Cats with FeLV are 62 times more likely to develop lymphoma, and cats with both FeLV and FIV are 77 times more likely.[23] Younger cats tend to have T-cell lymphoma and older cats tend to have B-cell lymphoma.[24] Older cats tend to have gastrointestinal lymphoma without FeLV infection,[25] although tests more sensitive to low level FeLV infections and replication-defective FeLV have found that many of these cats have been previously exposed.[26] The same forms of lymphoma that are found in dogs also occur in cats, but gastrointestinal is the most common type.