State of the evidence: A historical rat tumor model and cell experiments; these do not establish prevention of metastasis in people.
The frequently cited 1995 study
In a 1995 experiment, MCP reduced lung metastatic lesions in Copenhagen rats given prostate tumor cells, while primary tumor growth was unchanged.[1] Both parts of the finding belong in the account. Reporting only the metastatic result leaves an incomplete picture. The species should also remain visible in the main text, rather than requiring readers to discover it in a footnote.
Primary tumors and metastases are different endpoints
The primary tumor is the mass at the original site. Lesions found in another tissue are assessed as a different outcome. An intervention affecting one does not necessarily affect the other. Tumor size, spread and survival are not interchangeable concepts. A precise description identifies the endpoint and model instead of compressing the result into a broad statement that something works against cancer.
The model determines the interpretation
Introducing tumor cells into an animal creates a controlled research system. Human cancers vary in their biology, prior treatment and course. Behavior observed in one model cannot encompass all that variation. Findings can help researchers design appropriate follow-up experiments; they do not directly determine an individual's treatment. Generalizing one historical study to every cancer type would require evidence that the experiment cannot supply.
What a clinical benefit claim would require
A claim of metastasis prevention in people needs studies that actually assess that outcome in the relevant patient group. Comparison groups, follow-up duration and predefined outcomes matter. Cell-adhesion changes in a dish or lesion counts in animals cannot replace those human data. Using the same preparation and clearly identifying the administration route also helps establish which product a proposed conclusion concerns.
Research language and product claims
Terms such as potential and further investigation describe a stage of discovery. They do not mean treatment success has been established. Providing a citation does not automatically validate a promotional sentence either: the sentence must accurately reflect the cited experiment. Even when a paper has a strong title, the species and measured endpoint need to remain explicit for readers.
What patients can take from this
This experiment does not establish that MCP treats cancer or prevents metastasis in people. Anyone receiving cancer care should discuss supplements with their oncology team. An experimental finding is not a reason to delay or alter effective treatment. The purpose is to identify the study's contribution accurately: an animal experiment can generate a hypothesis, but cannot independently provide the human outcomes needed for a clinical recommendation.
References
This article provides general health information. Research findings about MCP are not individual recommendations for diagnosing or treating disease. Medicine and supplement use should be discussed with a doctor or pharmacist.
Published and sources assessed: 17 October 2026