Table III.

Incidence of TdT-negative, CD34-negative and TdT/CD34 Double-negative ALL in present study and reported in other studies.

	Antigens	Present study results, n/N (%)	Other studies
	TdT-	41/843 (4.8)	11.4%25, 38%22
B-ALL	CD34-	314/833 (37.6)	41%26, 44%22
	CD34-/TdT-	23/826 (2.8)	5.7%25
	TdT-	35/206 (16.9)	28.5%25, 57%22
T-ALL	CD34-	149/200 (74.5)	78%22
	CD34-/TdT-	22/198 (11)	0.5%27

n/N: No. of cases lacking the tested expression/ Total no. of cases tested