GSTM1 and anemia (phenotype): HoLEP vs. TURP Greater drop in Hb levels in HoLEP group (p=0.1) Early postop complications: Anemia requiring blood transfusion (1 vs. 0) UTI (0 vs. 1) AUR requiring bladder catheterization (4 vs. 7) One-year postop complications: Anemia requiring blood transfusion (1 vs. 0) UTI (5 vs. 0, p=0.001) AUR requiring bladder catheterization (5 vs. 1, p=0.01)