KLK6 and B-cell chronic lymphocytic leukemia: Those 10 DEPs included CD44 antigen, Ig heavy chain V-III region TIL/TUR/WAS/POM, histidine-rich glycoprotein, Ig kappa chain V-III region CLL, apolipoprotein A-IV, kallistatin, and KLK6 (Fig. 2A).