Lymphocyte abnormalities in untreated patients with Hodgkin's disease.

The study comprises 38 unselected and untreated patients with Hodgkin's disease (HD) and 23 healthy persons. Highly purified blood lymphocytes were analyzed for cells forming rosettes with sheep red blood cells (T lymphocytes), and lymphocytes bearing surface immunoglobulin (B lymphocytes) and/or carrying receptors for complement. Their DNA synthesis, spontaneously, or after activation with mitogens (phytohemagglutinin, concanavallin A, poke weed mitogen) and purified protein derivative (PPD) was measured. Delayed skin hypersensitivity to PPD and mumps antigen was studied. Most HD patients had low numbers of T lymphocytes (50% of the cases below normal range) while the mean B-lymphocyte level was normal but with a greater variation than in the control group. Lymphocytes from most patients were poorly stimulated by T-cell mitogens. Two-thirds of the patients and one healthy control had negative skin reaction to 2 TU PPD and the DNA synthesis of their lymphocytes after activation with PPD was low. Large lymphoid cells (greater than 9-mm diameter) were commonly present in HD blood and the spontaneous DNA synthesis was high, particularly in lymphocytes from stage B patients. The percentage of T lymphocytes and the stimulation of lymphocytes by T-cell mitogens or by PPD, a T-lymphocyte function, did not correlate and each test only detected defects in about half the cases. Simultaneous application of all tests revealed abnormalities of blood T lymphocytes in 33 out of 38 patients. Although the defects were usually more pronounced in patients with advanced disease, the impairment of T lymphocytes and their functions is present in all stages of Hodgkin's disease.