vaccination attenuated receipt live days durvalumab entry receiving tremelimumab prior vaccine live attenuated administration weeks study anticipation day cycle prior inactivated vaccines vaccination avelumab prohibited administration weeks dose trial influenza immunotherapy vaccines type tumor completion days weeks completed initiation oncolytic live receipt vaccine attenuated days dose prior study ip treatment vaccinated attenuated vaccines live weeks drug dose study starting tremelimumab vaccination live vaccine days prior start treatment minimum attenuated received live vaccines attenuated study days weeks vaccinations treatment prior vaccination