Abstract
The investigations of 400 adult hybrids from A/Jax fem. BALB/c male were aimed at answering the following questions: What is the influence of a generalized graft-versus-host-reaction (GVHR) on the induction and growth of benzpyrene-induced sarcoma? What is the behavior of B- and T-lymphocytes during GVHR, and during induction and growth of benzpyrene-induced sarcoma? Which are the deductions to be drawn with regard to the effect of B- and T-lymphocytes during tumorigenesis and tumor growth? The number of tumors was significantly greater in the GVHR animals (74.5%) than in the controls (49.5%). A significant decrease of T-lymphocytes and increase of B-lymphocytes during GVHR were found in the peripheral blood. The examination of the tumor marginal zone showed a marked decrease of the total round cell count and the T cells, while the count of B-lymphocytes remained uninfluenced. These results are discussed and compared with results of other authors.

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