby possibly creating confusion in clinical practice. Under these circumstances, the JSCCR Guideline Committee has developed the "JSCCR Guidelines 2016 for the Clinical Practice of Hereditary Colorectal Cancer (HCRC)," to allow delivery of appropriate medical care in daily practice to patients with familial adenomatous polyposis, Lynch syndrome, or other related diseases. The JSCCR Guidelines 2016 for HCRC were prepared by consensus reached among members of the JSCCR Guideline Committee, based on a careful review of the evidence retrieved from literature searches, and considering the medical health insurance system and actual clinical practice settings in Japan. Herein, we present the English version of the JSCCR Guidelines 2016 for HCRC.
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Affiliation(s)
- Hideyuki Ishida
- Department of Digestive Tract and General Surgery, Saitama Medical Center, Saitma Medical University, Kawagoe, Japan
| | - Tatsuro Yamaguchi
- Department of Surgery, Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital, Tokyo, Japan
| | - Kohji Tanakaya
- Department of Surgery, Iwakuni Clinical Center, Iwakuni, Japan
| | - Kiwamu Akagi
- Department of Cancer Prevention and Molecular Genetics, Saitama Prefectural Cancer Center, Saitama, Japan
| | - Yasuhiro Inoue
- Department of Gastrointestinal and Pediatric Surgery, Division of Reparative Medicine, Institute of Life Sciences, Mie University Graduate School of Medicine, Tsu, Japan
| | - Kensuke Kumamoto
- Department of Coloproctology, Aizu Medical Center, Fukushima Medical University, Aizuwakamatsu, Japan
| | - Hideki Shimodaira
- Department of Clinical Oncology, Institute of Development, Aging and Cancer, Tohoku University, Sendai, Japan
| | - Shigeki Sekine
- Division of Pathology and Clinical Laboratories, National Cancer Center, Hospital, Tokyo, Japan
| | - Toshiaki Tanaka
- Department of Surgical Oncology, The Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Akiko Chino
- Division of Gastroenterology, The Cancer Institute Hospital, Japanese Foundation for Cancer Research, Tokyo, Japan
| | - Naohiro Tomita
- Department of Surgery, Hyogo College of Medicine, Nishinomiya, Japan
| | - Takeshi Nakajima
- Endoscopy Division/Department of Genetic Medicine and Service, National Cancer Center Hospital, Tokyo, Japan
| | | | - Takao Hinoi
- Department of Surgery, Institute for Clinical Research, National Hospital Organization Kure Medical Center and Chugoku Cancer Center, Kure, Japan
| | - Akira Hirasawa
- Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan
| | - Yasuyuki Miyakura
- Department of Surgery Saitama Medical Center, Jichi Medical University, Saitama, Japan
| | - Yoshie Murakami
- Department of Oncology Nursing, Faculty of Nursing, Toho University, Tokyo, Japan
| | - Kei Muro
- Department of Clinical Oncology, Aichi Cancer Center Hospital, Nagoya, Japan
| | - Yoichi Ajioka
- Division of Molecular and Diagnostic Pathology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
| | | | - Yoshinori Ito
- Department of Radiation Oncology, National Cancer Center Hospital, Tokyo, Japan
| | - Yutaka Saito
- Endoscopy Division, National Cancer Center Hospital, Tokyo, Japan
| | - Tetsuya Hamaguchi
- Division of Gastrointestinal Medical Oncology, National Cancer Center Hospital, Tokyo, Japan
| | - Megumi Ishiguro
- Department of Translational Oncology, Tokyo Medical and Dental University Graduate School, Tokyo, Japan
| | - Soichiro Ishihara
- Department of Surgical Oncology, The Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Yukihide Kanemitsu
- Colorectal Surgery Division, National Cancer Center Hospital, Tokyo, Japan
| | - Hiroshi Kawano
- Department of Gastroenterology, St. Mary's Hospital, Fukuoka, Japan
| | - Yusuke Kinugasa
- Department of Colon and Rectal Surgery, Shizuoka Cancer Center, Shizuoka, Japan
| | - Norihiro Kokudo
- Hepato-Pancreato-Biliary Surgery Division, Artificial Organ and Transplantation Division, Department of Surgery, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Keiko Murofushi
- Radiation Oncology Department, The Cancer Institute Hospital, Japanese Foundation for Cancer Research, Tokyo, Japan
| | - Takako Nakajima
- Department of Clinical Oncology, St. Marianna University School of Medicine, Kawasaki, Japan
| | - Shiro Oka
- Gastroenterology and Metabolism, Hiroshima University Hospital, Hiroshima, Japan
| | | | - Akihiko Tsuji
- Department of Clinical Oncology, Faculty of Medicine, Kagawa University, Takamatsu, Japan
| | - Keisuke Uehara
- Division of Surgical Oncology, Department of Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Hideki Ueno
- Department of Surgery, National Defense Medical College, Saitama, Japan
| | - Kentaro Yamazaki
- Division of Gastrointestinal Oncology, Shizuoka Cancer Center, Shizuoka, Japan
| | - Masahiro Yoshida
- Department of Hemodialysis and Surgery, Chemotherapy Research Institute, International University of Health and Welfare, Ichikawa, Japan
| | - Takayuki Yoshino
- Department of Gastroenterology and Gastrointestinal Oncology, National Cancer Center Hospital East, Chiba, Japan
| | - Narikazu Boku
- Division of Gastrointestinal Medical Oncology, National Cancer Center Hospital, Tokyo, Japan
| | | | - Michio Itabashi
- Department of Surgery, Institute of Gastroenterology, Tokyo Women's Medical University, Tokyo, Japan
| | - Nobuo Koinuma
