Table II.

The staining of MMPs in two groups of patients.

	Type	Negative	Positive	Prevalence	P-value
MMP-2					0.003
	Low-grade MEC	22	12	35.29%
	Typical NSCLC	26	50	65.79%
MMP-7					0.172
	Low-grade MEC	20	14	41.18%
	Typical NSCLC	34	42	55.26%
MMP-9					0.028
	Low-grade MEC	22	12	35.29%
	Typical NSCLC	32	44	57.89%

MEC, mucoepidermoid carcinoma; NSCLC, non-small lung cancer; MMP, matrix metalloproteinases.