This study explores using a special radioactive drug called **LRRC15-targeted PET radiotracers** to help in the diagnosis and treatment of different cancers. **PET** stands for Positron Emission Tomography, a type of imaging used to look inside the body. The study involves two groups: patients with certain cancers and healthy volunteers. **For patients**, the goal is to diagnose cancer and understand its stage by comparing PET images with standard methods. This helps in deciding the best treatment. **For healthy volunteers**, the aim is to check how the drug moves in the body and ensure it's safe. **Key Points**: 1. **Duration**: Participants should be ready to commit to the entire study. 2. **Safety**: The study involves radiation, so it's important to understand the risks. 3. **Eligibility**: Both patients and healthy volunteers aged 18+ can participate, but certain health conditions may exclude you. **Inclusion**: Participants must agree to follow study rules and give consent. **Exclusion**: If you're pregnant, have certain allergies, or can't handle the tests, you can't join.