- Department of Health Administration and Policy, Tohoku Medical and Pharmaceutical University, Sendai, Japan
| | - Takayuki Morita
- Department of Surgery, Cancer Center, Aomori Prefectural Central Hospital, Aomori, Japan
| | - Genichi Nishimura
- Department of Surgery, Japanese Red Cross Kanazawa Hospital, Ishikawa, Japan
| | - Yuh Sakata
- CEO, Misawa City Hospital, Misawa, Japan
| | - Yasuhiro Shimada
- Division of Clinical Oncology, Kochi Health Sciences Center, Kochi, Japan
| | - Keiichi Takahashi
- Department of Surgery, Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital, Tokyo, Japan
| | - Shinji Tanaka
- Department of Endoscopy, Hiroshima University Hospital, Hiroshima, Japan
| | - Osamu Tsuruta
- Division of GI Endoscopy, Kurume University School of Medicine, Fukuoka, Japan
| | - Toshiharu Yamaguchi
- Department of Gastroenterological Surgery, The Cancer Institute Hospital, Japanese Foundation for Cancer Research, Tokyo, Japan
| | | | - Toshiaki Watanabe
- Department of Surgical Oncology, The Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
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Tanakaya K. Current clinical topics of Lynch syndrome. Int J Clin Oncol 2018; 24:1013-1019. [DOI: 10.1007/s10147-018-1282-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Accepted: 04/17/2018] [Indexed: 01/02/2023]
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Hoffman SJ, Wu MLC. Phenotypic and genotypic differences in colorectal carcinoma among Caucasians, Asians, and Hispanics lack statistical significance. Pathol Res Pract 2018; 214:720-726. [PMID: 29650442 DOI: 10.1016/j.prp.2018.03.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2017] [Revised: 02/25/2018] [Accepted: 03/02/2018] [Indexed: 11/30/2022]
Abstract
Colorectal carcinoma (CRC) has been shown to have both genetic and environmental factors that can promote carcinoma development. Previous studies have found ethnic differences in the distribution of molecular phenotypes of CRC. Very little specific data exist regarding Hispanic CRC, and these data primarily focus on epidemiology or location of carcinoma. Our retrospective study analyzed 562 Caucasian, Asian, and Hispanic CRC patients at the UCI Medical Center from 2004 to 2012. The results showed that there were no statistically significant differences with respect to mean age, gender or site of carcinoma among the three ethnic groups. There were no statistically significant differences among the three ethnicities with respect to rates of MSI, mutated BRAF, and mutated KRAS. The Caucasian group had a non-significant higher rate of MSI (15%) and BRAF mutation (12%) than the Asian and Hispanic groups. Hispanics had a non-significant higher rate of KRAS mutation (59%) than Caucasians (38%) and Asians (37%). The results of this study demonstrated a higher rate of MSI and BRAF mutation in the Caucasian group and a higher rate of KRAS mutation in the Hispanic group, however differences were not statistically significant.
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Affiliation(s)
- Sara J Hoffman
- University of California, Irvine School of Medicine, Division of Genetic and Genomic Medicine, Department of Pediatrics, Irvine, CA, USA.
| | - Mark Li-Cheng Wu
- University of California, Irvine School of Medicine, Department of Pathology and Laboratory Medicine, Irvine, CA, USA
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Ostwal V, Pande NS, Engineer R, Saklani A, deSouza A, Ramadwar M, Sawant S, Mandavkar S, Shrirangwar S, Kataria P, Patil P, Shetty O, Ramaswamy A. Low prevalence of deficient mismatch repair (dMMR) protein in locally advanced rectal cancers (LARC) and treatment outcomes. J Gastrointest Oncol 2018; 10:19-29. [PMID: 30788155 DOI: 10.21037/jgo.2018.10.01] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Background The available evidence in locally advanced rectal cancer (LARC) suggests a low prevalence of deficient mismatch repair (dMMR) protein status, approximating 1-3%. Methods Patients with LARC who were offered long course chemoradiation (LCRT), as per institution protocol during the period of 1st January 2014 to 31st December 2015 at Tata Memorial Hospital (TMH) in Mumbai were evaluated for outcomes and assessment of MMR status. Results A total of 419 patients were evaluated for LARC in TMH, of whom 354 were treated with LCRT. Of these 354 patients, 296 were assessable for MMR status based on tissue adequacy for testing. Three patients (1.01%) has dMMR status, while the remaining 293 patients had proficient MMR status. A total of 240 patients (67.8%) underwent curative intent resections. With a median follow-up of 32 months, estimated 3-year recurrence free survival (RFS) and overall survival (OS) for the resected group was 63.5% and 85.2%, respectively, while 3-year event free survival and OS for the unresected cohort was 15.2% and 15.8%, respectively. Signet ring histology, higher ypT stage, involved margin status post resection, and delays (>1 week) in LCRT were associated with inferior OS on multivariate analysis. Conclusions In a large LARC cohort, a majority of tumors had proficient MMR status, suggesting that MSI as a biomarker may have limited applicability in the management of rectal cancers. Signet ring histology, CRM involvement post resection, higher ypT stage and interruptions in LCRT predicted for inferior OS.
