GSTM1 and Cowden syndrome 1: Approximately the same difference was also detected in the minimum Hb value, from the time of admission to the postoperative unit and 24 hours postoperatively (9.1 ± 1.3 vs. 9.5 ± 0.9 gr/dL, p < 0.05, median values: 9.2 vs. 9.4 g/dL for the C and CS groups, respectively, 4).