[Methods for study of soluble antigens in pathological anatomy].

The authors restate their personal researches about several antigen systems, viz. ACE, neurospecific antigens. They point out the complementarity of immunochemistry and immunohistochemistry which implicates a very precise methodology and utilization of rigorously monospecific immune serums with regard to the studied antigen. This conduces to reproducible, responsive and reliable techniques in optic microscopy but much less easily so in electron microscopy. These techniques are still partly experimental; but their application to the study of pathological tissues and especially of tumors may however be considered. The identification of histological types and the correlated evolution is suggested on hand of concrete examples.