AstraZeneca Clinical Hold Could Be No Real Concern, Or Very Bad For AZ And BMS

The partial clinical hold placed on a combination trial of AstraZeneca’s PD-L1 inhibitor durvalumab and CTLA-4 inhibitor tremelimumab could be a portent of problems for Bristol-Myers Squibb’s PD-1/CTLA-4 combination trials – or it could be related to the head and neck cancer setting.