Purpose: To evaluate the efficacies of cyclophosphamide, methotrexate, and fluorouracil (CMF) and tegafur-uracil (UFT) as adjuvant therapy in patients with resected stage I-IIIA breast cancer by immunohistochemistry (IHC)-based subtype and to determine the relationships between clinicopathological factors and long-term outcomes.
Methods: A pooled analysis of the randomized controlled N·SAS-BC 01 and CUBC studies was conducted. Expression of hormone receptors (HRs; estrogen and progesterone receptors), human epidermal growth factor receptor 2 (HER2), and Ki67were assessed by IHC. Tumor-infiltrating lymphocytes (TILs) and nuclear/histological grades were determined by hematoxylin and eosin staining. Relapse-free survival (RFS) and overall survival (OS) were estimated by Kaplan-Meier analysis and hazard ratios were determined by Cox model adjusted for baseline tumor size and nodal status.
Results: A total of 689 patients (342 CMF and 347 UFT) were included in the analyses with a median follow-up of 11.1 years. There was no significant difference in RFS or OS between the two cohorts (RFS: 0.96 [95% confidence interval: 0.71-1.30], log-rank test p = 0.80; OS: 0.93 [0.64-1.35], p = 0.70). There was no difference in RFS or OS between the two cohorts for HR+/HER2- and HR+/HER2+ subtypes. RFS was significantly longer in patients treated with UFT compared with CMF in patients with HR-/HER2+ subtype (0.30 [0.10-0.88], p = 0.03). A high TILs level was associated with a better OS compared with low TILs level (p = 0.02).
Conclusions: This long-term follow-up study showed that RFS and OS were similar in patients with luminal-type breast cancer treated with CMF and UFT.
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| http://dx.doi.org/10.1007/s10549-020-06018-1 | DOI Listing |
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