BCR and B-cell chronic lymphocytic leukemia: The BCR stereotypy was predominantly present in the IGHV-unmutated CLL subtype (13/15 patients, 86.7%), and the identified stereotyped BCRs were assigned to subset #1 (five patients), subset #3 (three patients), subset #5 (two patients), subset #31 (one patient), subset #99 (one patient), and subset #202 (one patient).