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Affiliation(s)
- Vikas Ostwal
- Department of Medical Oncology, Tata Memorial Hospital, Mumbai, India
| | - Nikhil S Pande
- Department of Medical Oncology, Tata Memorial Hospital, Mumbai, India
| | - Reena Engineer
- Department of Radiation Oncology, Tata Memorial Hospital, Mumbai, India
| | - Avanish Saklani
- Department of Surgical Oncology, Tata Memorial Hospital, Mumbai, India
| | - Ashwin deSouza
- Department of Surgical Oncology, Tata Memorial Hospital, Mumbai, India
| | - Mukta Ramadwar
- Department of Pathology, Tata Memorial Hospital, Mumbai, India
| | - Suvarna Sawant
- Department of Pathology, Tata Memorial Hospital, Mumbai, India
| | - Sarika Mandavkar
- Department of Medical Oncology, Tata Memorial Hospital, Mumbai, India
| | | | - Pritam Kataria
- Department of Medical Oncology, Tata Memorial Hospital, Mumbai, India
| | - Prachi Patil
- Department of Medical Gastroenterology, Tata Memorial Hospital, Mumbai, India
| | - Omshree Shetty
- Scientific Officer 'D', Molecular Pathology, Tata Memorial Hospital, Mumbai, India
| | - Anant Ramaswamy
- Department of Medical Oncology, Tata Memorial Hospital, Mumbai, India
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The current value of determining the mismatch repair status of colorectal cancer: A rationale for routine testing. Crit Rev Oncol Hematol 2017; 116:38-57. [PMID: 28693799 DOI: 10.1016/j.critrevonc.2017.05.006] [Citation(s) in RCA: 79] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Revised: 03/02/2017] [Accepted: 05/15/2017] [Indexed: 02/08/2023] Open
Abstract
Colorectal Cancer (CRC) is the third most prevalent cancer in men and women. Up to 15% of CRCs display microsatellite instability (MSI). MSI is reflective of a deficient mismatch repair (MMR) system and is most commonly caused by hypermethylation of the MLH1 promoter. However, it may also be due to autosomal dominant constitutional mutations in DNA MMR, termed Lynch Syndrome. MSI may be diagnosed via polymerase chain reaction (PCR) or alternatively, immunohistochemistry (IHC) can identify MMR deficiency (dMMR). Many institutions now advocate universal tumor screening of CRC via either PCR for MSI or IHC for dMMR to guide Lynch Syndrome testing. The association of sporadic MSI with methylation of the MLH1 promoter and an activating BRAF mutation may offer further exclusion criteria for genetic testing. Aside from screening for Lynch syndrome, MMR testing is important because of its prognostic and therapeutic implications. Several studies have shown MSI CRCs exhibit different clinicopathological features and prognosis compared to microsatellite-stable (MSS) CRCs. For example, response to conventional chemotherapy has been reported to be less in MSI tumours. More recently, MSI tumours have been shown to be responsive to immune-checkpoint inhibition providing a novel therapeutic strategy. This provides a rationale for routine testing for MSI or dMMR in CRC.
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Chika N, Eguchi H, Kumamoto K, Suzuki O, Ishibashi K, Tachikawa T, Akagi K, Tamaru JI, Okazaki Y, Ishida H. Prevalence of Lynch syndrome and Lynch-like syndrome among patients with colorectal cancer in a Japanese hospital-based population. Jpn J Clin Oncol 2017; 47:108-117. [PMID: 27920101 DOI: 10.1093/jjco/hyw178] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Accepted: 11/29/2016] [Indexed: 02/06/2023] Open
Abstract
Objective We investigated the prevalence of Lynch syndrome and Lynch-like syndrome among Japanese colorectal cancer patients, as there have been no credible data from Japan. Methods Immunohistochemical analyses for mismatch repair proteins (MLH1, MSH2, MSH6 and PMS2) were carried out in surgically resected, formalin-fixed paraffin-embedded specimens obtained from 1,234 newly diagnosed colorectal cancer patients between March 2005 and April 2014. The presence/absence of the BRAF V600E mutation and hypermethylation of the MLH1 promoter was analyzed where necessary. Genetic testing was finally undertaken in patients suspected as having Lynch syndrome. Results By the universal screening approach with immunohistochemical analysis for mismatch repair proteins followed by analyses for the BRAF V600E mutation and MLH1 promoter methylation status, 11 (0.9%) of the 1,234 patients were identified as candidates for genetic testing. Out of the 11 patients, 9 (0.7%) were finally diagnosed as having Lynch syndrome; the responsible genes included MLH1 (n = 1), MSH2 (n = 4), EPCAM (n = 1) and MSH6 (n = 3). The remaining two patients (0.2%) were regarded as having Lynch-like syndrome, since biallelic somatic deletion of the relevant mismatch repair genes was detected in the absence of germline mismatch repair alterations. None of the cases was identified as having germline MLH1 epimutation. Conclusions The prevalence of Lynch syndrome among all newly diagnosed cases of colorectal cancer in Japan is in the same range as that recently reported by studies in Western population. The prevalence of Lynch-like syndrome seems to be extremely low.
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Affiliation(s)
- Noriyasu Chika
- Department of Digestive Tract and General Surgery, Saitama Medical Center, Saitama Medical University, Japan
| | - Hidetaka Eguchi
- Division of Translational Research, Research Center for Genomic Medicine, Saitama Medical University, Japan
| | - Kensuke Kumamoto
- Department of Digestive Tract and General Surgery, Saitama Medical Center, Saitama Medical University, Japan
| | - Okihide Suzuki
- Department of Digestive Tract and General Surgery, Saitama Medical Center, Saitama Medical University, Japan
| | - Keiichiro Ishibashi
- Department of Digestive Tract and General Surgery, Saitama Medical Center, Saitama Medical University, Japan
| | - Tetsuhiko Tachikawa
- Division of Molecular Diagnosis and Cancer Prevention, Saitama Cancer Center, Saitama, Japan
| | - Kiwamu Akagi
- Division of Molecular Diagnosis and Cancer Prevention, Saitama Cancer Center, Saitama, Japan
| | - Jun-Ichi Tamaru
- Department of Pathology, Saitama Medical Center, Saitama Medical University, Japan
| | - Yasushi Okazaki
- Division of Translational Research, Research Center for Genomic Medicine, Saitama Medical University, Japan
| | - Hideyuki Ishida
- Department of Digestive Tract and General Surgery, Saitama Medical Center, Saitama Medical University, Japan
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Oh BY, Huh JW, Park YA, Cho YB, Yun SH, Kim HC, Lee WY, Chun HK. Prognostic factors in sporadic colon cancer with high-level microsatellite instability. Surgery 2016; 159:1372-81. [PMID: 26775578 DOI: 10.1016/j.surg.2015.11.028] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Revised: 11/11/2015] [Accepted: 11/27/2015] [Indexed: 11/24/2022]
Abstract
BACKGROUND The microsatellite instability-high (MSI-H) phenotype of colon cancer has a good prognosis and limited response to chemotherapy. We aimed to investigate prognostic factors and oncologic outcomes in patients with MSI-H sporadic colon cancer. METHODS A total of 329 patients with MSI-H sporadic colon cancer who underwent radical surgery from January 2004 to December 2012 at a single institution were included. We analyzed prognostic factors and oncologic outcomes according to chemotherapy in these patients compared with patients with MSI-low/microsatellite stable colon cancer. RESULTS Among the 329 patients, 174 were male and 155 were female. The median age was 59 years. The population consisted of 220 patients with stage II, 97 with stage III, and 12 with stage IV disease. Old age and advanced stage were independent poor prognostic factors of overall survival (OS; P = .014 and P = .040, respectively) and advanced stage and presence of perineural invasion were independent poor prognostic factors of disease-free survival (DFS; P = .004 and P = .001, respectively). In addition, a greater number of poor prognostic factors were associated with worse survival (P < .001). Patients with stage II disease showed no differences in OS and DFS according to receiving or not receiving chemotherapy (P = .140 and P = .694, respectively). CONCLUSION Old age, advanced stage, and presence of perineural invasion were independent and poor prognostic factors in patients with MSI-H sporadic colon cancer. Survival rates of MSI-H colon cancer patients with stage II disease were not improved by adjuvant chemotherapy.
