Table 2. Mutational events in ETP-ALL compared to non-ETP T-ALL.

Mutation Status		ETP-ALL	non-ETP T-ALL	P-value
TCR rearrangement	monoclonal	28 (41%)	66 (79%)	<.001
n = 153	polyclonal	40 (59%)	18 (21%)
NOTCH1	mut	10 (15%)	35 (41%)	<.001
n = 151	wt	56 (85%)	50 (59%)
FLT3 total	mut	24 (35%)	1 (1%)	<.001
n = 153	wt	44 (65%)	84 (99%)
FLT3 ITD	mut	15 (22%)	0 (0%)	<.001
	wt	53 (78%)	85 (100%)
FLT3 D835	mut	9 (13%)	1 (1%)	.003
	wt	59 (87%)	84 (99%)

P values were calculated by Pearson's Chi-square test and Fisher's exact test, respectively.