STC2 and nasopharyngeal carcinoma: In a study with human nasopharyngeal carcinomas, after intensity-modulated radiotherapy, the incidence rate of residual tumours is 54.8% for patients with STC2 positive tumours, while it’s only 17.4% for those with STC2 negative ones, suggesting STC2 levels are correlated with the response of tumours to radiation therapy [38].