The combination of all significant prognostic parameters of OS from the multivariate analysis into a risk stratification model—including high tumor volume (TTV > 394.1 mL), elevated lactate dehydrogenase (LDH > 251 U/L), low hemoglobin (Hb < 11.9 g/dL), and the presence of visceral metastases—allowed for effective stratification of outcomes. Here, GSTM1 is linked to neoplasm.