GSTM1 and leiomyoma: On the further assessment of RBC and Hb indices, most of the parameters were comparable between the groups except MCV as it was significantly lower in patients with intramural fibroids at 79.7% followed by patients with submucosal fibroids at 81.5% compared to 82.9% in the patients with the subserosal fibroid (p=0.03) (Table 3).