[Clinical usefulness of 111In transferrin scintigraphy in colorectal cancer]

As assessment was made regarding the clinical value of 111In transferrin in scintigraphy on 28 lesions in 26 cases of colorectal cancer. The positive rate of colorectal cancer was high: 21 lesions out of the 28 (75%) were found to be positive. As for the location of cancer, there was a tendency for the positive rate to be high in the ascending and transverse colon. There was no obvious trend regarding Borrmann's classification, histological type, or macroscopic depth of invasion. There was a trend for cases in which the maximum diameter of the tumor was large and depth of invasion was in progress to be positive. Ten cases in which a specimen was resected were all shown to be positive by scintigraphy. Radioactivity in the tumorous regions was 4.41 +/- 2.96 times that of the non-tumorous regions. Moreover, tumorous tissue was strongly stained by the immuno-histological staining with anti-Tf.receptor antibody. From the above findings, it was considered that 111In transferrin is clinically useful in scintigraphy, since it is evident that it accumulates in the tissue of colorectal cancer.