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- W4232138071 abstract "Abstract Background : The benefit of adjuvant chemotherapy in invasive lobular carcinoma (ILC) is still unclear. The objective of the current study was to elucidate the effectiveness of adjuvant chemotherapy in hormone receptor (HR)-positive, human epidermal growth factor receptor 2 (HER2)-negative, pT1b-c/N0-1/M0 ILC. Methods: Based on Surveillance, Epidemiology, and End-Results (SEER) database, we identified original 12334 HR-positive, HER2-negative, pT1b-c/N0-1/M0 ILC patients, who were then divided into adjuvant chemotherapy group and control group. End-points were overall survival (OS) and breast cancer-specific mortality (BCSM). Aiming to minimize the selection bias of baseline characteristics, Propensity Score Matching (PSM) method was used. Results : In a total of 12334 patients with HR-positive, HER2-negative, pT1b-c/N0-1/M0 ILC, 1785 patients (14.5%) were allocated into adjuvant chemotherapy group and 10549 (85.5%) into control group. Used PSM, the 1785 patients in adjuvant chemotherapy group matched to the 1785 patients in control group. By Kaplan-Meier survival analyses, we observed no beneficial effect of adjuvant chemotherapy on OS in both original samples ( P =0.639) and matched samples ( P =0.962), however, ineffective or even contrary results of adjuvant chemotherapy on BCSM both in original samples (P =0.001) and in matched samples ( P= 0.002). In both original and matched multivariate Cox models, we observed ineffectiveness of adjuvant chemotherapy on OS (hazard ratio (HR) for overall survival = 0.82, 95% confidence interval (CI) [0.62-1.09]; P =0.172 and HR=0.90, 95%CI [0.65-1.26]; P =0.553, respectively), unexpectedly promoting effect of adjuvant chemotherapy on BCSM (HR=2.33, 95%CI [1.47-3.67]; P =0.001 and HR=2.41, 95%CI [1.32-4.39]; P =0.004, respectively). Standard surgery was beneficial to the survival of patients. Lymph node metastasis was detrimental to survival and radiotherapy brought survival benefit in original samples, but two issues had unobvious effect in matched samples. Conclusion: In this study, adjuvant chemotherapy did not improve survival for patients with HR-positive, HER2-negative pT1b-c/N0-1/M0 ILC." @default.
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- W4232138071 date "2020-02-05" @default.
- W4232138071 modified "2023-09-27" @default.
- W4232138071 title "Adjuvant chemotherapy could not bring survival benefit to HR-positive, HER2-negative, pT1b-c/N0-1/M0 invasive lobular carcinoma of the breast: a propensity score matching study based on SEER database" @default.
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- W4232138071 doi "https://doi.org/10.21203/rs.2.16869/v3" @default.
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