**Study Purpose**: This study is looking at a new medicine called ONO-4685 for people with a type of cancer called T-cell lymphoma that has come back or hasn't gone away after treatment. We're checking if it's safe and how well it works.
**Who Can Join?**: Participants must be 18 or older and have a confirmed diagnosis of certain types of T-cell lymphoma. They should have tried at least two other treatments before. Participants need to be well enough to take part and have at least a 3-month life expectancy. People with certain infections or other types of cancers, or those who have had specific treatments before, cannot join.
**Key Points**:
- **Length**: The study will require multiple visits over a period of time.
- **Safety**: Participants will be monitored closely for any side effects.
- **Eligibility**: Must meet specific health criteria and have tried other treatments.
**Note**: It's important to talk with your doctor to understand more about the potential benefits and risks before deciding to participate.
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