This is an open-label, multicenter Phase 1b/2 study evaluating nanatinostat in combination with valganciclovir alone and in combination with pembrolizumab. Nanatinostat is a selective class I HDAC inhibitor which induces EBV early lytic phase protein generation, activating (val)ganciclovir to its cytotoxic form.~The Phase 1b dose escalation portion is designed to evaluate safety and to determine the recommended Phase 2 dose (RP2D) in patients with EBV+ RM-NPC. In Phase 2, up to sixty patients with EBV+ RM-NPC will be randomized to receive nanatinostat in combination with valganciclovir at the RP2D with or without pembrolizumab, to evaluate safety, overall response rate, and potential pharmacodynamic markers. Additionally, patients with other EBV+ solid tumors will be enrolled to receive nanatinostat in combination with valganciclovir at the RP2D in a Phase 1b dose expansion cohort.
This study will evaluate the safety efficacy of nanatinostat in combination with valganciclovir in patients with relapsed/refractory EBV-positive solid tumors and in combination with pembrolizumab in patients with recurrent/metastatic nasopharyngeal carcinoma