Sex-Related Characteristics of Systemic Hormonal Homeostasis in Rats with Sarcoma C-45 Cells Transplanted to the Lung.

Sex-related systemic status of pituitary and thyroid hormones and cortisol was studied in rats on days 7 and 14 after transplantation of sarcoma C-45 cells into the lung. Females demonstrated slower development of the tumor process (49.0±10.7 vs. 32.0±3.9 days in males). Injection of tumor cells causes similar disorders in the levels of ACTH, thyrotropic hormone, and prolactin in males and females and opposite disorders in the thyroid and glucocorticoid homeostasis associated in males (in contrast to females) with reduction of cortisol level (by 1.9 times) and increase in the concentrations of total thyroxine forms (by 1.4 times) and triiodothyronine (by 2.9 times) by day 14. Early sex-related shifts in the status of hormone that are a component of the adaptive system attest to their possible relationship with different course of the malignant process in male and female rats.