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Affiliation(s)
- Bo Young Oh
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Jung Wook Huh
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
| | - Yoon Ah Park
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Yong Beom Cho
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Seong Hyeon Yun
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Hee Cheol Kim
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Woo Yong Lee
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Ho-Kyung Chun
- Department of Surgery, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea
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Predictive and prognostic biomarkers for neoadjuvant chemoradiotherapy in locally advanced rectal cancer. Crit Rev Oncol Hematol 2015; 96:67-80. [PMID: 26032919 DOI: 10.1016/j.critrevonc.2015.05.003] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Revised: 03/03/2015] [Accepted: 05/05/2015] [Indexed: 02/08/2023] Open
Abstract
Locally advanced rectal cancer is regularly treated with trimodality therapy consisting of neoadjuvant chemoradiation, surgery and adjuvant chemotherapy. There is a need for biomarkers to assess treatment response, and aid in stratification of patient risk to adapt and personalise components of the therapy. Currently, pathological stage and tumour regression grade are used to assess response. Experimental markers include proteins involved in cell proliferation, apoptosis, angiogenesis, the epithelial to mesenchymal transition and microsatellite instability. As yet, no single marker is sufficiently robust to have clinical utility. Microarrays that screen a tumour for multiple promising candidate markers, gene expression and microRNA profiling will likely have higher yield and it is expected that a combination or panel of markers would prove most useful. Moving forward, utilising serial samples of circulating tumour cells or circulating nucleic acids can potentially allow us to demonstrate tumour heterogeneity, document mutational changes and subsequently measure treatment response.
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Kadowaki S, Kakuta M, Takahashi S, Takahashi A, Arai Y, Nishimura Y, Yatsuoka T, Ooki A, Yamaguchi K, Matsuo K, Muro K, Akagi K. Prognostic value of KRAS and BRAF mutations in curatively resected colorectal cancer. World J Gastroenterol 2015; 21:1275-1283. [PMID: 25632202 PMCID: PMC4306173 DOI: 10.3748/wjg.v21.i4.1275] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Revised: 09/09/2014] [Accepted: 10/15/2014] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate the prognostic role of KRAS and BRAF mutations after adjustment for microsatellite instability (MSI) status in Japanese colorectal cancer (CRC) population.
METHODS: We assessed KRAS and BRAF mutations and MSI status in 813 Japanese patients with curatively resected, stage I-III CRC and examined associations of these mutations with disease-free survival (DFS) and overall survival (OS) using uni- and multivariate Cox proportional hazards models.
RESULTS: KRAS and BRAF mutations were detected in 312 (38%) of 812 and 40 (5%) of 811 tumors, respectively. KRAS mutations occurred more frequently in females than in males (P = 0.02), while the presence of BRAF mutations was significantly associated with the female gender (P = 0.006), proximal tumor location (P < 0.001), mucinous or poorly differentiated histology (P < 0.001), and MSI-high tumors (P < 0.001). After adjusting for relevant variables, including MSI status, KRAS mutations were associated with poorer DFS (HR = 1.35; 95%CI: 1.03-1.75) and OS (HR = 1.46; 95%CI: 1.09-1.97). BRAF mutations were poor prognostic factors for DFS (HR = 2.20; 95%CI: 1.19-4.06) and OS (HR = 2.30; 95%CI: 1.15-4.71). Neither the BRAF by MSI interaction test nor the KRAS by MSI interaction test yielded statistically significant results for DFS and OS.
CONCLUSION: KRAS and BRAF mutations are associated with inferior survival, independent of MSI status, in Japanese patients with curatively resected CRC.
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Miwata T, Hiyama T, Quach DT, Le HM, Hua HNT, Oka S, Tanaka S, Arihiro K, Chayama K. Differences in K-ras and mitochondrial DNA mutations and microsatellite instability between colorectal cancers of Vietnamese and Japanese patients. BMC Gastroenterol 2014; 14:203. [PMID: 25433803 PMCID: PMC4254007 DOI: 10.1186/s12876-014-0203-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Accepted: 11/17/2014] [Indexed: 01/28/2023] Open
Abstract
Background The incidence of early-onset (under 50 years of age) colorectal cancer (CRC) in the Vietnamese has been reported to be quite higher than that in the Japanese. To clarify the differences in genetic alterations between Vietnamese and Japanese CRCs, we investigated mutations in K-ras and mitochondrial DNA (mtDNA) and high-frequency microsatellite instability (MSI-H) in the CRCs of Vietnamese and Japanese patients. Methods We enrolled 60 Vietnamese and 233 Japanese patients with invasive CRCs. DNA was extracted from formalin-fixed, paraffin-embedded tissue sections. K-ras mutations were examined with PCR-single-strand conformation polymorphism analysis. mtDNA mutations and MSI-H were examined with microsatellite analysis using D310 and BAT-26, respectively. Results K-ras mutations were examined in 60 Vietnamese and 45 Japanese CRCs. The frequency of the mutations in the Vietnamese CRCs was significantly higher than that in the Japanese CRCs (8 of 24 [33%] vs 5 of 45 [11%], p =0.048). MSI-H was examined in 60 Vietnamese and 130 Japanese CRCs. The frequency of MSI-H in the Vietnamese CRCs was also significantly higher than that in the Japanese CRCs (6 of 27 [22%] vs 10 of 130 [8%], p =0.030). mtDNA mutations were examined in 60 Vietnamese and 138 Japanese CRCs. The frequency of mtDNA mutations in the Vietnamese CRCs was significantly higher than that in the Japanese CRCs (19 of 44 [43%] vs 11 of 133 [9%], p <0.001). There were no significant differences in clinicopathologic characteristics, such as age, sex, tumour location, and depth, in terms of tumours with/without each genetic alteration in the CRCs of the Vietnamese and Japanese patients. Conclusions These results indicate that the developmental pathways of CRCs in the Vietnamese may differ from those of CRCs in the Japanese.
