Lymphoma is typically diagnosed at an advanced stage but it's known to be a curable/treatable form of cancer. People's perception of cancer is usually based on the knowledge of solid tumour carcinoma. Lymphoma is a blood cancer and the different types are key. The type he has is the most common one, it's aggressive but quite curable. Indolent lymphoma is more survivable with a 90% 5-year survival rate at stage 4, but it's generally considered incurable w/o allo-HSCT (the type of transplant most often used in high-risk blood cancers such as adult acute leukaemia) .