Duvelisib and Nivolumab for the Treatment of Stage IIB-IVB Mycosis Fungoides and Sezary Syndrome

PRIMARY OBJECTIVE: I. To determine the recommended phase II dose (RP2D) or maximum tolerated dose (MTD) of the combination of duvelisib with nivolumab in patients with advanced mycosis fungoides/Sezary syndrome (MF/SS). SECONDARY OBJECTIVES: I. To observe and record anti-tumor activity. Ia. To determine the overall response rate at four months to the combination of nivolumab and duvelisib. Ib. To determine the time to maximum response, best overall response rate, complete remission rate, and duration of response among responding patients. EXPLORATORY OBJECTIVES: I. To evaluate whether intra-patient changes in serum cytokines (soluble CD40L, TNF-beta, IL-17alpha, IL-15, CXCL13, IL-12p40) predict response to duvelisib in combination with nivolumab in cutaneous T-cell lymphoma (CTCL). II. To explore whether the combination of duvelisib and nivolumab changes the T-cell repertoire including T-cell receptor sequencing pre- and post- treatment with duvelisib and nivolumab in effort to better understand skin flare and other immunogenic reactions to this combination therapy. OUTLINE: This is a dose-escalation study of duvelisib in combination with fixed dose nivolumab followed by a dose-expansion study. Patients receive duvelisib orally (PO) once daily (QD) or twice daily (BID) on days 1-28 or days 1-14 and nivolumab intravenously (IV) over 30 minutes on day 1 of each cycle. Cycles repeat every 28 days in the absence of disease progression or unacceptable toxicity. Patients undergo positron emission tomography (PET)-computed tomography (CT) or CT scan at baseline. Patients also undergo punch biopsy and collection of blood samples throughout the trial. After completion of study treatment, patients are followed up every 6 months for 2 years.