ESR1 and anemia (phenotype): Our findings identified 25 indicators, including Gender, Surgery, Type of surgery, LYM%, MO%, LYM, BLT, TP, ALB, SF, K, CA, CREA, UA, PT, APTT, FIB, D‐dimer, CRP, hs‐CRP, ESR, PCT, IgA, CEA, and CA‐153, as independent risk factors for anemia.