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학술저널
저자정보
Ting Xu (Peking University Cancer Hospital and Institute Beijing China) Xicheng Wang (Peking University Cancer Hospital and Institute Beijing China) Ying Xin (The Medical Department 3D Medicines Inc. Shanghai China) Zhenghang Wang (Peking University Cancer Hospital and Institute Beijing China) Jifang Gong (Peking University Cancer Hospital and Institute Beijing China) Xiaotian Zhang (Peking University Cancer Hospital and Institute Beijing China) Yanyan Li (Peking University Cancer Hospital and Institute Beijing China) Congcong Ji (Peking University Cancer Hospital and Institute Beijing China) Yu Sun (Peking University Cancer Hospital and Institute Beijing China) Feilong Zhao (The Medical Department 3D Medicines Inc. Shanghai China) Depei Huang (The Medical Department 3D Medicines Inc. Shanghai China) Yuezong Bai (The Medical Department 3D Medicines Inc. Shanghai China) Jian Li (Peking University Cancer Hospital and Institute Beijing China) Lin Shen (Peking University Cancer Hospital and Institute Beijing China)
저널정보
대한암학회 Cancer Research and Treatment Cancer Research and Treatment 제55권 제2호
발행연도
2023.4
수록면
626 - 635 (10page)
DOI
10.4143/crt.2022.1058

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Purpose The human epidermal growth factor receptor 2 (HER2) is an established therapeutic target for various kinds of solid tumors. HER2 amplification occurs in approximately 1% to 6% of colorectal cancer. In this study, we aimed to assess the efficacy and safety of trastuzumab in combination with chemotherapy in HER2-positive metastatic colorectal cancer (mCRC). Materials and Methods An open-label, phase II trial (Clinicaltrials.gov: NCT03185988) was designed to evaluate the antitumor activity of trastuzumab and chemotherapy in HER2-positive digestive cancers excluding gastric cancer in 2017. Patients from this trial with HER2-positive, KRAS/BRAF wild-type, unresectable mCRC were analyzed in this manuscript. Eligible patients were treated with trastuzumab (8 mg/kg loading dose and then 6 mg/kg every 3 weeks) and irinotecan (120 mg/m2 days 1 and 8 every 3 weeks). The primary endpoint was the objective response rate. Results Twenty-one HER2-positive mCRC patients were enrolled in this study. Seven patients (33.3%) achieved an objective res-ponse, and 11 patients (52.4%) had stable disease as their best response. The median progression-free survival (PFS) was 4.3 months (95% confidence interval, 2.7 to 5.9). Four of the 21 patients (19.0%) had grade 3 adverse events, including leukopenia, neutropenia, urinary tract infection, and diarrhea. No treatment-related death was reported. Exploratory analyses revealed that high tumor tissue HER2 copy number was associated with better therapeutic response and PFS. Alterations in the mitogen-activated protein kinase pathway, HER2 gene, phosphoinositide 3-kinase/AKT pathway, and cell cycle control genes were potential drivers of trastuzumab resistance in mCRC. Conclusion Trastuzumab combined with chemotherapy is a potentially effective and well-tolerated therapeutic regimen in mCRC with a high HER2 copy number.

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