Generally, staging describes where a cancer is located, if or where it has spread, and whether it affects other parts of the body. Unlike most solid tumors, there is no standard staging system for LGLL, T-PLL, ATLL, or Sezary syndrome. However, doctors still use diagnostic tests, such as those discussed in the Diagnosis section, to evaluate T-cell leukemia. This helps decide what kind of treatment is best and predict your prognosis the chance of recovery. Talk to the doctor for details on how you can evaluate your specific type of leukemia.