My father is suffering from Hodgkin lymphoma.First it was diagnosed 10 years back and he underwent chemotherapy treatment at Adyar Cancer institute and he got completely out of cancer.Again after 10 years it got relapsed,they have given 3 chemo cycles and the cancer is not responding to the chemo treatment.And they have told nothing can be done and advice some medicine.Now he is on cyclophosphamide and predinosolone. Is there any treatment further pls guide me