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- W4361818096 abstract "<div>Abstract<p><b>Purpose:</b> <i>LKB1</i> loss is common in lung cancer, but no assay exists to efficiently evaluate the presence or absence of LKB1. We validated an IHC assay for LKB1 loss and determined the impact of LKB1 loss in <i>KRAS</i>-mutant non–small cell lung cancer (NSCLC).</p><p><b>Experimental Design:</b> We optimized and validated an IHC assay for LKB1 (clone Ley37D/G6) using a panel of lung cancer cell lines and tumors with known <i>LKB1</i> mutations, including 2 patients with Peutz–Jeghers syndrome (PJS) who developed lung adenocarcinoma. We retrospectively analyzed tumors for LKB1 using IHC from 154 <i>KRAS</i>-mutant NSCLC patients, including 123 smokers and 31 never-smokers, and correlated the findings with patient and tumor characteristics and clinical outcome.</p><p><b>Results:</b> LKB1 expression was lost by IHC in 30% of <i>KRAS</i>-mutant NSCLC (smokers 35% vs. never-smokers 13%, <i>P</i> = 0.017). LKB1 loss did not correlate with a specific <i>KRAS</i> mutation but was more frequent in tumors with <i>KRAS</i> transversion mutations (<i>P</i> = 0.029). <i>KRAS</i>-mutant NSCLC patients with concurrent LKB1 loss had a higher number of metastatic sites at the time of diagnosis (median 2.5 vs. 2, <i>P</i> = 0.01), higher incidence of extrathoracic metastases (<i>P</i> = 0.01), and developed brain metastasis more frequently (48% vs. 25%, <i>P</i> = 0.02). There was a nonsignificant trend to worse survival in stage IV <i>KRAS</i>-mutant NSCLC patients with LKB1 loss.</p><p><b>Conclusions:</b> LKB1 IHC is a reliable and efficient assay to evaluate for loss of <i>LKB1</i> in clinical samples of NSCLC. LKB1 loss is more common in smokers, and is associated with a more aggressive clinical phenotype in <i>KRAS</i>-mutant NSCLC patients, accordingly to preclinical models. <i>Clin Cancer Res; 21(12); 2851–60. ©2015 AACR</i>.</p></div>" @default.
- W4361818096 created "2023-04-05" @default.
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- W4361818096 date "2023-03-31" @default.
- W4361818096 modified "2023-10-17" @default.
- W4361818096 title "Data from Immunohistochemical Loss of LKB1 Is a Biomarker for More Aggressive Biology in <i>KRAS</i>-Mutant Lung Adenocarcinoma" @default.
- W4361818096 doi "https://doi.org/10.1158/1078-0432.c.6524763.v1" @default.
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