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Chen N, He L, Zou Q, Deng H. HER2 targeted therapy in colorectal Cancer: Current landscape and future directions. Biochem Pharmacol 2024; 223:116101. [PMID: 38442793 DOI: 10.1016/j.bcp.2024.116101] [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: 08/31/2023] [Revised: 02/11/2024] [Accepted: 02/27/2024] [Indexed: 03/07/2024]
Abstract
Colorectal cancer (CRC) is one of the most common causes of tumor-related deaths globally. Despite recent improvements in the comprehensive therapy of malignancy, metastatic CRC continues to have a poor prognosis. Human epidermal growth factor receptor 2 (HER2) is an established oncogenic driver, which is successfully targeted for breast and gastric cancers. Approximately 5% of CRC patients carry somatic HER2 mutations or gene amplification. In 2019, the U.S. Food and Drug Administration have approved trastuzumab and pertuzumab in combination with chemotherapy for the treatment of HER2-positive metastatic CRC. This approval marked a significant milestone in the treatment of CRC, as HER2-positive patients now have access to targeted therapies that can improve their outcomes. Yet, assessment for HER2 overexpression/ amplification in CRC has not been standardized. The resistance mechanisms to anti-HER2 therapy have been not clearly investigated in CRC. Although many unknowns remain, an improved understanding of these anti-HER2 agents will be essential for advanced CRC. In this review, we provide an overview of the role of HER2 in CRC as an oncogenic driver, a prognostic and predictive biomarker, and a clinically actionable target, as well as the current progress and challenges in the field.
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Affiliation(s)
- Na Chen
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University and Collaborative Innovation Center for Biotherapy, Chengdu, Sichuan, 610041, China; Center of Science and Research, Chengdu Medical College, Chengdu, 610500, China
| | - Ling He
- Department of Biotherapy, Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, 610041, China
| | - Qiang Zou
- Center of Science and Research, Chengdu Medical College, Chengdu, 610500, China.
| | - Hongxin Deng
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University and Collaborative Innovation Center for Biotherapy, Chengdu, Sichuan, 610041, China.
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Zheng-Lin B, Bekaii-Saab TS. Treatment options for HER2-expressing colorectal cancer: updates and recent approvals. Ther Adv Med Oncol 2024; 16:17588359231225037. [PMID: 38249334 PMCID: PMC10798128 DOI: 10.1177/17588359231225037] [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: 08/28/2023] [Accepted: 12/18/2023] [Indexed: 01/23/2024] Open
Abstract
Colorectal cancer is a leading cause of cancer-related mortality worldwide. Approximately 3-5% of colorectal tumors harbor human epidermal growth factor receptor (HER2) amplification which is associated with a higher incidence of intracranial metastasis and overall worse outcomes. In the setting of refractory metastatic RAS wild-type tumors, evidence supports the use of various HER2-blocking agents, including monoclonal antibodies, tyrosine kinase inhibitors, and novel antibody-drug conjugates. With a number of relatively active agents clinically available and even more in development, it is crucial for clinicians to familiarize themselves with the mechanisms of action, efficacy data, and safety profiles of these treatments. In this review, we aim to summarize key findings from past and ongoing trials with anti-HER2 agents in metastatic colorectal cancer.
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Affiliation(s)
- Binbin Zheng-Lin
- Division of Hematology and Oncology, Mayo Clinic, Phoenix, AZ, USA
| | - Tanios S. Bekaii-Saab
- Division of Hematology and Medical Oncology, Mayo Clinic, 5881 East Mayo Blvd, Phoenix, AZ 85054, USA
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3
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Singh H, Kang A, Bloudek L, Hsu LI, Corinna Palanca-Wessels M, Stecher M, Siadak M, Ng K. Systematic literature review and meta-analysis of HER2 amplification, overexpression, and positivity in colorectal cancer. JNCI Cancer Spectr 2024; 8:pkad082. [PMID: 37815820 PMCID: PMC10868379 DOI: 10.1093/jncics/pkad082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 08/25/2023] [Accepted: 09/21/2023] [Indexed: 10/11/2023] Open
Abstract
BACKGROUND Colorectal cancer (CRC) is the second most common cause of cancer death globally. Recent clinical trials suggest an emerging role for HER2 as a potential clinically relevant biomarker in CRC. Testing for HER2 in CRC is not standard practice; consequently, the prevalence of HER2 positivity (HER2+) in patients with CRC remains uncertain. METHODS A systematic literature review and meta-analysis were conducted to generate estimates of proportions of patients with CRC with HER2 overexpression or HER2 amplification and HER2+ (either overexpression or amplification), overall and in patients with rat sarcoma virus (RAS) wild-type cancer. HER2+ was defined as 1) immunohistochemistry with a score of 3+, 2) immunohistochemistry with a score of 2+ and in situ hybridization+, or 3) next-generation sequencing positive. RESULTS Of 224 studies identified with information on HER2 in CRC, 52 studies used a US Food and Drug Administration-approved assay and were selected for further analysis. Estimated HER2+ rate was 4.1% (95% confidence interval [CI] = 3.4% to 5.0%) overall (n = 17 589). HER2+ rates were statistically higher in RAS wild-type (6.1%, 95% CI = 5.4% to 6.9%) vs RAS mutant CRC (1.1%, 95% CI = 0.3% to 4.4%; P < .0001). Despite limited clinical information, we confirmed enrichment of HER2+ CRC in patients with microsatellite stable and left-sided CRC. CONCLUSION This meta-analysis provides an estimate of HER2+ CRC and confirms enrichment of HER2 in microsatellite stable, left-sided, RAS wild-type CRC tumors. Our work is important given the recently described clinical efficacy of HER2-targeted therapies in HER2+ CRC and informs strategies for incorporation of HER2 testing into standard of care.
