CD5 and acute lymphoblastic leukemia: Table 4 shows the positivity rate in B-cell ALL and T-cell ALL groups, separated by sex and age groups. In B-cell ALL, the frequency of cases with positive expression of CD66c and CD34 was significantly different between adults and children. In T-cell ALL, this difference was seen in the expression of CD2, CD117 and CD5 (Table 4). When evaluating the antigenic expression in the white blood cell count groups, there is a significant difference in the expression of CD2 and CD5 (Figure 3).