A model developed by Barret et al. [14] to predict anaemia development in cancer patients initiating CT included the following variables as the most important factors: low initial Hb (≤12.9 g/dL in females, and ≤13.4 g/dL in males); cancer type other than gastrointestinal/colorectal cancer; treatment with platinum CT, and female gender. This evidence concerns the gene GSTM1 and anemia (phenotype).