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Affiliation(s)
- Harshabad Singh
- Division of Gastrointestinal Cancers, Dana-Farber Cancer Institute, Boston, MA, USA
| | | | | | | | | | | | | | - Kimmie Ng
- Division of Gastrointestinal Cancers, Dana-Farber Cancer Institute, Boston, MA, USA
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4
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Casak SJ, Horiba MN, Yuan M, Cheng J, Lemery SJ, Shen YL, Fu W, Moore JN, Li Y, Bi Y, Auth D, Fesenko N, Kluetz PG, Pazdur R, Fashoyin-Aje LA. FDA Approval Summary: Tucatinib with Trastuzumab for Advanced Unresectable or Metastatic, Chemotherapy Refractory, HER2-Positive RAS Wild-Type Colorectal Cancer. Clin Cancer Res 2023; 29:4326-4330. [PMID: 37318379 PMCID: PMC10722550 DOI: 10.1158/1078-0432.ccr-23-1041] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Revised: 05/03/2023] [Accepted: 06/12/2023] [Indexed: 06/16/2023]
Abstract
On January 19, 2023, the FDA granted accelerated approval to tucatinib in combination with trastuzumab for the treatment of patients with unresectable or metastatic RAS wild-type, HER2-positive colorectal cancer who have received prior treatment with fluoropyrimidine, oxaliplatin, and irinotecan. Approval was based on the pooled analysis of patients receiving tucatinib in combination with trastuzumab in MOUNTAINEER (NCT03043313), an open-label, multicenter trial. The primary endpoint was overall response rate (ORR) by RECIST 1.1 as per blinded central review committee (BIRC) assessment. The main secondary endpoint was duration of response (DOR) per BIRC assessment. Eighty-four eligible patients received the combination tucatinib and trastuzumab. With a median follow-up of 16 months, the ORR was 38% [95% confidence interval (CI): 28-49] and median DOR was 12.4 months (95% CI: 8.5-20.5); 81% of responders had a response lasting more than 6 months. The most common adverse reactions observed in at least 20% of patients receiving tucatinib in combination with trastuzumab were diarrhea, fatigue, rash, nausea, abdominal pain, infusion-related reactions, and fever. FDA concluded that the magnitude of ORR and durable responses observed in patients treated with tucatinib in combination with trastuzumab in the MOUNTAINEER trial are clinically meaningful, particularly in the context of a disease with estimated survival of 6-7 months with available therapy. This is the first approval for the subset of patients with HER2-positive colorectal cancer. This article summarizes the FDA's thought process and review of the data supporting this accelerated approval.
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Affiliation(s)
- Sandra J. Casak
- Center for Drug Evaluation and Research, U.S. Food and Drug Administration
| | - M. Naomi Horiba
- Center for Drug Evaluation and Research, U.S. Food and Drug Administration
| | - Mengdie Yuan
- Center for Drug Evaluation and Research, U.S. Food and Drug Administration
| | - Joyce Cheng
- Center for Drug Evaluation and Research, U.S. Food and Drug Administration
| | - Steven J. Lemery
- Center for Drug Evaluation and Research, U.S. Food and Drug Administration
| | - Yuan Li Shen
- Center for Drug Evaluation and Research, U.S. Food and Drug Administration
| | - Wentao Fu
- Center for Drug Evaluation and Research, U.S. Food and Drug Administration
| | - Jason N. Moore
- Center for Drug Evaluation and Research, U.S. Food and Drug Administration
| | - Yangbing Li
- Center for Drug Evaluation and Research, U.S. Food and Drug Administration
| | - Youwei Bi
- Center for Drug Evaluation and Research, U.S. Food and Drug Administration
| | - Doris Auth
- Center for Drug Evaluation and Research, U.S. Food and Drug Administration
| | - Nataliya Fesenko
- Center for Drug Evaluation and Research, U.S. Food and Drug Administration
| | - Paul G. Kluetz
- Center for Drug Evaluation and Research, U.S. Food and Drug Administration
- Oncology Center of Excellence, U.S. Food and Drug Administration
| | - Richard Pazdur
- Center for Drug Evaluation and Research, U.S. Food and Drug Administration
- Oncology Center of Excellence, U.S. Food and Drug Administration
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Wang YY, Xin ZC, Wang K. Impact of Molecular Status on Metastasectomy of Colorectal Cancer Liver Metastases. Clin Colon Rectal Surg 2023; 36:423-429. [PMID: 37795466 PMCID: PMC10547543 DOI: 10.1055/s-0043-1767700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/06/2023]
Abstract
Although surgical resection could provide better survival for patients with colorectal cancer liver metastases (CRLM), the recurrence rate after resection of CRLM remains high. The progress of genome sequencing technologies has greatly improved the molecular understanding of colorectal cancer. In the era of genomics and targeted therapy, genetic mutation analysis is of great significance to guide systemic treatment and identify patients who can benefit from resection of CRLM. RAS and BRAF mutations and microsatellite instability/deficient deoxyribonucleic acid (DNA) mismatch repair status have been incorporated into current clinical practice. Other promising molecular biomarkers such as coexisting gene mutations and circulating tumor DNA are under active investigation. This study aimed to review the prognostic significance of molecular biomarkers in patients with CRLM undergoing metastasectomy based on the current evidence.
