The study looks at **Decoy20**, a new cancer treatment, both alone and with another drug, **Tislelizumab**, in adults with advanced solid tumors. A tumor is an abnormal growth of tissue that can be cancerous. The study checks how safe and effective Decoy20 is, by giving it in different doses to see if there are any bad side effects. It's a two-part study where the first part finds a safe dose and the second part tests this dose further.
**Key Points to Consider:**
- The study may last up to 1 year, with regular treatments and check-ups.
- Eligibility includes being 18 or older, with a specific type of advanced cancer.
- Participants must have tried all other treatments or have no other options.
Participants must be ready for frequent doctor visits and tests. There are risks like side effects from the drug, and certain health conditions may exclude someone from joining. If interested, you should discuss with your doctor if this study is right for you.