<正> DNA content of cells in effusion of 33 cases of mesothelial and adenocarcinomacells was measured by microspectrophotometer.The results showed that compared withmesothelial cells the DNA content of the suspected malignant cells was obviously increa-sed （P<0.01）

the DNA content of both highly and poorly differentiate adenocarcinomacells was obviously increased and statistically significant difference existed between them（P<0.01）;besides

aneuploidy could be found.It is objective

accurate and sensitive todetermine the character and differentiation degrees of adenocarcinoma cells in effusion byquantitaive analysis of DNA content with microspectrophotometer.