Objective:To evaluate the safety and efficacy of a palliative regimen with combining low-dose hyper-fractionated radiotherapy( LDHFR),as a chemo-potentiator,in relapsed and obstinate malignant solid tumors.Methods:Retrospectively study the safety and efficacy of 28 relapsed and obstinate carcinoma patients,who were treated by palliative regimen combining LDHFR,from May 2013 to April 2015.Acute adverse events were classified and graded by the radiotherapy sites and The National Cancer Institute( NCI) Common ...