Radioprotective Effect of Chinese Herbal Medicine on Oral Mucositis

200 head and neck cancer patients who were scheduled for radiotherapy are randomly assigned at a 1:1 ratio to two arms: control group and those treated with Zi-Yin-Liang-Ge-San containing Rx. Scutellariae, Rx. Glycyrrhizae, Hb. Dendrobii, Rx. Ophiopogonis, and Hb. Menthae Haplocalycis from day 1 of radiotherapy. The study lasted at least 6 weeks and the clinical benefit was determined by onset, gradation of mucositis (Common Terminology Criteria for Adverse Events v5.0), oral pain (visual analysis scale) for each week during RT. Nutritional status, EORTC Quality of Life Core Questionnaire (QLQ-C30) and head and neck module (QLQ-H\&N35), Body Constitution Questionnaire (BCQ), and electrical body conductivity were evaluated before and after radiotherapy. Patient-Reported Outcomes version of Common Terminology Criteria for Adverse Events (PRO-CTCAE), serious adverse events, blood and biochemical analysis will be recorded to evaluate the safety.