4. Complete radiologic assessment in the form of CT scan at baseline and a CT scan after the third cycle of pembrolizumab followed by routine imaging every 6 weeks as is consistent with the standard of care for mRCC. 5. Routine laboratory analysis: basic metabolic panel (BMP), liver function panel (LFTs) and complete blood count (CBC), will be collected prior to each cycle of pembrolizumab administration and at the time of cryoablation and cytoreductive or partial/total nephrectomy.