BRCA1 and complete blood cell count: CRRM was correlated with a lower risk of CBC in UBC patients with germline pathogenic BRCA1/2 variants (summary RR = 0.07; 95%CI 0.03–0.13, I2 = 3%), a significantly increased OS (summary RR, 1.15; 95%CI 1.04–1.26, I2 = 26%) and a significantly increased BCSS (summary RR, 1.18; 95%CI 1.07–1.31, I2 = 64%) compared with surveillance.