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Affiliation(s)
- Yan-Yan Wang
- Hepatopancreatobiliary Surgery Department I, Key Laboratory of Carcinogenesis and Translational Research, Ministry of Education, Peking University School of Oncology, Beijing Cancer Hospital and Institute, Beijing, China
| | - Ze-Chang Xin
- Hepatopancreatobiliary Surgery Department I, Key Laboratory of Carcinogenesis and Translational Research, Ministry of Education, Peking University School of Oncology, Beijing Cancer Hospital and Institute, Beijing, China
| | - Kun Wang
- Hepatopancreatobiliary Surgery Department I, Key Laboratory of Carcinogenesis and Translational Research, Ministry of Education, Peking University School of Oncology, Beijing Cancer Hospital and Institute, Beijing, China
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Bekaii-Saab TS, Lach K, Hsu LI, Siadak M, Stecher M, Ward J, Beckerman R, Strickler JH. Impact of Anti-EGFR Therapies on HER2-Positive Metastatic Colorectal Cancer: A Systematic Literature Review and Meta-Analysis of Clinical Outcomes. Oncologist 2023; 28:885-893. [PMID: 37463037 PMCID: PMC10546818 DOI: 10.1093/oncolo/oyad200] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Accepted: 06/16/2023] [Indexed: 10/04/2023] Open
Abstract
BACKGROUND HER2 overexpression/amplification in patients with RAS wild-type (WT) metastatic colorectal cancer (mCRC) may be associated with resistance to standard-of-care anti-EGFR therapies. Given the lack of comprehensive investigations into this association, we assessed the prognostic or predictive effect of HER2 amplification/overexpression on anti-EGFR treatment outcomes. METHODS A systematic review of MEDLINE, Embase, and Cochrane Library (2001-2021) identified studies evaluating progression-free survival (PFS), overall response rate (ORR), and overall survival (OS) in HER2-positive vs. HER2-negative patients with RAS WT mCRC who received anti-EGFR treatments and whose HER2 status was known. Meta-analyses of proportions (ORR) and hazard ratios (PFS, OS) were performed using random-effect models with pre-specified sensitivity analyses. RESULTS Five high-quality retrospective cohort studies were included in the meta-analyses representing 594 patients with mCRC. All patients received anti-EGFR treatment, either as monotherapy or in combination with chemotherapy. Meta-analysis of PFS demonstrated a 2.84-fold higher risk of death or progression (95% CI, 1.44-5.60) in patients with HER2-positive (vs. HER2-negative) RAS WT mCRC treated with anti-EGFR regimens. The odds of response to anti-EGFR treatment were 2-fold higher in HER2-negative vs. HER2-positive (odds ratio, 1.96 [95% CI, 1.10-3.48]). Differences in OS were not statistically significant. Sensitivity analyses confirmed the robustness of the base-case estimates. CONCLUSIONS While this study could not account for all confounding factors, in patients with RAS WT mCRC who received anti-EGFR therapy, HER2 overexpression/amplification was associated with worse PFS and ORR and may therefore predict poorer outcomes. HER2 testing is important to inform treatment decisions and could optimize outcomes for patients.
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Affiliation(s)
| | | | | | | | | | | | | | - John H Strickler
- Division of Medical Oncology, Duke University Medical Center, Durham, NC, USA
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Hashimoto T, Takayanagi D, Yonemaru J, Naka T, Nagashima K, Machida E, Kohno T, Yatabe Y, Kanemitsu Y, Hamamoto R, Takashima A, Shiraishi K, Sekine S. A comprehensive appraisal of HER2 heterogeneity in HER2-amplified and HER2-low colorectal cancer. Br J Cancer 2023; 129:1176-1183. [PMID: 37543670 PMCID: PMC10539373 DOI: 10.1038/s41416-023-02382-z] [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: 04/29/2023] [Revised: 07/21/2023] [Accepted: 07/26/2023] [Indexed: 08/07/2023] Open
Abstract
BACKGROUND This study aimed to elucidate the clinicopathological and molecular features of HER2-amplified and HER2-low colorectal cancers (CRCs). We also characterised HER2 expression statuses in CRCs focusing on their intratumoral heterogeneity and alterations in metastatic lesions to establish practical HER2 status assessment. METHODS We evaluated 1009 CRCs for HER2 expression and HER2 amplification by immunohistochemistry and FISH, respectively, and correlated the results to clinicopathological and molecular data. For HER2-positive tumours, HER2 expression in metastatic lesions was also assessed. RESULTS Twenty-five HER2-amplified (2.5%) and 46 HER2-low tumours (4.6%) were identified. HER2-amplified tumours consistently lacked a mucinous component and HER2-low tumours tended to be in the right colon, but no other clinicopathological features were noted. KRAS, NRAS or BRAF mutations were detected in only two HER2-amplified tumours (8%), whereas 23 HER2-low tumours (50%) had one of these mutations. Most HER2-amplified and HER2-low tumours showed a homogeneous or mosaic HER2 expression pattern and a clustered heterogeneous expression pattern was rather rare. HER2 expression was maintained in most metastatic lesions in both HER2-amplified (93%) and HER2-low tumours (81%). CONCLUSIONS These results suggest that biopsy-based assessment of primary lesions is appropriate for the identification of CRC patients eligible for systemic HER2-targeted therapy.
