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Li MY, Liu YH, Wei F, Zhang P, Sun XD, Wang M, Du XH, Ye JF, Qiu W, Shi XJ, Ji B, Wang YC, Jiang C, Chai WG, Huang B, Liu XK, Chen QM, Fu Y, Hu XT, Chen LG, He JX, Chai KY, Gou ZM, Yang T, Wang GY, Jiang YF, Fan ZQ, Lv GY. Identification of prognostic biomarkers for cholangiocarcinoma by combined analysis of molecular characteristics of clinical MVI subtypes and molecular subtypes. Genomics 2024; 116:110889. [PMID: 38901654 DOI: 10.1016/j.ygeno.2024.110889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2024] [Revised: 05/27/2024] [Accepted: 06/15/2024] [Indexed: 06/22/2024]
Abstract
Cholangiocarcinoma (CCA) is widely noted for its high degree of malignancy, rapid progression, and limited therapeutic options. This study was carried out on transcriptome data of 417 CCA samples from different anatomical locations. The effects of lipid metabolism related genes and immune related genes as CCA classifiers were compared. Key genes were derived from MVI subtypes and better molecular subtypes. Pathways such as epithelial mesenchymal transition (EMT) and cell cycle were significantly activated in MVI-positive group. CCA patients were classified into three (four) subtypes based on lipid metabolism (immune) related genes, with better prognosis observed in lipid metabolism-C1, immune-C2, and immune-C4. IPTW analysis found that the prognosis of lipid metabolism-C1 was significantly better than that of lipid metabolism-C2 + C3 before and after correction. KRT16 was finally selected as the key gene. And knockdown of KRT16 inhibited proliferation, migration and invasion of CCA cells.
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Affiliation(s)
- Ming-Yue Li
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, First Hospital of Jilin University, Changchun, Jilin, China
| | - Ya-Hui Liu
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, First Hospital of Jilin University, Changchun, Jilin, China
| | - Feng Wei
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, First Hospital of Jilin University, Changchun, Jilin, China
| | - Ping Zhang
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, First Hospital of Jilin University, Changchun, Jilin, China
| | - Xiao-Dong Sun
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, First Hospital of Jilin University, Changchun, Jilin, China
| | - Meng Wang
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, First Hospital of Jilin University, Changchun, Jilin, China
| | - Xiao-Hong Du
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, First Hospital of Jilin University, Changchun, Jilin, China
| | - Jun-Feng Ye
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, First Hospital of Jilin University, Changchun, Jilin, China
| | - Wei Qiu
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, First Hospital of Jilin University, Changchun, Jilin, China
| | - Xiao-Ju Shi
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, First Hospital of Jilin University, Changchun, Jilin, China
| | - Bai Ji
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, First Hospital of Jilin University, Changchun, Jilin, China
| | - Ying-Chao Wang
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, First Hospital of Jilin University, Changchun, Jilin, China
| | - Chao Jiang
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, First Hospital of Jilin University, Changchun, Jilin, China
| | - Wen-Gang Chai
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, First Hospital of Jilin University, Changchun, Jilin, China
| | - Bo Huang
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, First Hospital of Jilin University, Changchun, Jilin, China
| | - Xing-Kai Liu
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, First Hospital of Jilin University, Changchun, Jilin, China
| | - Qing-Min Chen
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, First Hospital of Jilin University, Changchun, Jilin, China
| | - Yu Fu
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, First Hospital of Jilin University, Changchun, Jilin, China
| | - Xin-Tong Hu
- Key Laboratory of Organ Regeneration and Transplantation of the Ministry of Education, Genetic Diagnosis Center, First Hospital of Jilin University, Changchun, Jilin, China
| | - Li-Guo Chen
- Key Laboratory of Organ Regeneration and Transplantation of the Ministry of Education, Genetic Diagnosis Center, First Hospital of Jilin University, Changchun, Jilin, China
| | - Jia-Xue He
- Key Laboratory of Organ Regeneration and Transplantation of the Ministry of Education, Genetic Diagnosis Center, First Hospital of Jilin University, Changchun, Jilin, China
| | - Kai-Yuan Chai
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, First Hospital of Jilin University, Changchun, Jilin, China
| | - Zhao-Ming Gou
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, First Hospital of Jilin University, Changchun, Jilin, China
| | - Tian Yang
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, First Hospital of Jilin University, Changchun, Jilin, China; Department of Hepatobiliary Surgery, Eastern Hepatobiliary Surgery Hospital, Second Military Medical University (Navy Medical University), Shanghai, China
| | - Guang-Yi Wang
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, First Hospital of Jilin University, Changchun, Jilin, China
| | - Yan-Fang Jiang
- Key Laboratory of Organ Regeneration and Transplantation of the Ministry of Education, Genetic Diagnosis Center, First Hospital of Jilin University, Changchun, Jilin, China.
