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M. Villamayor

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    P1.01 - Poster Session with Presenters Present (ID 453)

    • Event: WCLC 2016
    • Type: Poster Presenters Present
    • Track: Epidemiology/Tobacco Control and Cessation/Prevention
    • Presentations: 1
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      P1.01-004 - Is There Any Role of Residential Radon in Non Small Cell Lung Cancer (NSCLC) Patients Harboring Molecular Alterations? (ID 4770)

      14:30 - 15:45  |  Author(s): M. Villamayor

      • Abstract

      Radon gas is the first cause of lung cancer in non-smoking population. The World Health Organization (WHO) recommends radon concentration lower than 100 Bq/m3. In recent years, most of the advances in personalized therapy in NSCLC patients also occurred in non-smokers. Furthermore, limited information is available about the clinical and pathological characteristics in patients exposed to radon gas. We hypothesized that residential radon could be associated to some specific pathological and molecular alterations in NSCLC patients.

      Prospective study of a cohort of NSCLC patients harbouring molecular alterations (EGFR, BRAF mutations (m), ALK and ROS1 rearrangements (r)) in our centre, between September 2014 and October 2015. A radon detector alpha-track was given to each patient to measure residential radon concentration for 3 months; it was analysed using optical microscopy. We collected demographic information, smoking history, environmental exposure and clinical characteristics. The pathologic characteristics were prospectively revised by a lung cancer pathologist, including histology pattern, grade and inflammatory infiltrate. EGFR and BRAF mutation (m) were analyzed using quantitative real-time polymerase chain reaction (PCR) and ALK and ROS1 rearrangement by fluorescence in situ hybridization (FISH). Data was analyzed using IBM SPSS v.20.

      60 detectors were delivered (10% missing), 48 patients were evaluated (89.6% living in Madrid). Median age 66.5 (29- 82); 33 (68.8%) females; 33 non-smokers (31.3% passive smokers and 35.4% childhood exposure) and 3 (6.3%) light smokers. 100% adenocarcinoma (35.4% mixte, 18.8% acinar, 10.4% solid, 8.3% papillary, 8.3% micropapilllary, 8.4% others and 10.4% unknown); EGFRm 36 patients, ALKr 10 patients and BRAFm 2 patients. Home characteristics measured: 79.2% flat (89.1% measurement at bedroom); building material: 89.6% bricks. Median length of stay was 28 years (2-55). Median height of house 2 floors (0-15). Median of radon concentration: 104 Bq/m3 (42- 915); 60.42% over WHO recommendation. By molecular alteration: EGFRm median 96 Bq/m3 (42-915), ALKr median 116 (64-852) and BRAFm median 125 (125). A significant association was observed between non-EGFR mutation and concentration over the WHO recommendation (p=0.044). In univariant analysis, radon concentration was associated with non-mucinous histology and low tumoral grade (p=0.033 and p=0.023, respectively).

      Our final results have shown no consistent association between residential radon and molecular alterations in NSCLC patients, but a trend has been suggested in ALKr and BRAFm. Large multicenter studies are needed to confirm this hypothesis.