[Reaction of inhibition of macrophage electrophoretic mobility in differential diagnosis of carcinomas].

The reactivity of the lymphocytes from 40 carcinoma patients and 19 patients without detectable malignancies was tested by means of the macrophage-electrophoresis-mobility (MEM) test exposing lymphocytes from one individual to a large spectrum of antigenic preparations. Besides the encephalitogenic protein (EP) and the carcino-embryonic antigen (CEA) hypertonic KCl-extracts from human cancer and normal tissues were used as antigens to be tested. When performed in such a complex manner, the MEM-test resulted in characteristic reaction patterns allowing one not only to discriminate between cancer and noncancer, but also to draw a conclusion in which organ a carcinoma has arisen. The characteristic "immunological tumor profiles", thus obtained, are obviously due to the existance of common antigens in carcinomas of the same tissue origin. The CEA seems to be another antigen of high diagnostic value in that system, since the lymphocyte response to CEA was restricted to patients with tumors of the colon, rectum and stomach. The results show for the first time that lymphocytes of the tumor patients mentioned are able to react to CEA. The human lymphocyte response to CEA seems to be far more cancer- and (or embryo-specific than the reactions obtained with xenogenic hyperimmune sera) which areused for the detection of CEA in human sera or plasma samples. The "immunological tumor profile" opens a new step of quality among the attempts to develop immunological tumor tests.