Univariate analysis identified a high tumor grade (G1+G2 versus G3, p = 0.002) 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) as poor prognostic factors for CSS in our study cohort (Table 2). Here, GSTM1 is linked to neoplasm.