The Paleo-oncology Research Organization (PRO) is the research leg of the Ancient Cancer Foundation (ACF), and is dedicated to facilitating and conducting research into the global history of cancer. PRO advocates multi-disciplinary collaboration and is committed to sharing data with other researchers and with the public. A more comprehensive description of ACF can be found at www.ancientcancerfoundation.org; and of PRO at www.cancerantiquity.org.