There is no standard staging system for hairy cell leukemia.
Staging is the process
used to find out how far the cancer has spread. Groups are used in place of stages for hairy cell leukemia. The
disease is grouped as untreated, progressive, or refractory.
The hairy cell leukemia is newly diagnosed and has not been treated except to relieve signs or symptoms such as weight loss and infections. In untreated hairy cell leukemia, some or all of the following conditions occur:
In progressive hairy cell leukemia, the leukemia has been treated with either chemotherapy or splenectomy (removal of the spleen) and one or both of the following conditions occur: