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Mammary tumors in splenectomized rats
G Kossoy1, H Ben-Hur, O Lifschitz
1The Laboratory of Experimental Oncology, Koret School of Veterinary Medicine, Faculty of Agricultural, Food and Environmental Quality Sciences, Hebrew University of Jerusalem, Rehovot, Israel.
Oncology Reports
|December 19, 2001
Summary
Splenectomy (surgical removal of the spleen) inhibited early mammary tumor development and reduced malignancy in rats. This suggests the spleen plays a role in chemical carcinogenesis.
Area of Science:
- Immunology
- Oncology
- Surgical Pathology
Background:
- The spleen is a key organ in immune regulation.
- Its role in chemical carcinogenesis, particularly mammary tumors, requires further elucidation.
Purpose of the Study:
- To investigate the impact of splenectomy on the immune response and mammary tumorigenesis induced by 9,10-dimethyl-1,2-benz(a)anthracene (DMBA).
Main Methods:
- Female rats underwent splenectomy or sham operation, followed by DMBA administration.
- Tumor development, latency, malignancy rates, and immune cell populations (CD4+, CD8+ T cells, NK cells) were analyzed.
Main Results:
- Splenectomy delayed tumor appearance and reduced malignancy rates (45% vs. 70%).
- Tumor burden and size were similar by study end.
- Splenectomized rats showed altered lymphocyte and increased natural killer cell populations.
Conclusions:
- Splenectomy inhibits early tumorigenesis and malignant transformation but does not halt overall carcinogenesis.
- The spleen's removal may enhance non-specific resistance, influencing DMBA-induced mammary tumor development.