[By NBC-1TV H. J Yook]The collaborative work of medical scientists and physicians across the globe has resulted in a major medical milestone: the world's 1 millionth blood stem cell transplant, a procedure that has become a proven and essential therapy for many patients battling blood cancers like leukemia and lymphoma, as well as other critical diseases.

The Worldwide Network for Blood and Marrow Transplantation (WBMT) announced the landmark achievement today. The WBMT—a nonprofit scientific organization whose mission is promoting excellence in stem cell transplantation, stem cell donation and cellular therapy—said the 1 millionth transplant occurred in late December 2012. The finding is based on data collected by WBMT international member organizations involved in blood stem cell transplantation, which were analyzed and verified by the WBMT.

“One million transplants is a milestone that may surprise many people, because blood stem cell transplants were viewed as a rare procedure until the last decade or so,” said Dietger Niederwieser, M.D., president of the WBMT and professor of medicine in the division of hematology and medical oncology at the University Hospital of Leipzig, Germany. “But important discoveries—and the vital cooperation of many scientists and physicians around the world—have dramatically improved outcomes for patients who undergo stem cell transplantation.”