| | - Zhong-Qi Fan
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, First Hospital of Jilin University, Changchun, Jilin, China.
| | - Guo-Yue Lv
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, First Hospital of Jilin University, Changchun, Jilin, China.
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Tchilikidi KY. Ex vivo liver resection and auto-transplantation and special systemic therapy in perihilar cholangiocarcinoma treatment. World J Gastrointest Surg 2024; 16:635-640. [PMID: 38577079 PMCID: PMC10989340 DOI: 10.4240/wjgs.v16.i3.635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Revised: 12/26/2023] [Accepted: 02/18/2024] [Indexed: 03/22/2024] Open
Abstract
This editorial contains comments on the article "Systematic sequential therapy for ex vivo liver resection and autotransplantation: A case report and review of literature" in the recent issue of World Journal of Gastrointestinal Surgery. It points out the actuality and importance of the article and focuses primarily on the role and place of ex vivo liver resection and autotransplantation (ELRAT) and systemic therapy, underlying molecular mechanisms for targeted therapy in perihilar cholangiocarcinoma (pCCA) management. pCCA is a tough malignancy with a high proportion of advanced disease at the time of diagnosis. The only curative option is radical surgery. Surgical excision and reconstruction become extremely complicated and not always could be performed even in localized disease. On the other hand, ELRAT takes its place among surgical options for carefully selected pCCA patients. In advanced disease, systemic therapy becomes a viable option to prolong survival. This editorial describes current possibilities in chemotherapy and reveals underlying mechanisms and projections in targeted therapy with kinase inhibitors and immunotherapy in both palliative and adjuvant settings. Fibroblast grow factor and fibroblast grow factor receptor, human epidermal growth factor receptor 2, isocitrate dehydrogenase, and protein kinase cAMP activated catalytic subunit alpha (PRKACA) and beta (PRKACB) pathways have been actively investigated in CCA in last years. Several agents were introduced and approved by the Food and Drug Administration. They all demonstrated meaningful activity in CCA patients with no global change in outcomes. That is why every successfully treated patient counts, especially those with advanced disease. In conclusion, pCCA is still hard to treat due to late diagnosis and extremely complicated surgical options. ELRAT also brings some hope, but it could be performed in very carefully selected patients. Advanced disease requires systemic anticancer treatment, which is supposed to be individualized according to the genetic and molecular features of cancer cells. Targeted therapy in combination with chemo-immunotherapy could be effective in susceptible patients.
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Affiliation(s)
- Konstantin Y Tchilikidi
- Department of Surgery with Postgraduate Education, Altai State Medical University, Barnaul 656031, Russia
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Liu J, Shu J. Immunotherapy and targeted therapy for cholangiocarcinoma: Artificial intelligence research in imaging. Crit Rev Oncol Hematol 2024; 194:104235. [PMID: 38220125 DOI: 10.1016/j.critrevonc.2023.104235] [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: 07/19/2023] [Revised: 12/12/2023] [Accepted: 12/14/2023] [Indexed: 01/16/2024] Open
Abstract
Cholangiocarcinoma (CCA) is a highly aggressive hepatobiliary malignancy, second only to hepatocellular carcinoma in prevalence. Despite surgical treatment being the recommended method to achieve a cure, it is not viable for patients with advanced CCA. Gene sequencing and artificial intelligence (AI) have recently opened up new possibilities in CCA diagnosis, treatment, and prognosis assessment. Basic research has furthered our understanding of the tumor-immunity microenvironment and revealed targeted molecular mechanisms, resulting in immunotherapy and targeted therapy being increasingly employed in the clinic. Yet, the application of these remedies in CCA is a challenging endeavor due to the varying pathological mechanisms of different CCA types and the lack of expressed immune proteins and molecular targets in some patients. AI in medical imaging has emerged as a powerful tool in this situation, as machine learning and deep learning are able to extract intricate data from CCA lesion images while assisting clinical decision making, and ultimately improving patient prognosis. This review summarized and discussed the current immunotherapy and targeted therapy related to CCA, and the research progress of AI in this field.
