Toxicity and PRO analysis
toxicity, Cancer
ONCOLOGY, CANCER
Physician evaluated toxicity was assessed at baseline, end of RT, at 6, 12 and 18 months and 2, 3 and 5 years after the end of RT and graded according to the Radiation Therapy Oncology Group/European Organization for Research and Treatment of Cancer (RTOG/EORTC) scale [Due to the different scales of the questionnaires, the original scales of PCSS and NPCR 2008 were transformed from a 0–10-point numerical scale to a 4-point verbal scale, the same as were used in NPCR 2013. 0–1 were transformed to "No problem", 2–4 to "Small problems/few symptoms", 5–7 to "Moderate problems", and 8–10 to "Severe problems" [