Proteomic profiling of fetal esophageal epithelium, esophageal cancer, and tumor-adjacent esophageal epithelium and immunohistochemical characterization of a representative differential protein, PRX6

Table 3 Expression of PRX6 expression in esophageal tissues from fetuses of different gestational age n (%)

Age (mo)	PRX6
	No. of cases	Negative	Positive
3	6	0	6 (100)
4	4	0	4 (100)
5	6	1 (17)	5 (83)
6	6	0	6 (100)
7	5	1 (20)	4 (80)
8	6	1 (17)	5 (83)
9	6	2 (33)	4 (67)

P < 0.05, 3 mo vs 4 mo, 4 mo vs 7 mo, or 6 mo vs 7 mo.