Hi. I am supporting my Dad who has Diffuse Large B-Cell Lymphoma. He was diagnosed in November 2022, following loss of balance and a CT scan revealing a huge tumour in his head. Dad started intense chemo, but sadly it didn’t work. He was scheduled for a stem cell transplant but they cancelled this as told him in May last year her was terminal and they couldn’t cure. He was given Radiotherapy and this worked wonders, but given it was on the brain, he cannot have any further Radiotherapy treatment. He started a new chemo in Jan 24, this year, but this failed to reduce the tumours, and activity. He then asked about Glofitimab. It’s newly licensed on the NHS and generally offered after two failed systemic treatments. Dad started this in March, and it has significantly reduced the cancer activity on his latest PET scan. Ask the team about this drug - it may have a criteria, but it’s worth the ask. Another drug they considered was Ibrutinib. 
Don’t give up. There are always drugs being developed. Persist with asking your team. Sending my best wishes.