A study published online in The Lancet suggests that patients who took certain drugs in an effort to keep inflammatory bowel diseases in remission may have a significantly higher risk of developing certain lymphomas.
What diseases were being treated?
Inflammatory bowel diseases such as Crohn's disease or ulcerative colitis.
What drugs were given?
Thiopurines such as Mercaptopurine (aka 6-mercaptopurine, 6-MP, Purinethol) and Azathioprine (aka Azasan, Imuran).