Yahoo! Finance featured a story on research published in the December 2014 issue of the Journal of Gastroenterology and Hepatology (link to research) that determined acetic acid may be effective in killing mesothelioma cells. According to the article, the Japanese researchers determined that an acetic acid concentration of 0.5% killed nearly all cancer cells after they were exposed for 10 minutes.
The actual research only mentions acetic acid, but the Yahoo! Finance story mentions that acetic acid is found in vinegar.