Study of Cryoablation and Nirogacestat for Desmoid Tumor

The primary purpose of this protocol is treatment. Systemic therapy with oral study agent, nirogacestat, will be given for 3 cycles (1 cycle = 28 days) followed by a single cryoablation procedure between Cycles 3 and 4, and then continued nirogacestat for Cycles 4 through 26. Treatment with nirogacestat may continue via this study for up to 24 months (26 cycles of treatment), unless there is progression of disease, intolerance, subject withdraws their consent, start of a new anticancer therapy, or until Subject Study Completion or Termination occurs.