GSTM1 and thrombocytosis disease: Hb levels (HR = 2.19; 95% CI, 1.12–4.26, p = 0.022) and thrombocytosis (HR = 2.60; 95% CI, 1.30–5.19, p = 0.007), were significantly correlated with PFS at univariate but not at multivariate analysis.