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Affiliation(s)
- Taiki Hashimoto
- Division of Diagnostic Pathology, National Cancer Center Hospital, Tokyo, Japan
| | - Daisuke Takayanagi
- Division of Genome Biology, National Cancer Center Research Institute, Tokyo, Japan
- Department of Medicine, Division of Medical Oncology, Showa University School of Medicine, Tokyo, Japan
- Department of Clinical Diagnostic Oncology, Clinical Research Institute for Clinical Pharmacology and Therapeutics, Showa University, Tokyo, Japan
| | - Junpei Yonemaru
- Division of Diagnostic Pathology, National Cancer Center Hospital, Tokyo, Japan
| | - Tomoaki Naka
- Division of Diagnostic Pathology, National Cancer Center Hospital, Tokyo, Japan
| | - Kengo Nagashima
- Biostatistics Unit, Clinical and Translational Research Center, Keio University Hospital, Tokyo, Japan
| | - Erika Machida
- Division of Genome Biology, National Cancer Center Research Institute, Tokyo, Japan
| | - Takashi Kohno
- Division of Genome Biology, National Cancer Center Research Institute, Tokyo, Japan
| | - Yasushi Yatabe
- Division of Diagnostic Pathology, National Cancer Center Hospital, Tokyo, Japan
- Division of Molecular Pathology, National Cancer Center Research Institute, Tokyo, Japan
| | - Yukihide Kanemitsu
- Department of Colorectal Surgery, National Cancer Center Hospital, Tokyo, Japan
| | - Ryuji Hamamoto
- Division of Medical AI Research and Development, National Cancer Center Research Institute, Tokyo, Japan
| | - Atsuo Takashima
- Division of Gastrointestinal Medical Oncology, National Cancer Center Hospital, Tokyo, Japan
| | - Kouya Shiraishi
- Division of Genome Biology, National Cancer Center Research Institute, Tokyo, Japan
- Department of Clinical Genomics, National Cancer Center Research Institute, Tokyo, Japan
| | - Shigeki Sekine
- Division of Diagnostic Pathology, National Cancer Center Hospital, Tokyo, Japan.
- Division of Molecular Pathology, National Cancer Center Research Institute, Tokyo, Japan.
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Bonilla CE, Montenegro P, O’Connor JM, Hernando-Requejo O, Aranda E, Pinto Llerena J, Llontop A, Gallardo Escobar J, Díaz Romero MDC, Bautista Hernández Y, Graña Suárez B, Batagelj EJ, Wali Mushtaq A, García-Foncillas J. Ibero-American Consensus Review and Incorporation of New Biomarkers for Clinical Practice in Colorectal Cancer. Cancers (Basel) 2023; 15:4373. [PMID: 37686649 PMCID: PMC10487247 DOI: 10.3390/cancers15174373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 08/21/2023] [Accepted: 08/22/2023] [Indexed: 09/10/2023] Open
Abstract
Advances in genomic technologies have significantly improved the management of colorectal cancer (CRC). Several biomarkers have been identified in CRC that enable personalization in the use of biologic agents that have shown to enhance the clinical outcomes of patients. However, technologies used for their determination generate massive amounts of information that can be difficult for the clinician to interpret and use adequately. Through several discussion meetings, a group of oncology experts from Spain and several Latin American countries reviewed the latest literature to provide practical recommendations on the determination of biomarkers in CRC based on their clinical experience. The article also describes the importance of looking for additional prognostic biomarkers and the use of histopathology to establish an adequate molecular classification. Present and future of immunotherapy biomarkers in CRC patients are also discussed, together with several techniques for marker determination, including liquid biopsy, next-generation sequencing (NGS), polymerase chain reaction (PCR), and fecal immunohistochemical tests. Finally, the role of Molecular Tumor Boards in the diagnosis and treatment of CRC is described. All of this information will allow us to highlight the importance of biomarker determination in CRC.
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Affiliation(s)
- Carlos Eduardo Bonilla
- Fundación CTIC—Centro de Tratamiento e Investigación sobre Cáncer, Bogotá 1681442, Colombia
| | - Paola Montenegro
- Institución AUNA OncoSalud e Instituto Nacional de Enfermedades Neoplásicas, Lima 15023, Peru
| | | | | | - Enrique Aranda
- Departamento de Oncología Médica, Hospital Reina Sofía, IMIBIC, UCO, CIBERONC, 14004 Cordoba, Spain;
| | | | - Alejandra Llontop
- Instituto de Oncología Ángel H. Roffo, Ciudad Autónoma de Buenos Aires C1437FBG, Argentina
| | | | | | | | - Begoña Graña Suárez
- Servicio de Oncología Médica, Hospital Universitario de A Coruña, Servicio Galego de Saúde (SERGAS), 15006 A Coruña, Spain;
| | | | | | - Jesús García-Foncillas
- Hospital Universitario Fundación Jiménez Díaz, Universidad Autónoma de Madrid, 28040 Madrid, Spain
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Dao V, Heestand G. Beyond EGFR inhibitors in advanced colorectal cancer: Targeting BRAF and HER2. Curr Probl Cancer 2023; 47:100960. [PMID: 37285606 DOI: 10.1016/j.currproblcancer.2023.100960] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 04/14/2023] [Accepted: 04/18/2023] [Indexed: 06/09/2023]
Abstract
The addition of antiepidermal growth factor receptor (EGFR) monoclonal antibodies, cetuximab or panitumumab, to conventional chemotherapy has improved clinical outcomes for rat sarcoma virus (RAS) wild-type advanced colorectal cancer patients, however, durable responses and 5-year overall survival rates remain limited. BRAF V600E somatic mutation and human epidermal growth factor receptor (HER2) amplification/overexpression have been separately implicated in primary resistance to anti-EGFR therapeutic strategies via aberrant activation of the mitogen-activated protein kinase (MAPK) signaling pathway, resulting in poorer outcomes. In addition to being a negative predictive biomarker for anti-EGFR therapy, BRAF V600E mutation and HER2 amplification/overexpression serve as positive predictors of response to therapies targeting these respective tumor promoters. This review will highlight key clinical studies that support the rational use of v-Raf murine sarcoma viral oncogene homolog B1 (BRAF) and HER2-targeted therapies, often in combination with other targeted agents, cytotoxic chemotherapy, and immune checkpoint inhibitors. We discuss current challenges with BRAF and HER2-targeted therapies in metastatic colorectal cancer and potential opportunities for improvement.
