A Study of BL-M24D1 in Patients With Locally Advanced or Metastatic Head and Neck Squamous Cell Carcinoma and Other Solid Tumors

This study is testing a new drug called BL-M24D1 in people with advanced head and neck squamous cell carcinoma (a type of cancer affecting the mouth, throat, or surrounding areas) or other solid tumors that have stopped responding to standard treatments. **You may be eligible if...** - You are 18 years or older (up to 75 for early phase) - You have locally advanced or metastatic head and neck squamous cell carcinoma or another solid tumor - You have at least one measurable tumor - Standard treatments have failed or you cannot tolerate them - Your heart, kidneys, liver, and blood counts are within acceptable ranges - You are generally in good health (ECOG score 0 or 1) **You may NOT be eligible if...** - You have active, uncontrolled brain metastases - You have severe heart problems - You are pregnant or breastfeeding - You have had recent major surgery or severe infections - You are on certain medications that may interact with the study drug Talk to your doctor to see if this trial is right for you.