The clinical Significance of serum CD8 antigen levels in adult patients with Hodgkin's disease

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Abstract
Increased suppressor T-cell activity has been observed in patients with Hodgkin's disease. In order to evaluate the clinical significance of soluble CD8 antigen (sCD8), which is released from CD8+ suppressor/ cytotoxic T-lymphocytes, we determined sCD8 levels in the sera of 82 consecutive patients with newly diagnosed untreated Hodgkin's lymphoma who were entered into prospective trials of the German Hodgkin's Disease Study Group. sCD8 levels were significantly higher (p < 0.01) in stage IV (781 U/ml, n= 19) than in stages I-IIIB (443 U/ml; n =63). Patients with B-symptoms (n =36) had slightly higher levels (611 U/ml) than patients without (n 46) systemic symptoms (447 U/ml; p = 0.08). In 77 patients evaluable for response, the complete remission (CR) rate of patients with sCD8 < 750 U/ml was higher (54/60 or 90%) than that of patients with sCD8 > 750 U/ml 11/17 or 65%; p=0.01). The time to treatment failure was significantly longer in patients with sCD8 < 750 U/ml (p = 0.008), even among the group with stages 111B/IV only (p = 0.04). Our data suggest that the pretreat-ment levels of sCD8 in adult patients with Hodgkin's lymphoma have prognostic relevance, and that they should be determined especially in patients with advanced disease. Increased understanding of the role of sCD8 may shed light on the pathogenesis of Hodgkin's disease.