If ureteral obstruction is present, best method to allow delivering radio-chemotherapy treatment is nephrostomy, but you have to evaluate each clinical case individually. 

advanced cervical cancer is very common in our country, India. we assess the patient, if RFT is abnormal, we attempt stenting, antegrade/retrogade, if not feasible- for PCN. And continue with regular treatment of cervical cancer. many a time, they do respond well, that results in removal of PCN/stent

My teacher in Radiation Therapy warned me that uremia death is not too bad, as associated to blunted conscience, life expectation after a complete obstruction may be less than one week, so, his proposal was not to perform a nephrostomy in cases of incurable late-stage Gynecological malignancy obstructing lower pelvis, but I'm not aware of comparative results, and this is the kind of subject that must be discussed with patient, even if it is a hard task.

Regards, Salut +