The FDA once again is examining safety data related to the use of bisphosphonates. This time, the agency is reviewing conflicting reports regarding oral bisphosphonates and the risk for esophageal cancer.
http://www.aafp.org/online/en/home/publications/news/news-now/health-of-the-public/20110801bisphos-esophca.html
Possible Link Between Bisphosphonates, Esophageal Cancer Sparks FDA Review