This is a Phase 2a, double-blind, placebo-controlled, multi-center, randomized study of LSTA1 when added to standard of care (SoC) versus SoC alone in patients with advanced solid tumors. The study will include patients with advanced head and neck squamous cell carcinoma (HNSCC), esophageal squamous cell carcinoma (ESCC), and cholangiocarcinoma.~The study will consist of a screening period, a run-in period, a treatment period, an end-of-treatment follow-up visit, and a long-term follow up period.~Participants who provide informed consent will be screened for eligibility within 28 days prior to beginning the study treatment run-in period. Once eligibility is confirmed, participants will be randomized to one of the two treatment groups (SoC + placebo vs. SoC + LSTA1).~During the 3-day run-in period, participants will only receive the LSTA1 or placebo components of their randomized treatment regimen. After the 3-day run-in, Cycle 1 of treatment will commence. Tumor scans will be performed every 8 weeks (56 days ± 7 days) while on treatment.
The goal of this clinical trial is to test a new drug plus standard treatment compared with standard treatment alone in patients with advanced head and neck squamous cell carcinoma, esophageal squamous cell carcinoma, and cholangiocarcinoma.~The main questions it aims to answer are:~is the new drug plus standard treatment safe and tolerable~is the new drug plus standard treatment more effective than standard treatment