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J. Fillinger
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P2.01 - Poster Session with Presenters Present (ID 461)
- Event: WCLC 2016
- Type: Poster Presenters Present
- Track: Biology/Pathology
- Presentations: 1
- Moderators:
- Coordinates: 12/06/2016, 14:30 - 15:45, Hall B (Poster Area)
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P2.01-039 - Prognostic Significance of Claudin Protein Expression in Histological Subtypes of Non-Small Cell Lung Cancer (ID 5947)
14:30 - 14:30 | Author(s): J. Fillinger
- Abstract
Background:
We have investigated the correlation between claudin (CLDN) protein expression and clinicopathological parameters as well as survival in histological subtypes of non-small cell lung cancer.
Methods:
137 pathologic stage I primary bronchial cancers including 49 adenocarcinomas of non-lepidic variants (ADC), 46 adenocarcinomas of lepidic variants (L-ADC), and 42 squamous cell carcinomas (SCC) were examined. Immunohistochemistry (IHC) using antibodies against CLDN1,-2,-3,-4,-7 proteins as well as semiquantitative estimation (IHC scores 0-5) were performed on archived surgical resection specimens.
Results:
Claudin IHC scores of L-ADC differed significantly from ADC (CLDN1: p=0.009, CLDN2: p=0.005, CLDN3: p=0.004, CLDN4: p=0.001, CLDN7: p<0.001, respectively) and SCC (CLDN1: p<0.001, CLDN3: p<0.001, CLDN7: p<0.001, respectively). Highly significant CLDN3-CLDN4 parallel expression could be demonstrated in ADC and L-ADC (p<0.001 in both), which was not observed in SCC (p=0.131). ADC and SCC showed no correlation with smoking, whereas in case of L-ADC heavier smoking correlated with higher CLDN3 expression (p=0.020). Regarding claudin expression and survival, in SCC significant correlation could be demonstrated between CLDN1 IHC positivity and better survival (p=0.038). In NSCLC as a whole, high CLDN2 expression proved to be a better prognostic factor when compared with cases where CLDN2 IHC score was 0-1 vs. 2-5 (p=0.009), however, when analyzed separately, none of the histological subgroups showed correlation between CLDN2 expression and overall survival.
Conclusion:
Our results demonstrated significant claudin expression differences not only between the SCC–ADC and SCC–L-ADC but also between the L-ADC and ADC histological subgroups, which strongly underlines that L-ADC represents a distinct entity within the ADC group. CLDN1 overexpression is a good prognostic factor in NSCLC, but only in the SCC subgroup.
