from the PR: Of the 61 patients randomized, 46 patients met the cumulative radiation dose criteria of at least 55 Gy
Maybe people died in the meantime, couldnt take any more radiation ... all sorts of reasons why the number went to 46 (39 pp). This is a trial, things like that happen ... Consider this: 60% of the people did not get severe OM in the bril group!!! Ask them how they feel!