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Spontaneous fibrosarcoma in a thymus-transplanted nude mouse
Journal of the National Cancer Institute
|June 1, 1977
Summary
A rare fibrosarcoma developed in a nude mouse with a thymus transplant, despite its T-cell deficiency. This finding challenges the immunosurveillance theory, which posits that T-cells prevent cancer development.
Area of Science:
- Immunology
- Oncology
- Animal Models
Background:
- Nude mice lack T-cell-mediated immunity, making them models for studying immune deficiencies.
- The immunosurveillance theory suggests that the immune system, particularly T-cells, prevents cancer development.
- Malignant neoplasms are generally considered rare in immunodeficient animal models.
Purpose of the Study:
- To report the occurrence of a fibrosarcoma in a T-cell deficient nude mouse.
- To investigate the implications of this finding for the immunosurveillance theory.
- To document tumor incidence in a specific nude mouse colony.
Main Methods:
- Observation of tumor development in a 6-month-old nude mouse.
- Neonatal thymus transplant in the observed mouse.
- Maintenance of the mouse colony under nearly pathogen-free conditions.
- Monitoring of tumor incidence in over 1,000 nude mice.
Main Results:
- A single case of fibrosarcoma was identified in one nude mouse.
- No tumors were found in over 1,000 control nude mice in the same colony.
- Mammary carcinomas were observed in heterozygous breeder mice within the colony.
Conclusions:
- The development of a fibrosarcoma in a T-cell deficient nude mouse is a rare event.
- This finding appears to contradict the immunosurveillance theory's prediction of cancer prevention by T-cells.
- Malignant neoplasms remain exceptionally rare in T-cell deficient animal models, despite this isolated case.