GSTM1 and anemia (phenotype): At the time of the initial assessment, he was noted to have a normochromic normocytic anaemia with a haemoglobin (Hb) of 109 g/L, mean corpuscular volume 84fL, platelet count 307 × 109/L, and white cell count (WCC) of 7.9 × 109/L with a normal differential.