The reactivity of five monoclonal antibodise (McAbs) with nasopahary-ngeal carcinoma (NPC) ftissue and other carcinoma tissue was examined by indirect immuno-fluorescence. The distribution of cancer associated antigen was observed The results indicated that the positive reactions varied with different McAbs in 78.3%of H3, 84.21%of H4. 91.43% of H5, 67.5% of H12, and 70.27% of H13, In the characteristics of the fluoresc-ence staining, squamous carcinoma was different to adenocarcinoma. In H12 and H4, the rea...