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Affiliation(s)
- Jiong Liu
- Department of Radiology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, PR China; Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province, Luzhou, Sichuan 646000, PR China
| | - Jian Shu
- Department of Radiology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, PR China; Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province, Luzhou, Sichuan 646000, PR China.
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Wheless M, Agarwal R, Goff L, Lockney N, Padmanabhan C, Heumann T. Current Standards, Multidisciplinary Approaches, and Future Directions in the Management of Extrahepatic Cholangiocarcinoma. Curr Treat Options Oncol 2024; 25:127-160. [PMID: 38177560 PMCID: PMC10824875 DOI: 10.1007/s11864-023-01153-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/19/2023] [Indexed: 01/06/2024]
Abstract
OPINION STATEMENT Biliary tract cancers are molecularly and anatomically diverse cancers which include intrahepatic cholangiocarcinoma, extrahepatic (perihilar and distal) cholangiocarcinoma, and gallbladder cancer. While recognized as distinct entities, the rarer incidence of these cancers combined with diagnostic challenges in classifying anatomic origin has resulted in clinical trials and guideline recommended strategies being generalized patients with all types of biliary tract cancer. In this review, we delve into the unique aspects, subtype-specific clinical trial outcomes, and multidisciplinary management of patients with extrahepatic cholangiocarcinoma. When resectable, definitive surgery followed by adjuvant chemotherapy (sometimes with selective radiation/chemoradiation) is current standard of care. Due to high recurrence rates, there is growing interest in the use of upfront/neoadjuvant therapy to improve surgical outcomes and to downstage patients who may not initially be resectable. Select patients with perihilar cholangiocarcinoma are being successfully treated with novel approaches such as liver transplant. In the advanced disease setting, combination gemcitabine and cisplatin remains the standard base for systemic therapy and was recently improved upon with the addition of immune checkpoint blockade to the chemotherapy doublet in the recently reported TOPAZ-1 and KEYNOTE-966 trials. Second-line all-comer treatments for these patients remain limited in both options and efficacy, so clinical trial participation should be strongly considered. With increased use of molecular testing, detection of actionable mutations and opportunities to receive indicated targeted therapies are on the rise and are the most significant driver of improved survival for patients with advanced stage disease. Though these targeted therapies are currently reserved for the second or later line, future trials are looking at moving these to earlier treatment settings and use in combination with chemotherapy and immunotherapy. In addition to cross-disciplinary management with surgical, medical, and radiation oncology, patient-centered care should also include collaboration with advanced endoscopists, palliative care specialists, and nutritionists to improve global patient outcomes.
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Affiliation(s)
- Margaret Wheless
- Department of Medicine, Division of Hematology Oncology, Vanderbilt University Medical Center, 2220 Pierce Avenue, Preston Research Building Suite 798, Nashville, TN, 37232, USA
| | - Rajiv Agarwal
- Department of Medicine, Division of Hematology Oncology, Vanderbilt University Medical Center, 2220 Pierce Avenue, Preston Research Building Suite 798, Nashville, TN, 37232, USA
- Vanderbilt-Ingram Cancer Center, Nashville, TN, USA
| | - Laura Goff
- Department of Medicine, Division of Hematology Oncology, Vanderbilt University Medical Center, 2220 Pierce Avenue, Preston Research Building Suite 798, Nashville, TN, 37232, USA
- Vanderbilt-Ingram Cancer Center, Nashville, TN, USA
| | - Natalie Lockney
- Vanderbilt-Ingram Cancer Center, Nashville, TN, USA
- Department of Radiation Oncology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Chandrasekhar Padmanabhan
- Vanderbilt-Ingram Cancer Center, Nashville, TN, USA
- Department of Surgery, Division of Surgical Oncology & Endocrine Surgery, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Thatcher Heumann
- Department of Medicine, Division of Hematology Oncology, Vanderbilt University Medical Center, 2220 Pierce Avenue, Preston Research Building Suite 798, Nashville, TN, 37232, USA.
- Vanderbilt-Ingram Cancer Center, Nashville, TN, USA.
