GSTM1 and cervical cancer: The Kaplan-Meier method was used to assess the importance of factors we have selected (age, stage of the disease, Hb blood level before treatment, size of cervix and lymph nodes evaluated on CT, irradiation dose and radiotherapy duration) influencing the overall survival, disease-free survival, local control and distant-metastases-free survival of patients with cervical cancer (Table 1).