Table 3. Comparison of EGFR mutation between MPE-cell blocks and matched MPTTs.

		MPTT
		+	−	Total
MPE-cell block	+	14*	4	18
	−	2	12	14
	Total	16	16	32

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

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

*: among the 14 patients, one patient showed an exon 19 deletion in MPTT versus S768I mutation in the matched MPE-cell block.