From the beginning of radiotherapy to the end of th 1st , 2nd , 3rd month after radiotherapy , the morbidity of RSOM gradually increased and MEP decreased in the treatment group I , II and the control group , in which treatment group II showed the lowest morbidity of RSOM and MEP was maximum ( P < 0.01 ) , and the treatment group I showed the lower morbidity of RSOM and MEP was greater ( P < 0.05 ) , while the control group showed the highest morbidity of RSOM and MEP was minimum ( P > 0.05 ) .