Radioactive-induced tumors by phosphorus-32 as colloidal compound

Area of Science:

• Oncology
• Radiology
• Orthopedics

Background:

• Chromic phosphate labeled with 32P (32P-CP) is a radioactive agent investigated for treating articular diseases.
• Intra-articular injections deliver therapeutic agents directly into the joint space.
• Understanding the long-term effects and potential carcinogenicity of intra-articular radioisotopes is crucial.

Purpose of the Study:

• To evaluate the oncogenic potential of intra-articular 32P-chromic phosphate in a rat model.
• To determine the incidence and type of tumors induced by 32P-chromic phosphate injection.
• To assess the risk-benefit profile of using radioactive isotopes in treating joint diseases.

Main Methods:

• Adult Wistar rats received intra-articular injections of 32P-chromic phosphate in the knee joint.
• Animals were monitored for tumor development over an extended period (minimum 270 days).
• Tumor incidence, type, and presence of metastases were recorded.

Main Results:

• Tumors developed in 70% of the injected knee joints after a minimum latent period of 270 days.
• Squamous cell carcinomas were identified in five cases within the injection zone.
• Ten instances of lung metastases were detected, indicating systemic spread.

Conclusions:

• Intra-articular 32P-chromic phosphate demonstrates significant oncogenic potential in rats.
• The induction of squamous cell carcinomas and lung metastases underscores the risks associated with this treatment.
• Thorough risk-benefit assessments are essential before employing radioactive isotopes for articular disease treatment.