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White K, Anwar AI, Jin K, Bollich V, Kelkar RA, Talbot NC, Klapper RJ, Ahmadzadeh S, Viswanath O, Varrassi G, Shekoohi S, Kaye AD. Infigratinib for the Treatment of Metastatic or Locally Advanced Cholangiocarcinoma With Known FGFR2 Gene Fusions or Rearrangements. Cureus 2023; 15:e46792. [PMID: 37954763 PMCID: PMC10634393 DOI: 10.7759/cureus.46792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Accepted: 10/10/2023] [Indexed: 11/14/2023] Open
Abstract
Cholangiocarcinoma (CCA) is an aggressive and diverse malignancy with a poor prognosis. Related to a typical indolent course of progression, most cases of CCA are metastatic or locally advanced at the time of presentation. For patients with nonresectable tumors or metastatic disease, the mainstay of treatment is comprehensive with combination chemotherapy. The first-line chemotherapeutic combination for the treatment of CCA are cisplatin and gemcitabine-based chemotherapies. However, many locally advanced and progressive CCA cases are refractory to first-line management. Within the past few years, the increase in the incidence of metastatic CCA and its poor prognosis has brought to light the need for novel therapeutic approaches to treatment. With advancements in next-generation genome sequencing, multiple molecular pathways have been identified in the pathogenesis of CCA and have shown great potential as alternative treatments in cases of CCA refractory to surgical resection. FGFR2 fusions or rearrangements have been identified in 10-16% of all intrahepatic CCA and are thought to serve as a pathway of resistance for a number of nonresectable and refractory cases of cholangiocarcinoma. A novel therapeutic agent that has been discussed is infigratinib, a selective, ATP-competitive inhibitor of fibroblast growth factor receptor 2 (FGFR2). In a phase 1 trial, infigratinib showed a safe profile and showed remarkable clinical efficacy in advanced CCA with FGFR2 fusions or rearrangements in phase II trials. As of May 2021, the Food and Drug Administration (FDA) approved infigratinib for CCA largely based on tumor response and duration of response. As of 2021, infigratinib, futibatinib, and pemigatinib, similar novel selective FGFR inhibitors, have been approved by the FDA for the treatment of locally advanced or metastatic CCA harboring FGFR2 gene mutations. The present investigation reviews the development of infigratinib in particular and its clinical efficacy compared to other available treatment options for cholangiocarcinoma. While the side effect profile of infigratinib is minimal, particularly GI side effects, when compared with futibatinib and pemigatinib, the overall response rate (ORR) and median overall survival (mOS) for infigratinib (ORR=23.1%, mOS=3.8 months) was significantly lower than futibatinib (ORR=35.8%, mOS=21.1 months) and pemigatinib (ORR=35.5%, mOS=21.1 months). While there is ample promise for the use of infigratinib as molecular-directed therapy in the treatment of CCA harboring FGFR2 mutations, there is an appropriate concern for patient-acquired resistance. The heterogeneous nature of FGFR mutations and the emergence of different resistance mechanisms emphasize a need for more agents to inhibit FGFR rearrangements effectively.
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Affiliation(s)
- Kathryn White
- School of Medicine, Louisiana State University Health Sciences Center, Shreveport, USA
| | - Ahmed I Anwar
- Department of Psychology, Quinnipiac University, Hamden, USA
| | - Kevin Jin
- School of Medicine, Louisiana State University Health Sciences Center, Shreveport, USA
| | - Victoria Bollich
- School of Medicine, Louisiana State University Health Sciences Center, Shreveport, USA
| | - Rucha A Kelkar
- School of Medicine, Medical University of South Carolina, Charleston, USA
| | - Norris C Talbot
- School of Medicine, Louisiana State University Health Sciences Center, Shreveport, USA
| | - Rachel J Klapper
- Radiology, Louisiana State University Health Sciences Center, Shreveport, USA
| | - Shahab Ahmadzadeh
- Department of Anesthesiology, Louisiana State University Health Sciences Center, Shreveport, USA
| | - Omar Viswanath
- Pain Management, Valley Pain Consultants - Envision Physician Services, Phoenix, USA
| | | | - Sahar Shekoohi
- Department of Anesthesiology, Louisiana State University Health Sciences Center, Shreveport, USA
| | - Alan D Kaye
- Department of Anesthesiology, Louisiana State University Health Sciences Center, Shreveport, USA
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Lian Y, Zeng S, Wen S, Zhao X, Fang C, Zeng N. Review and Application of Integrin Alpha v Beta 6 in the Diagnosis and Treatment of Cholangiocarcinoma and Pancreatic Ductal Adenocarcinoma. Technol Cancer Res Treat 2023; 22:15330338231189399. [PMID: 37525872 PMCID: PMC10395192 DOI: 10.1177/15330338231189399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 06/13/2023] [Accepted: 06/28/2023] [Indexed: 08/02/2023] Open
Abstract
Integrin Alpha v Beta 6 is expressed primarily in solid epithelial tumors, such as cholangiocarcinoma, pancreatic cancer, and colorectal cancer. It has been considered a potential and promising molecular marker for the early diagnosis and treatment of cancer. Cholangiocarcinoma and pancreatic ductal adenocarcinoma share genetic, histological, and pathophysiological similarities due to the shared embryonic origin of the bile duct and pancreas. These cancers share numerous clinicopathological characteristics, including growth pattern, poor response to conventional radiotherapy and chemotherapy, and poor prognosis. This review focuses on the role of integrin Alpha v Beta 6 in cancer progression. It addition, it reviews how the marker can be used in molecular imaging and therapeutic targets. We propose further research explorations and questions that need to be addressed. We conclude that integrin Alpha v Beta 6 may serve as a potential biomarker for cancer disease progression and prognosis.