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Affiliation(s)
- Vinh Dao
- Department of Medicine, Division of Oncology, Stanford University School of Medicine, Stanford, California; Department of Medicine, Division of Hematology, Stanford University School of Medicine, Stanford, California
| | - Gregory Heestand
- Department of Medicine, Division of Oncology, Stanford University School of Medicine, Stanford, California.
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Yoshino T, Di Bartolomeo M, Raghav K, Masuishi T, Loupakis F, Kawakami H, Yamaguchi K, Nishina T, Wainberg Z, Elez E, Rodriguez J, Fakih M, Ciardiello F, Saxena K, Kobayashi K, Bako E, Okuda Y, Meinhardt G, Grothey A, Siena S. Final results of DESTINY-CRC01 investigating trastuzumab deruxtecan in patients with HER2-expressing metastatic colorectal cancer. Nat Commun 2023; 14:3332. [PMID: 37286557 DOI: 10.1038/s41467-023-38032-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 04/12/2023] [Indexed: 06/09/2023] Open
Abstract
DESTINY-CRC01 (NCT03384940) was a multicenter, open-label, phase 2 trial assessing the efficacy and safety of trastuzumab deruxtecan (T-DXd) in patients with HER2-expressing metastatic colorectal cancer (mCRC) that progressed after ≥2 prior regimens; results of the primary analysis are published. Patients received T-DXd 6.4 mg/kg every 3 weeks and were assigned to either: cohort A (HER2-positive, immunohistochemistry [IHC] 3+ or IHC 2+/in situ hybridization [ISH]+), cohort B (IHC 2+/ISH-), or cohort C (IHC 1+). Primary endpoint was objective response rate (ORR) by independent central review in cohort A. Secondary endpoints included ORR (cohorts B and C), duration of response, disease control rate, progression-free survival, overall survival, pharmacokinetics, and safety of T-DXd. 86 patients were enrolled (53 in cohort A, 15 in cohort B, and 18 in cohort C). Results of the primary analysis are published, reporting an ORR of 45.3% in cohort A. Here, we report the final results. No responses occurred in cohorts B or C. Median progression-free survival, overall survival, and duration of response were 6.9, 15.5, and 7.0 months, respectively. Overall serum exposure (cycle 1) of T-DXd, total anti-HER2 antibody, and DXd were similar regardless of HER2 status. Most common grade ≥3 treatment-emergent adverse events were decreased neutrophil count and anemia. Adjudicated drug-related interstitial lung disease/pneumonitis occurred in 8 patients (9.3%). These findings support the continued exploration of T-DXd in HER2-positive mCRC.
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Affiliation(s)
| | | | - Kanwal Raghav
- The University of Texas MD Anderson Cancer Center, Houston, USA
| | | | | | | | | | - Tomohiro Nishina
- National Hospital Organization Shikoku Cancer Center, Matsuyama, Japan
| | | | - Elena Elez
- Vall d'Hebron Barcelona Hospital Campus, Vall d'Hebron Institute of Oncology, Universitat Autònoma de Barcelona, Barcelona, Spain
| | | | - Marwan Fakih
- City of Hope National Medical Center, Philadelphia, USA
| | | | | | | | | | | | | | | | - Salvatore Siena
- Università degli Studi di Milano, Milan, Italy.
- Grande Ospedale Metropolitano Niguarda, Milan, Italy.
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11
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Lang-Schwarz C, Vieth M, Dregelies T, Sterlacci W. Frequency of Her2-low in colorectal cancer and its relations with the tumor microenvironment. Pathol Res Pract 2023; 244:154417. [PMID: 36947983 DOI: 10.1016/j.prp.2023.154417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 03/09/2023] [Accepted: 03/16/2023] [Indexed: 03/19/2023]
Abstract
BACKGROUND To date, little is known regarding human epithelial growth factor receptor (HER2) low-expressing colorectal cancer (CRC). Due to promising rising therapies with HER2-antibody-drug conjugates we aimed to analyze the frequency of HER2-low in patients with CRC. Additionally we characterized the clinicopathologic background of this group and its potential relationship with the tumor microenvironment represented by budding and tumor infiltrating lymphocytes (TILs). METHODS 319 patients with CRC, stages I-IV, were enrolled. HER2-immunohistochemistry (IHC) as well as fluorescence in situ hybridization (FISH) were performed on tissue microarrays. IHC was evaluated semiquantitatively and software-assisted using the HERACLES Diagnostic Criteria for CRC. HER2-low was defined as IHC 1 + or 2 +/FISH negative. HER2-IHC results were compared with budding, TILs and their combinations. RESULTS The HER2 low-expressing subset represented almost one half of all CRC (47.1 %). Assessment was highly reproducible with different methods. HER2-low cases were significantly more often lower T-, N-, and tumor stage and had less L1 compared with HER2-0. Additionally, they showed more often TILs > 5 % (p = 0.001). The difference between HER2-0 and HER2-low was highly significant between the four budding/TILs-groups (p < 0.001). Cases with low budding/high TILs were more often HER2-low. The highest difference was seen between the low budding/high TILs-group and the low budding/low TILs-group (p < 0.001). CONCLUSIONS HER2-low expression in CRC is frequent and involves nearly one half of all patients. We could show a relationsship between HER2-low expression and the tumor microenvironment. Special attention should be paid to the low budding/high TILs group in future research.
