GSTM1 and anemia (phenotype): - Mild normocytic normochromic anemia (Hb 11.2 g/dL) - Low vitamin B12 (179 pg/mL), low vitamin D3 (21.4 ng/mL) - Mildly elevated total bilirubin (1.31 mg/dL) - Normal ESR, CRP, liver enzymes, pancreatic enzymes - Tumor markers (CEA, CA 19-9, AFP) within normal range - Viral markers and Tuberculin Skin Test (TST) negative