Table 2.

Id1 expression level in primary human lung adenocarcinomas versus squamous cell carcinomas. Expression level is average qRT-PCR signal for Id1/average signal for GAPDH × 10³ Primary NSCLC tumor specimens were evaluated for Id1 expression by qRT-PCR and expression levels for SCCs and AdenoCAs were compared.

Tissue type	Mean (SE)* Id1 expression	Tissue type	Mean (SE)* Id1 expression	P-value+
Adenocarcinoma	2.76 (0.16)	Squamous Cell Carcinoma	3.01 (0.22)	.41

*Natural log transformed mean and standard error (SE); ⁺ P-value based on two-sided two-sample t-test of hypothesis of no mean difference between tissue types.