For OS, we found a significant association between an older age (<60 versus ≥60, p = 0.002), a high tumor grade (G1+G2 versus G3, p<0.001) and a low Hb level (<13 g/dl in males and <12 g/dl in females versus ≥13 g/dl in males and ≥12 g/dl in females, p<0.001) and poor clinical outcome (Table 3). This evidence concerns the gene GSTM1 and neoplasm.