After adjusting for predefined and previously described confounders (ECOG, gender, age, smoking status, tumor stage, and chemotherapy use), Hb values before cystectomy did not reach significant values, whereas higher Hb values before TURBT were significantly associated with lower ACM (HR: 0.99, 95% CI: 0.98–0.99, p = 0.002) and DR (HR: 0.99, 95% CI: 0.99–0.99, p = 0.025). The gene discussed is GSTM1; the disease is neoplasm.