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Affiliation(s)
- Yunyu Lian
- Zhujiang Hospital, The Second School of Clinical Medicine, Southern Medical University, Guangzhou, China
- First Department of Hepatobiliary Surgery, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Silue Zeng
- First Department of Hepatobiliary Surgery, Zhujiang Hospital, Southern Medical University, Guangzhou, China
- Guangdong Provincial Clinical and Engineering Technology Center of Digital Medicine, Guangzhou, China
| | - Sai Wen
- First Department of Hepatobiliary Surgery, Zhujiang Hospital, Southern Medical University, Guangzhou, China
- Guangdong Provincial Clinical and Engineering Technology Center of Digital Medicine, Guangzhou, China
| | - Xingyang Zhao
- First Department of Hepatobiliary Surgery, Zhujiang Hospital, Southern Medical University, Guangzhou, China
- Guangdong Provincial Clinical and Engineering Technology Center of Digital Medicine, Guangzhou, China
| | - Chihua Fang
- Zhujiang Hospital, The Second School of Clinical Medicine, Southern Medical University, Guangzhou, China
- First Department of Hepatobiliary Surgery, Zhujiang Hospital, Southern Medical University, Guangzhou, China
- Guangdong Provincial Clinical and Engineering Technology Center of Digital Medicine, Guangzhou, China
| | - Ning Zeng
- Zhujiang Hospital, The Second School of Clinical Medicine, Southern Medical University, Guangzhou, China
- First Department of Hepatobiliary Surgery, Zhujiang Hospital, Southern Medical University, Guangzhou, China
- Guangdong Provincial Clinical and Engineering Technology Center of Digital Medicine, Guangzhou, China
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Vtorushin SV, Krakhmal NV, Zavalishina LE, Kuznetsova OA, Moskvina LV, Frank GA. [Assessment of HER2 status of carcinomas of various localizations]. Arkh Patol 2023; 85:31-46. [PMID: 38010637 DOI: 10.17116/patol20238506131] [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] [Indexed: 11/29/2023]
Abstract
A detailed description of the methodological aspects of the evaluation of HER2-status in carcinomas of such localizations as the mammary gland, pancreas, salivary glands, stomach, colon, endometrium, bladder, lungs is presented. Approaches and criteria for assessing HER2 status from methodological and clinical points of view are analyzed. The data are systematized in tables for use in practical diagnostic work.
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Affiliation(s)
- S V Vtorushin
- Siberian State Medical University, Tomsk, Russia
- Cancer Research Institute of Tomsk National Research Medical Center, Tomsk, Russia
| | - N V Krakhmal
- Siberian State Medical University, Tomsk, Russia
- Cancer Research Institute of Tomsk National Research Medical Center, Tomsk, Russia
| | - L E Zavalishina
- Russian Medical Academy of Continuous Professional Education, Moscow, Russia
| | - O A Kuznetsova
- Russian Medical Academy of Continuous Professional Education, Moscow, Russia
| | - L V Moskvina
- Russian Medical Academy of Continuous Professional Education, Moscow, Russia
| | - G A Frank
- Russian Medical Academy of Continuous Professional Education, Moscow, Russia
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