This study is testing a new treatment called SynKIR-310 for people with a type of cancer called B-NHL (B-cell Non-Hodgkin Lymphoma). It is for those whose cancer has come back or didn't respond after trying other treatments. Participants will receive one IV dose (medicine given through a vein) to see if it is safe and works well. The study will include up to 18 people and will take place in different centers. Two groups will first try different doses to find the best one for future studies. Once the best dose is found, more people will join to help learn more about how the treatment works.
- The study involves a single infusion of SynKIR-310.
- Participants must be 18 or older and have tried at least two other treatments.
- Cannot have certain health issues like uncontrolled infections or heart problems.