Hi, The Stage 4 Lymphoma treatment can be done with respect to the type of Lymphoma the person has, medical history and the organs it has affected. The details you have given is limited, so, we can suggest the hospitals that you could take in consideration. 

Since you have not mentioned where you are from let me tell you some of the private and government hospitals in major metropolitan cities in India. It will be better if you consider the private hospitals because the patient is in stage 4 and requires urgent treatment. In case you consider economy wise, go for government hospitals. 

Hope your brother have a speedy recovery and hope my information helps you. You can find hospitals on our page - Cancer Hospitals in India.