The link between ovarian cancer and talcum powder was originally discovered in 1971 in a study that revealed talc particles in the ovarian tissue of cancer patients.
This was the first instance in which medical professionals realized women were at risk when using the powder on their genitals, sanitary pads, diaphragms, and in condoms. Talc particles easily made their way into the vagina and were able to travel deeper into the reproductive organs. One sample study demonstrated the ability of carbon particles to travel through the vagina and into the fallopian tubes in as little as 30 minutes, leading researchers to believe the same was possible with talc particles.
Despite the original findings and subsequent studies that have supported the original research, talc mining companies and Johnson & Johnson continue to argue against the connection citing insufficient evidence. The company has also managed to keep its product on the market without a warning for nearly half a century after the original discovery.