Fig. 4
From: Outcome of early stage Merkel carcinoma treated by exclusive radiation: a study of 53 patients
Overall survival according to treatment group. RT: external beam radiation therapy; Group A = Exclusive RT; Group B = Surgery + RT. There was no statistical difference, in the unadjusted (HR, 0.71, 95% CI 0.39–1.30) and adjusted model (HR = 1.05 CI 95% 0.42–2.61), between the overall survival rates in the two groups using Cox regression models. The rates of overall survival were estimated using the Kaplan–Meier method