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Affiliation(s)
- Tomohiro Miwata
- Department of Gastroenterology and Metabolism, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan.
| | - Toru Hiyama
- Health Service Center, Hiroshima University, Higashihiroshima, Japan.
| | - Duc Trong Quach
- Department of Endoscopy, University Medical Center, Ho Chi Minh, Vietnam.
| | - Huy Minh Le
- Department of Pathology, University Medical Center, Ho Chi Minh, Vietnam.
| | - Ha Ngoc Thi Hua
- Department of Pathology, University Medical Center, Ho Chi Minh, Vietnam.
| | - Shiro Oka
- Department of Endoscopy, Hiroshima University Hospital, Hiroshima, Japan.
| | - Shinji Tanaka
- Department of Endoscopy, Hiroshima University Hospital, Hiroshima, Japan.
| | - Koji Arihiro
- Department of Pathology, Hiroshima University Hospital, Hiroshima, Japan.
| | - Kazuaki Chayama
- Department of Gastroenterology and Metabolism, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan.
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Haplotype defined by the MLH1-93G/A polymorphism is associated with MLH1 promoter hypermethylation in sporadic colorectal cancers. BMC Res Notes 2014; 7:835. [PMID: 25421847 PMCID: PMC4253604 DOI: 10.1186/1756-0500-7-835] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2013] [Accepted: 11/07/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Methylation of the MLH1 promoter region has been suggested to be a major mechanism of gene inactivation in sporadic microsatellite instability-positive (MSI-H) colorectal cancers (CRCs). Recently, single-nucleotide polymorphism (SNP) in the MLH1 promoter region (MLH1-93G/A; rs1800734) has been proposed to be associated with MLH1 promoter methylation, loss of MLH1 protein expression and MSI-H tumors. We examined the association of MLH1-93G/A and six other SNPs surrounding MLH1-93G/A with the methylation status in 210 consecutive sporadic CRCs in Japanese patients. METHODS Methylation of the MLH1 promoter region was evaluated by Na-bisulfite polymerase chain reaction (PCR)/single-strand conformation polymorphism (SSCP) analysis. The genotype frequencies of SNPs located in the 54-kb region surrounding the MLH1-93G/A SNP were examined by SSCP analysis. RESULTS Methylation of the MLH1 promoter region was observed in 28.6% (60/210) of sporadic CRCs. The proportions of MLH1-93G/A genotypes A/A, A/G and G/G were 26% (n=54), 51% (n=108) and 23% (n=48), respectively, and they were significantly associated with the methylation status (p=0.01). There were no significant associations between genotype frequency of the six other SNPs and methylation status. The A-allele of MLH1-93G/A was more common in cases with methylation than the G-allele (p=0.0094), especially in females (p=0.0067). In logistic regression, the A/A genotype of the MLH1-93G/A SNP was shown to be the most significant risk factor for methylation of the MLH1 promoter region (odds ratio 2.82, p=0.003). Furthermore, a haplotype of the A-allele of rs2276807 located -47 kb upstream from the MLH1-93G/A SNP and the A-allele of MLH1-93G/A SNP was significantly associated with MLH1 promoter methylation. CONCLUSIONS These results indicate that individuals, and particularly females, carrying the A-allele at the MLH1-93G/A SNP, especially in association with the A-allele of rs2276807, may harbor an increased risk of methylation of the MLH1 promoter region.
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Ooki A, Akagi K, Yatsuoka T, Asayama M, Hara H, Takahashi A, Kakuta M, Nishimura Y, Yamaguchi K. Combined microsatellite instability and BRAF gene status as biomarkers for adjuvant chemotherapy in stage III colorectal cancer. J Surg Oncol 2014; 110:982-8. [PMID: 25154726 DOI: 10.1002/jso.23755] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Accepted: 07/18/2014] [Indexed: 01/10/2023]
Abstract
BACKGROUND The clinical relevance of combined microsatellite instability (MSI) and BRAF status for adjuvant treatment in stage III colorectal cancer (CRC) remains elusive. METHODS In 405 patients with curatively resected stage III CRC, the prognostic value of combined MSI and BRAF status was assessed in four groups, as follows: high-levels of microsatellite instability (MSI-H) and BRAF-wild type, MSI-H and BRAF-mutation, microsatellite stable (MSS) and BRAF-wild type, and MSS and BRAF-mutation. RESULTS Combined MSI and BRAF status provided significant prognostic stratification of disease-free survival (DFS), and was independently associated with worse DFS. The MSI-H and BRAF-wild type group had similar outcomes to stage II CRC patients, despite no benefit from 5-FU monotherapy. Further, patients in the MSS and BRAF-wild type group with stage IIIA CRC had favorable outcomes to 5-FU monotherapy, similar to those with stage II CRC. In contrast, 5-FU monotherapy was insufficient among patients in the MSS and BRAF-wild type group with stage IIIB or IIIC CRC or patients in the MSS and BRAF-mutation group with stage III CRC. CONCLUSIONS The combination of MSI and BRAF status serves as both a prognostic and predictive marker and may provide much-needed guidance during the planning of therapeutic strategies.
