This study is testing a new drug, QXL138AM, for patients with **solid tumors** (cancers in organs like lung or breast) and **multiple myeloma** (a kind of blood cancer). It's a Phase 1 study, which means it’s the first time the drug is being tested in humans. The study will check if the drug is safe, how much should be given, and if it helps fight cancer. It is an open-label study, so both doctors and patients know what treatment is given. The study has two main parts: Part A to figure out the right dose, and Part B to see if the dose works well. Each part has two smaller groups based on the type of cancer.

• **Duration**: The study involves multiple visits over time, but specific length is not mentioned.
• **Compensation**: Information not provided, check with the study team.
• **Risks**: Possible side effects, as it is a new drug.