Coordinated expression of the MHC class II genes and CIITA in 42 individual cases of PMBCL. The x-axis shows individual cases by study ID number, and the y-axis shows relative expression values. Cases with substantial, coordinated loss of MHC class II expression are marked with ↑. Cases are sorted as follows: from the left, patients who did not survive are plotted sorted by survival time, then patients who survived are plotted by follow-up time. The first surviving case is 1941.