### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
My Father,67 years, was diagnosed with NHL diffuse large B cell type lymphoma , about 2 months ago. Staged as 1. He was recommended 6 cycles of R-CHOP. He has completed 2. since the last 7-8 days he has been complaining of fever, initially low grade but over the last 3-4 days reaching to 99.5 and 100. fever subsides readily with paracetamol and he feels absolutely fit, but reoccurs after 5-6 hrs. He has no other complaint, no clear signs of infection. WBC count was 5000 about 5 days ago now it is 9000. Chest X ray is normal. Preliminary urine analysis is normal. Good appetite, no gastric complaints. He has been started on antibiotics (ceftum) 5 days ago but no relief. - could it be that the lymphoma is progressing and not being controlled by chemo?? - how to check that the chemo is really killing the cancer cells? that the disease is not progressing?

### output:

Hi!welcome to Chat Doctor! In most cases, the treatment for diffuse large B-cell lymphoma (DLBCL) is chemotherapy, usually with a regimen of 4 Chat Doctor.  This regimen, known as R-CHOP, is usually given for about 6 months. Rituximab is a type of biological therapy. Rituximab targets a protein known as CD20. CD20 is found on white blood cells called B cells. It is the B cells that are cancerous in the most common type of non Hodgkin lymphoma. Rituximab attaches itself to the B cells and marks them. The cells of the immune system recognize the marked cells and kill them. An increased risk of getting an infection from a 