[Establishment of a transplantable human rectal mucoid adenocarcinoma model in nude mice and study of its biological characteristics].

A model of transplantable human mucoid adenocarcinoma of rectum in BALB/C nu/nu nude mice (TNB 92), was established and 18 sub-transplantations were performed. The success rate of transplantation was 98% and the average tumor bearing life time of mice was 112 days. Histology and ultrastructures showed that the transplantable tumor retained the original structures of the human tumor. Chromosomal analysis of the tumor cells exhibited the same features of the human carcinoma and it also retained the function of secreting CEA. Frozen tissue of the tumor in liquid nitrogen after rehabilitation could be successfully retransplanted into nude mice again. It seems to be a useful model for further study of human rectal adenocarcinoma.