Fig. 1From: Characteristics and clinical course of thyroid abnormalities arisen in long term survivors of childhood cancerCumulative incidence in different treatment subgroups of childhood cancer survivors. The log-rank test showed a significant difference between different treatment groups. The irradiation group 1 had the highest event rate compared to the other treatment groups. Irradiation field of group 1 were head and neck, craniospinal irradiation, total body irradiation, cervical spine, nasopharynx, and mediastinum. The remaining irradiation fields (abdomen, pelvis, and limbs) were regarded as irradiation group 2Back to article page