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Chemotherapy of human tumors in T-lymphocyte-deficient mice
Abstract:
Human lung, ovarian, colonic, and renal carcinomas have been grown in mice artificially deprived of T-lymphocytes. All grew slowly and were shown to have a human karyotype even after several transplant generations. Their responses to chemotherapy were similar to the expected clinical response with the important exception of hexamethylmelamine which caused complete regression of two lung carcinomas (even when weighing up to 2.5 g at the start of treatment) and a renal carcinoma, while completely inhibiting the growth of an ovarian carcinoma and another lung carcinoma. Measurement of plasma carcinoembryonic antigen levels proved to be of value in assessing drug efficacy.
Insights
This study shows that T-lymphocyte-deprived mice can grow human carcinomas. Hexamethylmelamine demonstrated significant efficacy against these tumors, suggesting its potential in cancer treatment.
Area of Science:
- Oncology
- Immunology
- Pharmacology
Background:
- Human carcinomas (lung, ovarian, colonic, renal) were xenografted into T-lymphocyte-deprived mice.
- Tumor growth and karyotype stability were maintained across transplant generations.
Purpose of the Study:
- To evaluate the efficacy of chemotherapy on human carcinomas in an immunocompromised mouse model.
- To assess the role of hexamethylmelamine and plasma carcinoembryonic antigen (CEA) levels in drug response.
Main Methods:
- Xenotransplantation of human carcinomas into T-lymphocyte-deprived mice.
- Administration of chemotherapy, including hexamethylmelamine.
- Monitoring tumor growth and measuring plasma carcinoembryonic antigen (CEA) levels.
Main Results:
- Carcinomas grew slowly but maintained human karyotypes.
- Hexamethylmelamine induced complete regression in lung and renal carcinomas and inhibited ovarian carcinoma growth.
- Plasma CEA levels were valuable in assessing drug efficacy.
Conclusions:
- T-lymphocyte-deprived mice serve as a viable model for studying human carcinoma xenografts.
- Hexamethylmelamine exhibits potent anti-tumor activity against specific human carcinomas in this model.
- Plasma CEA is a useful biomarker for monitoring treatment response in these models.