Stereological studies on chronic lymphocytic leukaemia and hairy cell leukaemia.

Using stereological techniques at the ultrastructural level, 7 quantitative parameters for 7 patients with hairy cell leukaemia, 27 patients with chronic lymphocytic leukaemia, and 8 normal individuals. These quantitative data show clear differences between normal lymphocytes, CLL cells and the abnormal cells of HCL. They also show that it may be possible to subdivide CLL into distinct groups on quantitative criteria.