When talking about whether talc is linked to cancer or not, it is important to distinguish between talc containing asbestos and talc which is asbestos-free. It is widely believed that talc, which contains asbestos, causes cancer if inhaled. The evidence for asbestos-free powder is less clear.
You may browse the web to know more about talc powder and ovarian cancer link. Researchers use two main types of research to understand whether a substance or exposure causes cancer.
Laboratory tests: In laboratory studies, animals are exposed to a substance (often in very high doses) to see if it causes tumors or other health problems.
Researchers can also expose the substance to normal cells in a laboratory vessel to see if it causes the kinds of changes seen in cancer cells. It's not always clear whether the results of this type of research will apply to humans, but laboratory tests are a great way to find out if a substance can cause cancer.
Human studies: Another type of study looks at cancer risk in different groups of people. Such a study could compare cancer risk in the substance-exposed group with the risk in the unexposed group or with what would be expected in the general population. However, it is sometimes difficult to understand what the results of this study mean, because many other factors can influence the results.
In most cases, no test alone will provide sufficient evidence. As a result, researchers usually look at laboratory and human tests to see if something is causing cancer.