In:
Journal of Clinical Oncology, American Society of Clinical Oncology (ASCO), Vol. 31, No. 15_suppl ( 2013-05-20), p. e19023-e19023
Abstract:
e19023 Background: Gefitinib is now crucial in the treatment of EGFR-mutant NSCLC. Its anti-tumor activity could be modulated by MUC1 mucins [Cancer Res 2006], similar to KL-6 in the biochemical property, currently used as an indicator for interstitial lung diseases (ILDs). Our preliminary retrospective study showed the elevated serum KL-6 level is a potential negative prognostic value in pts with advanced NSCLC receiving gefitinib therapy [Lung Cancer 2008] . We conducted an observational study to evaluate this issue prospectively. Methods: Consecutive, EGFR-TKI-naïve NSCLC pts who were to receive gefitinib were enrolled and stratified by pretreatment KL-6 levels ( 〈 500 U/ml: normal group [NG] and ≥ 500 U/ml: abnormally elevated group [EG] ). The primary endpoint was overall survival (OS). The planned accrual number of pts was 150, assuming an estimated HR of 2.0, α=0.05, ß=0.10). We also evaluated ILD events during the gefitinib treatment. Results: Between 2007 and 2012, 154 pts were registered (NG: 89 [58%] and EG: 65 [42%] with median KL-6 score of 305 and 1,050 IU/mL, respectively). Those with pretreatment pulmonary fibrosis were similarly distributed between the groups. Median follow-up time was 13.7 months. The EG had significantly worse OS in the univariate analysis (log-rank p=0.0011), which was retained in the multivariate analysis (hazard ratio [HR]: 1.95, 95% confidence interval [95% CI] : 1.34-2.81). Exploratory analyses showed an interaction between EGFR-mutation status and KL-6; HR of KL-6 for OS: 1.96, [1.30-2.97], and HR: 4.80, [1.05-21.95] in pts with EGFR-mutant and wild-typed tumors, respectively (interaction p=0.07). As for ILD event it occurred similarly during the gefitinib therapy (HR: 2.76, [0.62-12.33]). Conclusions: The elevated KL-6 level could predict a poor prognosis in NSCLC pts with gefitinib therapy, and this association seemed modulated by EGFR-mutation status. Further studies are needed to clarify the biological behavior of KL-6 expression on tumor progression especially in the EGFR pathway.
Type of Medium:
Online Resource
ISSN:
0732-183X
,
1527-7755
DOI:
10.1200/jco.2013.31.15_suppl.e19023
Language:
English
Publisher:
American Society of Clinical Oncology (ASCO)
Publication Date:
2013
detail.hit.zdb_id:
2005181-5
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