Nonunion of the capitate.

A case of nonunion of the capitate of a 13-year-old girl is reported. Autogenous iliac bone grafting obtained union. At the 2-year follow-up, she had no complaints and had full motion of the wrist.

Histochemical and cytochemical study of butyrylcholinesterase activity in rat hepatocellular carcinomas induced by 3'-methyl-4-dimethylaminoazobenzene.

The activity of butyrylcholinesterase (BCHE), a liver fetal isozyme (Zone L-V) of a nonspecific esterase, was studied histochemically and cytochemically in rat hepatocellular carcinomas induced by 3'-methyl-4-dimethylaminoazobenzene (3'-Me-DAB). In normal adult rats, BCHE activity was very prominent in cells of the intestinal mucosa but was not detectable in the liver. On the other hand, in fetal rat liver, a few cells scattered throughout the organ were BCHE positive. 3'-Me-DAB induced poorly differentiated hepatocellular carcinomas showing an intense BCHE activity, especially in areas consisting of small tumoral cells proliferating in a sheet-like pattern. Surrounding noncancerous liver tissue was completely devoid of reaction products. Less-differentiated trabecular hepatocellular carcinomas also showed a positive reaction. On the other hand, well-differentiated hepatocellular carcinoma and hepatocellular carcinoma with an adenomatous pattern were barely stained, while areas of cholangiofibrosis were usually negative. Thus, in confirmation of a previous report, BCHE appears to be a positive marker of poorly differentiated hepatocellular carcinomas induced by 3'-Me-DAB. By electron microscopy, reaction products were demonstrated in the cisternae of the endoplasmic reticulum, in the nuclear envelopes, and sometimes on the cell surface of undifferentiated tumoral cells. The significance of the appearance of BCHE activity in hepatocellular carcinomas induced by 3'-Me-DAB is discussed.

A microsomal butyrylesterase appearing in rat livers during development, regeneration, and carcinogenesis, and after phenobarbital treatment.

A microsomal butyrylesterase (L-I) was purified from the livers of male W rats treated with phenobarbital, and an antiserum against this purified L-I was raised in a rabbit. By the Ouchteriony double-diffusion test, a precipitin line was observed between the anti-L-I antiserum and each Triton X-100 extract of livers during development, regeneration after partial hepatectomy, and carcinogenesis and of hyperplastic nodules and hepatomas, all of which revealed L-I in their esterase isoenzyme patterns. These precipitin lines exhibited esterase activity. The fusion of the lines of these tissue extracts and that of the purified L-I indicated the presence of an antigen site common to their esterases. The extracts of adult and fetal livers and also of hepatomas resembling fetal liver in the esterase isoenzyme pattern did not produce a precipitin line with anti-L-I antiserum.

Appearance of intestinal type of tumor cells in hepatoma tissue induced by 3'-methyl-4-dimethylaminoazobenzene.

Carcinoma tissues induced by 3'-methyl-4-dimethylaminoazobenzene were investigated both morphologically and biochemically. The most prominent histological pattern was an undifferentiated carcinomatous one. While this type of carcinoma, histologically, appeared to be due to a uniform population of cells, electron microscopic examination revealed that the carcinoma tissue was composed of many types of cells including cells that contained either the brush border or the mucous droplets seen in goblet cells. In addition, tumor cells that contain serotonin-like granules were noticed. An electrophoretogram of alkaline phosphatase in the tissue extract of this type of carcinoma revealed distinctly the presence of its intestinal isozyme. These findings evidently show that carcinoma induced by 3'-methyl-4-dimethylaminoazobenzene includes in addition to the cells differentiated toward hepatocytes or cholangiolar cells, those differentiated toward intestinal epithelial cells.

Immunofluorescent study on alpha-fetoprotein-producing cells in the early stage of 3'-methyl-4-dimethylaminoazobenzene carcinogenesis.

The study was carried out to identify alpha-fetoprotein (AFP)-producing cells in the hepatic tissue by immunofluorescent antibody techniques during the early stage of 3'-methyl-4-dimethylaminoazobenzene ingestion. After 1 to 3 weeks, cells fluorescent to AFP were undetectable in cholangiolar cells ("oval cells") and also in degenerated megalocytic hepatocytes. After 4 to 7 weeks AFP appeared in rat sera, and "transitional cells" and small hepatocytes proliferated markedly in the periportal areas of hepatic lobules. AFP was exclusively detected in the majority of the transitional cells and a small portion of the small hepatocytes. Some fluorescent cells appeared in small groups, and others were randomly distributed in the periportal areas. The typical oval cells and the megalocytic hepatocytes were not fluorescent. When AFP in sera became undetectable, the regenerated hepatocytes matured considerably and were not brightly fluorescent. In the hepatic tissue, where AFP-producing cells were observed by fluorescent antibody technique, hematopoietic cells were frequently observed but they were not fluorescent.