Comparative study of lipid composition and proliferative activity of rat cholangiocarcinoma RS1 and sarcoma M1 depending on the transplantation organ.

The proliferative activity and lipid composition (phospholipids, gangliosides) were studied in rat cholangiocarcinoma RS1 and sarcoma M1 transplanted subcutaneously or intrahepatically. The mitotic index was higher in the tumors transplanted into the heterologous organ. The total phospholipid and sphingomyelin contents were higher in the tumors transplanted intrahepatically. GM3 and GD3 were the main gangliosides in both variants of each tumor. A significant amount of GM3 ganglioside lactone was found in the intrahepatic variants whereas it was absent in the subcutaneous tumors. Both the mitotic index and lipid composition of the tumors studied depended on their microenvironment.