RecruitingBiological interventionPhase 1/2 Study of Intratumoral Injection of STX-001 in Advanced Solid Tumors as Monotherapy or in Combination With PembrolizumabPhase 1/2, Open-label, Multi-center, First-in-human Study of the Safety, Tolerability, Pharmacokinetics, Pharmacodynamics and Anti-tumor Activity of STX-001 Delivered by Intratumoral Injection in Patients with Advanced Solid Tumors as a Monotherapy or in Combination with Pembrolizumab. The study now includes a monotherapy cohort targeting visceral lesions and a separate Phase 2 monotherapy cohort for advanced melanoma.