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Affiliation(s)
- Akira Ooki
- Department of Gastroenterology, Saitama Cancer Center, Saitama, Japan
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Ogura T, Kakuta M, Yatsuoka T, Nishimura Y, Sakamoto H, Yamaguchi K, Tanabe M, Tanaka Y, Akagi K. Clinicopathological characteristics and prognostic impact of colorectal cancers with NRAS mutations. Oncol Rep 2014; 32:50-6. [PMID: 24806883 DOI: 10.3892/or.2014.3165] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2014] [Accepted: 03/22/2014] [Indexed: 12/25/2022] Open
Abstract
At present, molecular markers of colorectal cancer (CRC), including KRAS, NRAS and BRAF mutations, and the microsatellite status are evaluated for the development of personalized treatments. However, clinicopathological and molecular characteristics and the prognostic role of NRAS mutations remain unclear. In the present study, a total of 1,304 consecutive stage 0-IV CRC tumor samples were analyzed for KRAS (exon 2, 3 and 4), NRAS (exon 2 and 3) and BRAF (exon 15) mutations. Multivariate analysis was performed to assess the prognostic impact of NRAS mutations. KRAS, NRAS and BRAF mutations were identified in 553 (42.4%), 35 (2.7%), and 59 (4.5%) of 1,304 CRC cases, respectively. Tumors with NRAS mutations were more frequently located in the distal colorectum compared with those with KRAS or BRAF mutations. Multivariate analysis indicated that KRAS and BRAF mutations were found to be associated with poor prognosis [hazard ratio (HR)=1.44, 95% confidence interval (CI), 1.18-1.76 and HR=2.09; 95% CI, 1.33-3.28, respectively], whereas NRAS mutations were associated with a trend toward favorable prognosis (HR=0.53; 95% CI, 0.27-1.03). Characteristics and prognosis of CRC with NRAS mutations are different from those with KRAS or BRAF mutations.
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Affiliation(s)
- Toshiro Ogura
- Division of Gastroenterological Surgery, Saitama Cancer Center, Saitama 362-0806, Japan
| | - Miho Kakuta
- Division of Molecular Diagnosis and Cancer Prevention, Saitama Cancer Center, Saitama 362-0806, Japan
| | - Toshimasa Yatsuoka
- Division of Gastroenterological Surgery, Saitama Cancer Center, Saitama 362-0806, Japan
| | - Yoji Nishimura
- Division of Gastroenterological Surgery, Saitama Cancer Center, Saitama 362-0806, Japan
| | - Hirohiko Sakamoto
- Division of Gastroenterological Surgery, Saitama Cancer Center, Saitama 362-0806, Japan
| | - Kensei Yamaguchi
- Division of Gastroenterology, Saitama Cancer Center, Saitama 362-0806, Japan
| | - Minoru Tanabe
- Department of Hepato-Biliary-Pancreatic Surgery, Graduate School of Medicine, Tokyo Medical and Dental University, Tokyo 113-8519, Japan
| | - Yoichi Tanaka
- Division of Gastroenterological Surgery, Saitama Cancer Center, Saitama 362-0806, Japan
| | - Kiwamu Akagi
- Division of Molecular Diagnosis and Cancer Prevention, Saitama Cancer Center, Saitama 362-0806, Japan
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Demes M, Scheil-Bertram S, Bartsch H, Fisseler-Eckhoff A. Signature of microsatellite instability, KRAS and BRAF gene mutations in German patients with locally advanced rectal adenocarcinoma before and after neoadjuvant 5-FU radiochemotherapy. J Gastrointest Oncol 2013; 4:182-92. [PMID: 23730514 PMCID: PMC3635176 DOI: 10.3978/j.issn.2078-6891.2013.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2013] [Accepted: 02/26/2013] [Indexed: 01/16/2023] Open
Abstract
BACKGROUND Multiple activating mutations of the signal- and repair pathway, such as BRAF-, KRAS-mutations and microsatellite instabilities are involved in colorectal cancer pathogenesis. Molecular characterization of specifically locally advanced rectal cancers is scarce. Therefore the retrospective study addresses the intratumoral status of KRAS, BRAF and microsatellites loci with respect to tumor response and patients' antecedent including nicotine abusus, familial history, and health care to further molecularly identify rectal cancer patients. METHODS The study assesses the molecular status of 50 rectal cancer samples (25 before and 25 after neoadjuvant 5-FU radiochemotherapy). KRAS and BRAF mutations were examined through two independent analytical methods (sequencing and SNaPshot) to ensure efficient mutation detection. The microsatellite analysis was conducted using a fluorescent multiplex PCR-based method. RESULTS KRAS mutations were found in 9 of 25 (36%) rectal cancer patients and were not significantly associated with the response to therapy (P=0.577), age (P=0.249) or sex of the patient (P=0.566). No link exists between KRAS mutation status and nodal (P=0.371) or metastatic stage (P=0.216). For two patients, KRAS mutation status changed after application of neoadjuvant 5-FU radiochemotherapy. All tumor samples were diagnosed BRAF-negative. Two rectal cancer patients exhibited a MSI-H phenotype and showed no tumor response. CONCLUSIONS So one can conclude that (I) KRAS mutations status may change after neoadjuvant 5-FU radiochemotherapy relevant for further therapeutic decisions; (II) MSI-H patients do not respond to neoadjuvant 5-FU radiochemotherapy. Further prospective studies are needed to validate these results.
