Pre-treatment FLT-PET parameters as a prognostic tool for patients with locally advanced recurrent nasopharyngeal carcinoma salvaged by carbon-ion radiotherapy: a pilot study - Hu, Jiyi; Yang, Zhongyi; Gao, Jing; Hu, Weixu; Yang, Jing; Qiu, Xianxin; Ma, Guang; Kong, Lin; Lu, Jiade J. (Annals of Translational Medicine, 2020)