An immunocompetent rectal cancer model to study radiation therapy

Area of Science:

• Oncology
• Translational Medicine
• Animal Models

Background:

• Rectal cancer (RC) presents significant challenges in preclinical research.
• Existing mouse models may not fully recapitulate human disease complexity or tumor microenvironment.
• Development of physiologically accurate models is crucial for effective therapeutic development.

Purpose of the Study:

• To establish a novel, immunocompetent mouse model for rectal cancer (RC).
• To enable rapid tumor organoid engraftment for accelerated preclinical studies.
• To create a model that accurately reflects human RC histology and tumor microenvironment.

Main Methods:

• Orthotopic transplantation of rectal cancer organoids into immunocompetent mice.
• Utilizing mechanical disruption for efficient tumor engraftment, omitting chemical agents like dextran sulfate sodium.
• Histological analysis to compare murine tumors with human RC and assess tumor microenvironment remodeling.

Main Results:

• Successful rapid engraftment of rectal cancer organoids was achieved.
• The developed RC tumors exhibited mucosal invasion and distant metastasis.
• Histological examination confirmed resemblance to human RC and demonstrated radiation-induced tumor microenvironment changes.

Conclusions:

• The described murine RC model offers a robust platform for studying rectal cancer pathogenesis.
• This model provides a more physiologically relevant system for preclinical efficacy testing of novel therapies.
• The accessible methodology facilitates wider adoption for advanced cancer research.