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Affiliation(s)
- Melanie Demes
- Department of Pathology and Cytology, Dr. Horst-Schmidt-Kliniken (HSK), Wiesbaden 65199, Germany
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Lin CC, Lai YL, Lin TC, Chen WS, Jiang JK, Yang SH, Wang HS, Lan YT, Liang WY, Hsu HM, Lin JK, Chang SC. Clinicopathologic features and prognostic analysis of MSI-high colon cancer. Int J Colorectal Dis 2012; 27:277-86. [PMID: 22076610 DOI: 10.1007/s00384-011-1341-2] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 10/20/2011] [Indexed: 02/04/2023]
Abstract
PURPOSE The objectives of the study were to estimate the incidence and clarify the clinicopathologic feature of sporadic microsatellite instability (MSI)-high (MSI-H) colon cancer. Furthermore, the role of MSI in colon cancer prognosis was also investigated. METHODS Microsatellite status was identified by genotyping. The clinicopathologic differences between two groups (MSI-H vs. MSI-L/S) and the prognostic value of MSI were analyzed. RESULTS From 1993 to 2006, 709 sporadic colon cancer patients were enrolled. MSI-H colon cancers showed significant association with poorly differentiated (28.3% vs. 7.2%, p = 0.001), proximally located (76.7% vs. 34.5%, p = 0.001), more high mucin-containing tumor (10.0% vs. 5.1%, p = 0.001) and female predominance (56.7% vs. 30.2%, p = 0.001). In multivariate analysis, MSI-H is an independent factor for better overall survival (HR, 0.459; 95% CI, 0.241-0.872, p = 0.017). CONCLUSIONS Based on the hospital-based study, MSI-H colon cancers demonstrated distinguished clinicopathologic features from MSI-L/S colon cancers. MSI-H is an independent favorable prognostic factor for overall survival in colon cancer.
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Affiliation(s)
- Chun-Chi Lin
- Division of Colon and Rectal Surgery, Department of Surgery, Taipei Veterans General Hospital, No. 201, Sec. 2, Shih-Pai Road, 11217, Taipei, Taiwan, Republic of China
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Markovic S, Antic J, Dragicevic N, Hamelin R, Krivokapic Z. High-frequency microsatellite instability and BRAF mutation (V600E) in unselected Serbian patients with colorectal cancer. J Mol Histol 2012; 43:137-43. [DOI: 10.1007/s10735-011-9387-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2011] [Accepted: 12/17/2011] [Indexed: 11/29/2022]
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Lin CH, Lin JK, Chang SC, Chang YH, Chang HM, Liu JH, Li LH, Chen YT, Tsai SF, Chen WS. Molecular profile and copy number analysis of sporadic colorectal cancer in Taiwan. J Biomed Sci 2011; 18:36. [PMID: 21645411 PMCID: PMC3123622 DOI: 10.1186/1423-0127-18-36] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2010] [Accepted: 06/07/2011] [Indexed: 02/06/2023] Open
Abstract
Background Colorectal cancer (CRC) is a major health concern worldwide, and recently becomes the most common cancer in Asia. The case collection of this study is one of the largest sets of CRC in Asia, and serves as representative data for investigating genomic differences between ethnic populations. We took comprehensive and high-resolution approaches to compare the clinicopathologic and genomic profiles of microsatellite instability (MSI) vs. microsatellite stability (MSS) in Taiwanese sporadic CRCs. Methods 1,173 CRC tumors were collected from the Taiwan population, and sequencing-based microsatellite typing assay was used to determine MSI and MSS. Genome-wide SNP array was used to detect CN alterations in 16 MSI-H and 13 MSS CRCs and CN variations in 424 general controls. Gene expression array was used to evaluate the effects of CN alterations, and quantitative PCR methods were used to replicate the findings in independent clinical samples. Results These 1,173 CRC tumors can be classified into 75 high-frequency MSI (MSI-H) (6.4%), 96 low-frequency MSI (8.2%) and 1,002 MSS (85.4%). Of the 75 MSI-H tumors, 22 had a BRAF mutation and 51 showed MLH1 promoter hypermethylation. There were distinctive differences in the extent of CN alterations between CRC MSS and MSI-H subtypes (300 Mb vs. 42 Mb per genome, p-value < 0.001). Also, chr7, 8q, 13 and 20 gains, and 8p and 18 losses were frequently found in MSS but not in MSI-H. Nearly a quarter of CN alterations were smaller than 100 kb, which might have been missed in previous studies due to low-resolution technology. 514 expressed genes showed CN differences between subtypes, and 271 of them (52%) were differentially expressed. Conclusions Sporadic CRCs with MSI-H displayed distinguishable clinicopathologic features, which differ from those of MSS. Genomic profiling of the two types of sporadic CRCs revealed significant differences in the extent and distribution of CN alterations in the cancer genome. More than half of expressed genes showing CN differences can directly contribute to their expressional diversities, and the biological functions of the genes associated with CN changes in sporadic CRCs warrant further investigation to establish their possible clinical implications.
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Affiliation(s)
- Chien-Hsing Lin
- Division of Molecular and Genomic Medicine, National Health Research Institutes, Zhunan, Taiwan
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Yamamoto S, Midorikawa Y, Morikawa T, Nishimura Y, Sakamoto H, Ishikawa S, Akagi K, Aburatani H. Identification of chromosomal aberrations of metastatic potential in colorectal carcinoma. Genes Chromosomes Cancer 2010; 49:487-96. [PMID: 20175194 DOI: 10.1002/gcc.20759] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
In colorectal cancer (CRC) care, treatment decisions depend on the efforts to estimate the metastatic potential of tumors. The liver is one of the most common metastatic sites of CRC and the prognosis of CRC patients often reflects metastases to distant sites. To identify chromosomal aberrations associated with liver metastasis, we performed allelic copy number analysis for CRC with or without synchronous liver metastasis using genotyping arrays. By allelic copy number analysis of CRC samples, we observed common aberrations in 14 chromosomal arms in two groups, that is, gains on 7p22.3-p11.2, 8q22.3-q24.3, 13q12.12-q34, and 20q11.22-q13.33 and loss of heterozygosity (LOH) on 4q12-q35.1, 5q11.2-q35.3, 8p23.3-p12, 15q11.2-q26.3, 17p13.3-p11.2, 17q11.2-q25.1, 18p11.32-p11.21, 18q11.2-q23, 20p13-p12.1, and 22q11.1-q13.32. We found that gains on 20p13-p12.1 and 20q11.21-q13.33 and LOH on 6q14.1-q25.1 were more frequent in CRC with liver metastasis. We also compared chromosomal aberrations in primary CRC lesions with those of the corresponding liver metastasis and found that the allelic genome imbalance status of a metastatic lesion is similar to that of the primary cancer, which suggests that chromosomal aberrations are largely maintained on hematogenous spread. Intriguingly, several chromosomal aberrations in CRC were found in the primary cancer but not in the corresponding liver metastasis, thus suggesting heterogeneity of cancer cells within solid tumors or the presence of events uniquely developed in primary tumors. Consequently, CRC with and without liver metastasis harbor similar chromosomal aberrations, and chromosomal aberration at 6q, 20p, and 20q may be involved in the process of liver metastasis of CRC.
