8 males/2 females, age 29-59 y, with refractory/advanced CTCL...Pts are enrolled in sequential cohorts to receive durvalumab (fixed dose at 1500 mg) and dose escalation of lenalidomide...Detectable levels of PD-L1 but low levels of ICOS are observed in responding pts vs. high PD-L1 and ICOS levels in non-responders.