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Affiliation(s)
- Corinna Lang-Schwarz
- Institute of Pathology, Klinikum Bayreuth GmbH, Friedrich-Alexander-University Erlangen-Nuremberg, Preuschwitzer Str. 101, 95445 Bayreuth, Germany.
| | - Michael Vieth
- Institute of Pathology, Klinikum Bayreuth GmbH, Friedrich-Alexander-University Erlangen-Nuremberg, Preuschwitzer Str. 101, 95445 Bayreuth, Germany
| | - Theresa Dregelies
- Institute of Pathology, Klinikum Bayreuth GmbH, Friedrich-Alexander-University Erlangen-Nuremberg, Preuschwitzer Str. 101, 95445 Bayreuth, Germany
| | - William Sterlacci
- Institute of Pathology, Klinikum Bayreuth GmbH, Friedrich-Alexander-University Erlangen-Nuremberg, Preuschwitzer Str. 101, 95445 Bayreuth, Germany
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[Targeting HER2 in colorectal cancer]. Bull Cancer 2023; 110:402-411. [PMID: 36870811 DOI: 10.1016/j.bulcan.2023.01.013] [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: 11/28/2022] [Revised: 01/10/2023] [Accepted: 01/12/2023] [Indexed: 03/06/2023]
Abstract
Among the molecular subgroups of interest in metastatic colorectal cancer (mCRC), innovations are underway for tumors with overexpression of HER2 (Human Epidermal Growth Factor Receptor 2). Overexpression of the HER2 protein concerns 2 to 5% of CRC at any stage mainly located in the distal colon and rectum. Diagnosis is based on immunohistochemistry, in situ hybridization with appropriate criteria for colorectal localization, and molecular biology (NGS: next-generation sequencing). Overexpression of HER2 is a predictive factor for resistance to treatments targeting EGFR which are indicated in the case where the tumor is wild-type RAS. It seems to be associated with a poor prognosis of mCRC with a higher risk of brain metastasis. Regarding treatments targeting HER2, no randomized controlled phase III has been published to date. However, several combinations have been evaluated in phase II with clinically meaningful objective response rates: trastuzumab-deruxtecan (45%), trastuzumab-tucatinib (46%), trastuzumab-pyrotinib (45%), trastuzumab-pertuzumab (30%) ou trastuzumab-lapatinib (30%). In this literature review, we present here the current state of knowledge on the diagnostic methods of HER2 overexpression in CRC, the main clinical, molecular and prognostic characteristics, and the efficacy results of the different therapeutic combinations for the patients with HER2 overexpressed mCRC. This justifies, despite the lack of marketing authorization in France and in Europe for agents targeting HER2 in CRC, the systematic evaluation of the HER2 status, as recommended in particular by the NCCN (National Comprehensive Cancer Network).
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Wu Z, Cheng Y, Wang H, Liu D, Qi X, Wang C, Zhang Y, Zhang Y, Cai R, Huo H, Zhang J, Cai Y, Li W, Hu H, Deng Y. Distinct Clinicopathological Features and Prognostic Values of High-, Low-, or Non-Expressing HER2 Status in Colorectal Cancer. Cancers (Basel) 2023; 15:cancers15020554. [PMID: 36672503 PMCID: PMC9856362 DOI: 10.3390/cancers15020554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 01/05/2023] [Accepted: 01/12/2023] [Indexed: 01/18/2023] Open
Abstract
The encouraging effects of HER2-ADC in patients with HER2-low expression cancers indicated the classical classifications based on positive and negative HER2 might no longer be suitable. However, the biology and prognosis of colorectal cancer patients with different HER2 expression status were still not clear. This is a multi-center retrospective study that included patients with histologically confirmed colorectal cancer and determined HER2 status who received radical surgical resection. HER2 immunohistochemistry (IHC) 1+ and IHC 2+ groups were combined and defined as a HER2-low group because of the concordance of clinicopathological characteristics. As compared with the HER2-high group, both the HER2-zero and the HER2-low group had less tumor with perineural invasion (14.3%, 13.1% vs. 31.6%, p = 0.001 and p < 0.001), less stage III disease (41.8%, 39.9% vs. 56.1%, p = 0.044 and p = 0.022), more RAS/BRAF mutation (52.1%, 49.9% vs. 19.5%, p < 0.001 and p < 0.001) and better disease-free survival (DFS) (3y-DFS rate of 78.7%, 82.4% vs. 59.3%, p < 0.001 and p < 0.001). Multivariate analysis and propensity score matching also revealed that HER2-high expression was an independent prognostic factor of DFS. In conclusion, our study revealed that HER2-low colorectal cancer tumors are close to HER2-zero tumors, but different from HER2-high tumors. The routine examination of HER2 IHC is needed in early-stage colorectal cancer.
