Animal model of para-aortic lymph node metastasis

Area of Science:

• Oncology
• Translational Research
• Animal Models

Background:

• Lymph node metastasis is a critical factor in cancer progression and patient prognosis.
• Developing reliable experimental models is essential for studying metastasis and evaluating anti-cancer therapies.

Purpose of the Study:

• To establish a reproducible experimental model of lymph node metastasis using intra-rectal implantation of human cancer cells in nude mice.
• To investigate the efficacy of uracil/tegafur (UFT) in suppressing rectal tumor growth and lymph node metastasis within this model.

Main Methods:

• Intra-rectal injection of four human cancer cell lines (TE-1, MKN-45, HT-29, MIAPaca-2) suspended in Matrigel into the submucosal layer of nude mouse rectums.
• Monitoring tumor development, para-aortic lymph node metastasis, and other distant metastatic sites.
• Administering uracil/tegafur (UFT) orally to evaluate its impact on primary tumor volume and lymph node metastasis.

Main Results:

• All tested human cancer cell lines successfully formed locally aggressive rectal tumors and led to para-aortic lymph node metastasis.
• The model did not produce distant metastases in organs such as the liver, spleen, lungs, or peritoneum.
• Oral administration of UFT significantly reduced primary tumor volume and inhibited lymph node metastasis.

Conclusions:

• The established intra-rectal implantation model in nude mice is effective for studying human rectal cancer lymph node metastasis.
• This model provides a valuable platform for evaluating the therapeutic potential of anti-cancer agents like UFT against rectal cancer metastasis.