Prognostic value of the 21-gene recurrence score in ER-positive, HER2-negative, node-positive breast cancer was similar in node-negative diseases: a single-center study of 800 patients

This study aimed to evaluate the prognostic significance of the 21-gene recurrence score (RS) in Chinese patients with pN0-1, estrogen receptor-positive (ER+), human epidermal growth factor receptor 2-negative (HER2−) breast cancer. Among 800 patients recruited between 2009 and 2016, the median RS was 24 (0 –69), with 27.4%, 46.8%, and 25.9% patients classified into low-, intermediate-, and high-risk groups. Cox regression analysis demonstrated that the high-risk category was associated with significantly higher odds of invasive disease-free survival (IDFS) and distant disease-free survival (DDFS) ev ents compared with the low-risk category (IDFS: HR = 2.450, 95% CI 1.017–5.902,P = 0.046; DDFS: HR = 2.829, 95% CI 1.013 –7.901,P = 0.047). No significant association between RS category and overall survival (OS) was found (intermediate vs. low: HR= 1.244, 95% CI 0.292 –5.297,P = 0.768; high vs. low: HR = 2.933, 95% CI 0.759 –11.327,P = 0.119). RS, as a continuous variable, was a highly significant predictor for IDFS (HR= 1.028, 95% CI 1.010 –1.047,P = 0.002), DDFS (HR= 1.030, 95% CI 1.010 –1.051,P = 0.003), and OS (HR= 1.034, 95% CI 1.007 –1.063,P = 0.014). Our findings suggested that RS may predict IDFS in Chinese patients with ER+/HER2− breast cancer with N0 or N1 disease.
Source: Frontiers of Medicine - Category: General Medicine Source Type: research