In July 2024, the International Agency for Research on Cancer classified talc as "probably carcinogenic to humans," or Group 2A. The FDA and the National Cancer Institute describe the evidence on talc and ovarian cancer more cautiously. Here is what each body said, and why a hazard classification is not the same as proof of what caused one person's cancer.
What IARC decided
On July 5, 2024, IARC classified talc in Group 2A, "probably carcinogenic to humans." It based this on limited evidence for ovarian cancer in humans, sufficient evidence for cancer in experimental animals and strong mechanistic evidence that talc shows key characteristics of carcinogens. The evaluation appears in IARC Monographs Volume 136. (IARC press release)
IARC also noted two limits: asbestos contamination of talc could not be excluded in most of the human studies, and bias in how people reported their talc use could not be ruled out.
Hazard versus individual cause
IARC identifies hazards, meaning things that can cause cancer under some conditions. It does not estimate a particular person's risk, and it does not decide whether an exposure caused a specific person's cancer. "Limited evidence" means a link was seen but chance, bias or other factors could not be ruled out.
What the FDA says
The FDA says published studies going back to the 1960s have suggested a possible association between genital use of talc powders and ovarian cancer, but have not conclusively shown a link, and that more research is needed. (FDA)
What the National Cancer Institute says
The National Cancer Institute rates the evidence as inadequate. It says case-control and cohort studies are inconsistent, so the data are inadequate to support an association between perineal talc use and higher ovarian cancer risk. (NCI)
Why the agencies differ
They ask different questions and weigh studies differently. Case-control studies, which ask people with and without cancer about past use, have tended to report modest increases in risk. Cohort studies, which follow people forward in time, have generally not. Both kinds of studies have limits.
What this means for a claim
A classification does not decide whether talc caused any one person's cancer. In a legal claim, that question depends on the person's diagnosis, history, exposures and expert evidence. Our talcum powder page explains what attorneys may review.
This article is general information, not legal or medical advice, and reading it does not create an attorney-client relationship. Allegations in lawsuits are not findings of fact.
This article is general information about how these cases work. It is not legal advice, it does not create an attorney-client relationship, and no two claims are alike. If something here sounds like your situation, the useful next step is a conversation about the facts.