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Affiliation(s)
- Zehua Wu
- Department of Medical Oncology, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Disease, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
| | - Yi Cheng
- Department of Medical Oncology, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Disease, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
| | - Huaiming Wang
- Department of Gastrointestinal Surgery, The First Affiliated Hospital of Shantou University Medical College, Shantou 515000, China
| | - Dian Liu
- Department of Lymphoma and Abdominal Radiotherapy, Hunan Cancer Hospital and the Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha 410013, China
| | - Xiaoxing Qi
- Department of Medical Oncology, The Third Affiliated Hospital of Xinxiang Medical University, Xinxiang 453002, China
| | - Chao Wang
- Department of Pathology, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
| | - Yuanzhe Zhang
- Department of Medical Oncology, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Disease, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
| | - Yuting Zhang
- Department of Medical Oncology, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Disease, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
| | - Runkai Cai
- Department of Medical Oncology, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Disease, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
| | - Hong Huo
- Department of Medical Oncology, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
| | - Jianwei Zhang
- Department of Medical Oncology, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Disease, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
| | - Yue Cai
- Department of Medical Oncology, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Disease, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
| | - Weiwei Li
- Department of Medical Oncology, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Disease, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
| | - Huabin Hu
- Department of Medical Oncology, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Disease, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
| | - Yanhong Deng
- Department of Medical Oncology, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Disease, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
- Correspondence: ; Tel.: +86-13925106525
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Yoshikawa A, Nakamura Y. Molecular Basis of HER2-Targeted Therapy for HER2-Positive Colorectal Cancer. Cancers (Basel) 2022; 15:183. [PMID: 36612185 PMCID: PMC9818808 DOI: 10.3390/cancers15010183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 12/22/2022] [Accepted: 12/27/2022] [Indexed: 12/30/2022] Open
Abstract
Human epidermal growth factor receptor 2 (HER2) amplification has emerged as a biomarker in colorectal cancer (CRC), occurring in 1-4% of metastatic CRC (mCRC). In addition to conventional methods, such as immunohistochemistry and fluorescence in situ hybridization, next-generation sequencing-based tissue or circulating tumor DNA analysis has recently been used to identify HER2 amplification and assess HER2 overexpression. Prospective clinical trials have demonstrated the efficacy of HER2-targeted therapies in HER2-positive mCRC. The TRIUMPH study, a phase II study of dual HER2 antibodies, i.e., pertuzumab plus trastuzumab, demonstrated promising efficacy for patients with HER2-positive mCRC confirmed by tissue-and/or blood-based techniques, which led to the regulatory approval of this combination therapy in Japan. The mechanisms associated with efficacy and resistance have also been explored in translational studies that incorporate liquid biopsy in prospective trials. In particular, HER2 copy number and co-alterations have repeatedly been reported as biomarkers related to efficacy. To improve the therapeutic efficacy of the current strategy, many clinical trials with various HER2-targeted agents are ongoing. This review discusses the molecular basis of HER2-targeted therapeutic strategies for patients with HER2-positive mCRC.
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Affiliation(s)
- Ayumu Yoshikawa
- Department of Gastroenterology and Gastrointestinal Oncology, National Cancer Center Hospital East, Kashiwa 277-0882, Japan
| | - Yoshiaki Nakamura
- Department of Gastroenterology and Gastrointestinal Oncology, National Cancer Center Hospital East, Kashiwa 277-0882, Japan
- International Research Promotion Office, National Cancer Center Hospital East, Kashiwa 277-0882, Japan
- Translational Research Support Section, National Cancer Center Hospital East, Kashiwa 277-0882, Japan
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Precision Medicine in Metastatic Colorectal Cancer: Targeting ERBB2 (HER-2) Oncogene. Cancers (Basel) 2022; 14:cancers14153718. [PMID: 35954382 PMCID: PMC9367374 DOI: 10.3390/cancers14153718] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 07/27/2022] [Accepted: 07/28/2022] [Indexed: 02/01/2023] Open
Abstract
Simple Summary Colorectal cancer (CRC) is the third most common cancer in terms of incidence rate in adults and the second most common cause of cancer-related death in Europe. The treatment of metastatic CRC (mCRC) is based on the use of chemotherapy, anti-vascular endothelial growth factor (VEGF), and anti-epidermal growth factor receptor (EGFR) for RAS wild-type tumors. Precision medicine tries to identify molecular alterations that could be treated with targeted therapies. Although ERBB2 (also known as HER-2) has an important therapeutic role in breast and esophagogastric cancer, there are no approved ERBB2-targeted therapies for mCRC. The purpose of this review is to describe the landscape of ERBB2-positive mCRC. Abstract Colorectal cancer (CRC) is the third most common cancer in terms of incidence rate in adults and the second most common cause of cancer-related death in Europe. The treatment of metastatic CRC (mCRC) is based on the use of chemotherapy, anti-vascular endothelial growth factor (VEGF), and anti-epidermal growth factor receptor (EGFR) for RAS wild-type tumors. Precision medicine tries to identify molecular alterations that could be treated with targeted therapies. ERBB2 amplification (also known as HER-2) has been identified in 2–3% of patients with mCRC, but there are currently no approved ERBB2-targeted therapies for mCRC. The purpose of this review is to describe the molecular structure of ERBB2, clinical features of these patients, diagnosis of ERBB2 alterations, and the most relevant clinical trials with ERBB2-targeted therapies in mCRC.