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Affiliation(s)
- Shogo Yamamoto
- Genome Science Division, Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Tokyo, Japan
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Chang SC, Lin PC, Yang SH, Wang HS, Liang WY, Lin JK. Taiwan hospital-based detection of Lynch syndrome distinguishes 2 types of microsatellite instabilities in colorectal cancers. Surgery 2010; 147:720-8. [DOI: 10.1016/j.surg.2009.10.069] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2009] [Accepted: 10/30/2009] [Indexed: 11/27/2022]
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Yagi K, Akagi K, Hayashi H, Nagae G, Tsuji S, Isagawa T, Midorikawa Y, Nishimura Y, Sakamoto H, Seto Y, Aburatani H, Kaneda A. Three DNA methylation epigenotypes in human colorectal cancer. Clin Cancer Res 2009; 16:21-33. [PMID: 20028768 DOI: 10.1158/1078-0432.ccr-09-2006] [Citation(s) in RCA: 182] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
PURPOSE Whereas the CpG island methylator phenotype (CIMP) in colorectal cancer associates with microsatellite instability (MSI)-high and BRAF-mutation(+), the existence of an intermediate-methylation subgroup associated with KRAS-mutation(+) is controversial, and suitable markers for the subgroup have yet to be developed. Our aim is to clarify DNA methylation epigenotypes of colorectal cancer more comprehensively. EXPERIMENTAL DESIGN To select new methylation markers on a genome-wide scale, we did methylated DNA immunoprecipitation-on-chip analysis of colorectal cancer cell lines and re-expression array analysis by 5-aza-2'-deoxycytidine/Trichostatin A treatment. Methylation levels were analyzed quantitatively in 149 colorectal cancer samples using matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry. Colorectal cancer was epigenotyped by unsupervised two-way hierarchical clustering method. RESULTS Among 1,311 candidate silencing genes, 44 new markers were selected and underwent quantitative methylation analysis in colorectal cancer samples together with 16 previously reported markers. Colorectal cancer was clustered into high-, intermediate-, and low-methylation epigenotypes. Methylation markers were clustered into two major groups: group 1 showing methylation in high-methylation epigenotype, and group 2 showing methylation in high- and intermediate-methylation epigenotypes. A two-step marker panel deciding epigenotypes was developed with 95% accuracy: the 1st panel consisting of three group-1 markers (CACNA1G, LOX, SLC30A10) to extract high-methylation epigenotype, and the 2nd panel consisting of four group-2 markers (ELMO1, FBN2, THBD, HAND1) and SLC30A10 again to divide the remains into intermediate- and low-methylation epigenotypes. The high-methylation epigenotype correlated significantly with MSI-high and BRAF-mutation(+) in concordance with reported CIMP. Intermediate-epigenotype significantly correlated with KRAS-mutation(+). KRAS-mutation(+) colorectal cancer with intermediate-methylation epigenotype showed significantly worse prognosis. CONCLUSIONS Three methylation epigenotypes exist in colorectal cancer, and suitable classification markers have been developed. Intermediate-methylation epigenotype with KRAS-mutation(+) correlated with worse prognosis.
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Affiliation(s)
- Koichi Yagi
- Genome Science Division, Department of Gastrointestinal Surgery, Research Center for Advanced Science and Technology, Translational Systems Biology and Medicine Initiative, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
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Asaka SI, Arai Y, Nishimura Y, Yamaguchi K, Ishikubo T, Yatsuoka T, Tanaka Y, Akagi K. Microsatellite instability-low colorectal cancer acquires a KRAS mutation during the progression from Dukes' A to Dukes' B. Carcinogenesis 2009; 30:494-9. [PMID: 19147861 DOI: 10.1093/carcin/bgp017] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The classification of colorectal cancer (CRC) by microsatellite instability (MSI) status is important for effective clinical management. In fact, microsatellite instability-high (MSI-H) cancer has distinctive clinicopathological and molecular features. However, microsatellite instability-low (MSI-L) cancer is not clearly defined. The objective of this study was to further clarify the characteristics of MSI-L CRC. A consecutive series of 940 primary CRCs were subdivided into three groups according to the level of MSI and analyzed the clinicopathological features and genetic changes in the KRAS, BRAF and p53 mutation and the loss of heterozygosity (LOH) of adenomatous polyposis coli (APC) gene and methylation status of the O(6)-methylguanine-DNA methyltransferase (MGMT) and MLH1 promoter. Of the 940 CRCs, 5.9% were MSI-H, 7.1% were MSI-L and 87% were microsatellite stable (MSS). KRAS and BRAF mutations were detected in 39.4 and 4.6% of the CRCs, respectively. The frequency of KRAS mutations in MSI-H, MSI-L and MSS cancer was 30, 48 and 39%, respectively. The proportion of KRAS mutations in MSI-L cancer increased from 16 to 63% accompanying the progression from Dukes' A to Dukes' B. While the LOH of D5S346, which is located near the APC gene, and p53 mutation was observed in 75 and 67% of MSI-L CRC at Dukes' A, respectively. These results indicated that the LOH of APC and p53 mutation has already occurred by the Dukes' A lake 'suppressor pathway' but not the KRAS mutation in MSI-L CRCs. The genes involving MSI-L carcinogenesis are similar to MSS but the timing and frequency of the KRAS mutation is different.
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Affiliation(s)
- Shin-ichi Asaka
- Division of Molecular Diagnosis and Cancer Prevention, , SaitamaCancer Center, Kitaadati-gun, Saitama, Japan
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Payne S. Not an equal opportunity disease – a sex and gender-based review of colorectal cancer in men and women: Part I. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.jmhg.2007.03.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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