Cell-mediated immunity against digestive organ cancers : leucocyte migration inhibitory factor activity as an immunological parameter.

The present study was conducted to investigate the usefulness of the direct leucocyte migration agarose method for studying cell-mediated immunity in vitro. Comparative studies of the purified protein derivative (PPD) skin test and the leucocyte migration inhibition test (LMIT) in which PPD was used as test antigen indicated a significant qualitative and a weak quantitative correlation between these two tests. Furthermore a positive correlation was found between the LMIT and the macrophage migration inhibition test (MIT) using ultrasonicated authochthonous tumor antigen. Comparative studies of the LMIT, MIT, PPD skin and DNCB tests on the same patients showed that cases responding positively to the the PPD skin and DNCB tests tended to respond positively to the LMIT and MIT. Patients with digestive organ cancers were examined by the LMIT. With the advance of cancer, decreased positive test test rates were found. After gastric cancer operations the LMIT findings were divided into two groups: one type changed from positive to negative, and the other type changed from negative to positive. The former response was suggestive of a successful operation, and the latter response was suggestive of a non-curative operation. These results indicated that the direct leucocyte migration inhibition agarose test was useful investigating cell-mediated immunity.