1123TiPA randomized phase II study of cisplatin plus radiotherapy versus durvalumab plus radiotherapy followed by adjuvant durvalumab versus durvalumab plus radiotherapy followed by adjuvant tremelimumab and durvalumab in intermediate risk, HPV-positive, locoregionally advanced oropharyngeal squamous cell cancer (LA-OSCC) (Canadian Cancer Trials Group HN.9). (23rd October 2018)