Table 3.

Prevalence of the Main EGFR Exon 19 Deletion Sizes in the COSMIC Database (among 1531 Cases with Exon 19 Deletion or Complex-Deletion), in our TMA (among the 31 Cases with Exon 19 Deletion), and in our Clinical Data at MSKCC during the Year 2008 (among the 107 Cases with Exon 19 Deletion)

Size of EGFR exon 19 deletion	COSMIC*	MSKCC TMA	MSKCC clinical data
9 bp	6.6%	12.9%	2.8%
12 bp	0.2%	3.2%	2%
15 bp	75.5%	64.5%	65%
18 bp	15.2%	9.7%	29%
24 bp	1.4%	9.7%	1%

^*Total = 98.9%. Some cases with very rare deletion sizes are not included.