Allogeneic CARCIK-CD19 in Adults/Pediatric B-cell NHL or Chronic Lymphocytic Leukemia

This study is testing a CAR-T cell therapy called CARCIK-CD19 — where immune cells from a family member are engineered to attack cancer — in children and adults with B-cell blood cancers (including certain lymphomas and chronic lymphocytic leukaemia) who are not eligible for commercially available CAR-T treatments. **You may be eligible if...** - You are between 1 and 17 years old (child) or 18 years or older (adult) - You have been diagnosed with a mature B-cell blood cancer (NHL or CLL) confirmed by biopsy - You are not eligible for commercially available CAR-T cell therapies - You have a family member who is a partial or full HLA tissue match and willing to donate blood **You may NOT be eligible if...** - You are eligible for and willing to receive commercial CAR-T therapy - No suitable family donor is available - You have certain serious infections or organ problems Talk to your doctor to see if this trial is right for you.