Expression and prognostic value of MG7-Ag in patients with surgically resectable esophageal squamous cell carcinoma.
OBJECTIVE
MG7-Ag is a human gastric-carcinoma-associated antigen. The expression of MG7-Ag was found to increase gradually with the development and progression of gastric cancer. Moreover, a poorer prognosis was found in MG7-Ag positive gastric-carcinoma patients than in MG7-Ag negative patients. However, neither MG7-Ag expression nor its clinical significance has been previously examined in squamous cell carcinoma (SCC) of the esophagus. In this study, we examined the expression of MG7-Ag in esophageal squamous cell carcinomas to assess its value as a prognostic indicator.


METHODS
The expression of MG7-Ag was detected in 112 cases of esophageal squamous cell carcinoma (SCC) by immunohistochemical analysis. The relation of MG7-Ag staining with various clinicopathological features was statistically analyzed.


RESULTS
The staining of MG7-Ag was detected in SCC, while not in normal epithelial cells. In esophageal SCC, MG7-Ag was found significantly correlated with depth of invasion (P = .012), in T4, T3 carcinomas but not in T2, T1 carcinomas, lymph node metastases (P = .029), pathological stage (P = .005). Consistently, the survival rate tended to be statistically lower in patients with MG7-Ag positive SCCs than in MG7-Ag negative SCCs (P = .005). However, no significant difference was observed between MG7-expression and patient age, sex, tumor location, differentiation, distant metastasis, and lymphatic invasion.


CONCLUSIONS
MG7-Ag might play a positive role in the process of carcinogenesis and progression of esophageal SCC, and it could be considered as one valuable prognostic indicator in esophageal SCC.
Zhao
Yunping
Y
State Key Laboratory of Cancer Biology, Institute of Digestive Diseases, Xijing Hospital, Fourth Military Medical University, Xi'an, PR China.
Jiang
Yaoguang
Y
Wang
Ruwen
R
Zheng
Xiushan
X
Wang
Xin
X
Jin
Bin
B
Lu
Yuanyuan
Y
Qiao
Taidong
T
Hong
Liu
L
Fan
Daiming
D
D000951:Antigens, Neoplasm / Q000032:analysis*; D014408:Biomarkers, Tumor / Q000032:analysis; D002294:Carcinoma, Squamous Cell / Q000276:immunology* / Q000473:pathology / Q000601:surgery*; D016009:Chi-Square Distribution; D018450:Disease Progression; D004938:Esophageal Neoplasms / Q000276:immunology* / Q000473:pathology / Q000601:surgery*; D016629:Esophagectomy; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D016016:Proportional Hazards Models; D018709:Statistics, Nonparametric; D016019:Survival Analysis
D000951:Antigens, Neoplasm; D014408:Biomarkers, Tumor; C508753:MG7 antigen, human