WASHINGTON (Reuters) - Treating cancer with surgery, chemotherapy or radiation may sometimes cause tumors to spread and U.S. researchers said on Thursday they may have nailed down one of the causes -- a compound called TGF-beta.Tests in mice show that using the chemotherapy drug doxorubicin or radiation both raised levels of TGF-beta, which in turn helped breast cancer tumors spread to the lung.>>> Discuss This Story
