NPY1R and breast cancer: In ER− BC patients, higher NPY1R gene expression was not predictive of RFS [(HR = 0.8 (range: 0.64–1.01, logrank P = 0.055) (Fig. 6C) but was associated with better OS [(HR = 0.61 (range: 0.38–0.97, logrank P = 0.034)] (Fig. 6D).