<prompt> What is the most common cause of failure of radiotherapy for stage II cervical carcinoma?Liver metastasisBone metastasisPara-aortic node metastasisResistance of the central tumor  <response>: In stage II cervical cancer, the incidence of nodal involvement is 25-40. Most tumors are not radioresistant, and distant metastasis i.e., a more advanced stage are a late complication of more advanced stages of the disease. 