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Polycyclic aromatic hydrocarbon exposure in oesophageal tissue and risk of oesophageal squamous cell carcinoma in north-eastern Iran.
- Source :
-
Gut [Gut] 2010 Sep; Vol. 59 (9), pp. 1178-83. Date of Electronic Publication: 2010 Jun 28. - Publication Year :
- 2010
-
Abstract
- Objective: To evaluate the association between polycyclic aromatic hydrocarbon (PAH) exposure in oesophageal epithelial tissue and oesophageal squamous cell carcinoma (ESCC) case status in an ESCC case-control study in a high-risk population in north-eastern Iran.<br />Methods: Tissue microarrays (TMAs) of non-tumoral oesophageal biopsies from patients with biopsy-proven ESCC and gastrointestinal clinic patients with no endoscopic or biopsy evidence of ESCC (control subjects) in a rural region in north-eastern Iran were immunohistochemically stained. Immunohistochemistry was performed using monoclonal antibodies 8E11 and 5D11 raised against benzo[a]pyrene (B[a]P) diol epoxide (BPDE)-I-modified guanosine and BPDE-I-modified DNA, respectively. Staining intensity was quantified by image analysis and the average staining in three replicates was calculated. The main outcome measure was adjusted ORs with 95% CIs for the association between antibody staining intensity and ESCC case status.<br />Results: Cultured ESCC cells exposed to B[a]P in vitro showed dose-dependent staining with 8E11 but not with 5D11. With 8E11, sufficient epithelial tissue was available in the TMA cores to analyse 91 cases and 103 controls. Compared with the lowest quintile of 8E11 staining in the controls, adjusted ORs for the 2nd to 5th quintiles were 2.42, 5.77, 11.3 and 26.6 (95% CI 5.21 to 135), respectively (p for trend <0.001). With 5D11, 89 cases and 101 controls were analysed. No association between staining and case status was observed (ORs for the 2nd to 5th quintiles were 1.26, 0.88, 1.06 and 1.63 (95% CI 0.63 to 4.21), p for trend=0.40).<br />Conclusions: Dramatically higher levels of 8E11 staining were observed in non-tumoral oesophageal epithelium from patients with ESCC than from control subjects. This finding strengthens the evidence for a causal role for PAHs in oesophageal carcinogenesis in north-eastern Iran.
- Subjects :
- Adult
Aged
Biopsy
Carcinoma, Squamous Cell chemistry
Carcinoma, Squamous Cell pathology
Case-Control Studies
Dose-Response Relationship, Drug
Esophageal Neoplasms chemistry
Esophageal Neoplasms pathology
Female
Humans
Image Processing, Computer-Assisted
Male
Middle Aged
Polycyclic Aromatic Hydrocarbons analysis
Tumor Cells, Cultured
Carcinoma, Squamous Cell chemically induced
Esophageal Neoplasms chemically induced
Polycyclic Aromatic Hydrocarbons toxicity
Subjects
Details
- Language :
- English
- ISSN :
- 1468-3288
- Volume :
- 59
- Issue :
- 9
- Database :
- MEDLINE
- Journal :
- Gut
- Publication Type :
- Academic Journal
- Accession number :
- 20584779
- Full Text :
- https://doi.org/10.1136/gut.2010.210609