(a): Classical immunophenotype for MCL shows high CD20 expression in conjunction with CD5. CD23 is typically negative, though can be dimly positive in up to 25% of cases. CD11c is very seldom positive, and may provide better diagnostic utility than CD23.1,2 (b) The translocation between 11q13 and 14q32 is defines the vast majority of cases, and is best identified by dual color FISH techniques.3,98,99,100