Table 5. Comparison of EGFR mutation between MPEs and matched MPTTs.

		MPTT
		+	−	Total
MPE	+	18*	4	22
	−	1	18	19
	Total	19	22	41

MPTT: metastatic pleural tumor tissue; MPE: malignant pleural effusion;

+: EGFR positive-mutation; −: EGFR negative-mutation.

*: among the 18 patients, one patient showed an exon 19 deletion in MPTT versus S768I mutation in the matched MPE-cell block.