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Strickler JH, Yoshino T, Graham RP, Siena S, Bekaii-Saab T. Diagnosis and Treatment of ERBB2-Positive Metastatic Colorectal Cancer: A Review. JAMA Oncol 2022; 8:760-769. [PMID: 35238866 DOI: 10.1001/jamaoncol.2021.8196] [Citation(s) in RCA: 35] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Importance Amplification of ERBB2 (formerly referred to as HER2) is present in nearly 3% of patients with metastatic colorectal cancer overall and 5% of patients with KRAS and NRAS wild-type tumors. Despite the availability of several ERBB2-targeted therapeutic options for patients with ERBB2-positive breast and gastric/gastroesophageal tumors, to date, there are currently no approved therapies for patients with ERBB2-positive metastatic colorectal cancer, although ERBB2-targeted therapies are recommended in National Comprehensive Cancer Network guidelines. Recent evidence indicates that anti-ERBB2 therapeutic strategies are active in patients with ERBB2-positive metastatic colorectal cancer and could potentially represent a new standard-of-care. Observations The protein ERBB2 is a member of a family of epidermal growth factor receptors that also includes epidermal growth factor receptor (ERBB1), ERBB3, and ERBB4. Amplification of ERBB2 leads to overexpression of the ERBB2 tyrosine kinase receptor, resulting in aberrant signaling and cell migration, growth, adhesion, and differentiation. Colorectal tumors that harbor ERBB2 amplification are more likely to originate on the left side of the colon, are associated with primary and acquired resistance to anti-epidermal growth factor receptor therapies, and have increased incidence of central nervous system metastases. Using immunohistochemistry, fluorescence in situ hybridization, next-generation sequencing, and liquid biopsy techniques, several randomized clinical trials have evaluated the efficacy of ERBB2-targeted therapies in patients with ERBB2-positive metastatic colorectal cancer. These therapies include monoclonal antibodies, antibody-drug conjugates, and tyrosine kinase inhibitors, many of which were associated with favorable efficacy and safety profiles when treating patients with ERBB2-positive metastatic colorectal cancer. Conclusions and Relevance The results of this review suggest the ERBB2 receptor is a promising target for patients with metastatic colorectal cancer; however, to date, no therapies are approved for use in this patient population. Therefore, it is imperative to continue to work to address this unmet need so that patients with ERBB2-positive metastatic colorectal cancer have therapeutic options should they become refractory to treatment with standard therapies.
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Affiliation(s)
| | - Takayuki Yoshino
- Department of Gastrointestinal Oncology, National Cancer Center Hospital East, Kashiwa, Japan
| | - Rondell P Graham
- Division of Laboratory Genetics and Genomics, Division of Anatomic Pathology, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
| | - Salvatore Siena
- Niguarda Cancer Center, Grande Ospedale Metropolitano Niguarda and Department of Oncology and Hemato-Oncology, Università degli Studi di Milano, Milan, Italy
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Fencer MG, Davis CH, Spencer KR. Current Updates on HER2–Directed Therapies in Metastatic Colorectal Cancer. CURRENT COLORECTAL CANCER REPORTS 2022. [DOI: 10.1007/s11888-022-00475-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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18
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Mohamed AA, Lau DK, Chau I. HER2 targeted therapy in colorectal cancer: New horizons. Cancer Treat Rev 2022; 105:102363. [DOI: 10.1016/j.ctrv.2022.102363] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 02/18/2022] [Accepted: 02/19/2022] [Indexed: 12/18/2022]
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Xu K, Jiao X, Wang P, Chen C, Chen C. Isolation of circulating tumor cells based on magnetophoresis. CHINESE JOURNAL OF ANALYTICAL CHEMISTRY 2022. [DOI: 10.1016/j.cjac.2022.100058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Benedetti F, Stadlbauer K, Stadlmayr G, Rüker F, Wozniak-Knopp G. A Tetravalent Biparatopic Antibody Causes Strong HER2 Internalization and Inhibits Cellular Proliferation. Life (Basel) 2021; 11:life11111157. [PMID: 34833033 PMCID: PMC8624325 DOI: 10.3390/life11111157] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 10/18/2021] [Accepted: 10/27/2021] [Indexed: 11/16/2022] Open
Abstract
The overexpression of tyrosine kinase HER2 in numerous cancers, connected with fierce signaling and uncontrolled proliferation, makes it a suitable target for immunotherapy. The acquisition of resistance to currently used compounds and the multiplicity of signaling pathways involved prompted research into the discovery of novel binders as well as treatment options with multiple targeting and multispecific agents. Here we constructed an anti-HER2 tetravalent and biparatopic symmetrical IgG-like molecule by combining the Fab of pertuzumab with a HER2-specific Fcab (Fc fragment with antigen binding), which recognizes an epitope overlapping with trastuzumab. In the strongly HER2-positive cell line SK-BR-3, the molecule induced a rapid and efficient reduction in surface HER2 levels. A potent anti-proliferative effect, specific for the HER2-positive cell line, was observed in vitro, following the induction of apoptosis, and this could not be achieved with treatment with the mixture of pertuzumab and the parental Fcab. The inhibitory cytotoxic effect of our antibody as a single agent makes it a promising contribution to the armory of anti-cancer molecules directed against HER2-addicted cells.
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