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자료유형
학술저널
저자정보
정혜현 (서울아산병원) 정재호 (서울아산병원) 김정은 (서울아산병원) 안진희 (울산대학교) 정경해 (울산대학교) 김성배 (서울아산병원)
저널정보
대한암학회 Cancer Research and Treatment Cancer Research and Treatment 제54권 제2호
발행연도
2022.4
수록면
469 - 477 (9page)
DOI
10.4143/crt.2021.205

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Purpose In hormone receptor-positive, human epidermal growth factor receptor 2?negative metastatic breast cancer (HR+ HER2?MBC), the mainstay treatment options include cyclin-dependent kinase 4/6 inhibitors (CDK4/6i) and everolimus (EVE) in combination with endocrine treatment. This study aims to compare the outcomes of the following treatment sequences: CDK4/6i followed by EVE and EVE followed by CDK4/6i.Materials and Methods Data from HR+ HER2? MBC patients treated between January 2014 and November 2020 with both CDK4/6i and EVE were retrospectively analyzed.Results Among the 88 patients included in the study, 51 received CDK4/6i before EVE (C→E group), and 37 received EVE before CDK4/6i (E→C group) with endocrine treatment. More patients in the E→C group had endocrine resistance (13.7% vs. 40.5%), experienced palliative chemotherapy (7.8% vs. 40.5%), and were heavily treated (treated as ≥ 3rd line, 5.9% vs. 40.5%). Median overall survival was 46.8 months in the C→E group and 38.9 months in the E→C group (p=0.151). Median composite progression-free survival (PFS), defined as the time from the start of the preceding regimen to disease progression on the following regimen or death, was 24.8 months in the C→E group vs. 21.8 months in the E→C group (p=0.681). Median PFS2/PFS1 ratio did not differ significantly between groups (0.5 in the C→E group, 0.6 in the E→C group; p=0.775). Ten patients (11.4%) discontinued EVE, and two patients (2.3%) discontinued CDK4/6i during treatment.Conclusion Although the CDK4/6i-based regimen should be considered as an earlier line of treatment, CDK4/6i- and EVE-based treatments can be valid options in circumstances where the other treatment had been already given.

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