RE:RE:RE:Merck ditches oncolytic virus Cavatak In cohort 2 of the AMBUSH Phase 1/2 study patients receive bortezomib SC or IV and dexamethasone either PO, IV, or IM on days 1, 8, and 15 of each cycle while also receiving pelareorep IV over 60 minutes on days 1, 2, 8, 9, 15, and 16 and pembrolizumab IV over 30 minutes on day 9 of each cycle. Treatment repeats every 21 days for up to 18 cycles in the absence of disease progression or unacceptable toxicity.