MS4A1 and B-cell chronic lymphocytic leukemia: About half of patients (41, 43.6%) exhibited the most characteristic phenotype of the disease (CD5+CD23+FMC7−CD20lowsIglowCD79blow, B-CLL score: 5); among the rest, the majority (43 patients, 45.8%) displayed a B-CLL score of 4, with either FMC7+, or sIghigh, or CD79bhigh, while 10 patients (10.6%) had B-CLL score of 3 (CD5+CD23+ and CD20high and/or sIghigh and/or CD79bhigh, and/or FMC7+).