GSTM1 and carcinoma: Interestingly, we observed a preoperative Hb decrease of more than 0.6 g/dl in 55% of group A−, 75% of group A−,ID+,T+, 46% of group A+, and 45% in A−,ID+T+, which might be associated with a progressive decrement in bone marrow haematopoiesis, neo-adjuvant therapy, advancing age, or continuous blood loss, for example in carcinomas.