Grade is a way of grouping together types of lymphoma that are treated in more or less the same way. There are three grades of lymphomas: high, intermediate and low. When deciding on treatment, doctors usually group high and intermediate grades together. Low grade lymphomas are slower growing, chronic diseases. They are often controlled for many years with fairly mild chemotherapy. But they are less likely to be completely curable. High grade lymphomas are usually faster growing acute diseases that need more intensive treatment, but are more often curable.