PREDICTIVE FACTORS ASSOCIATED WITH GEFITINIB RESPONSE IN PATIENTS WITH ADVANCED NON-SMALL-CELL LUNG CANCER (NSCLC)

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Abstract

Background

A number of different clinical characteristics have been reported to singly correlate with therapeutic activity of epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors (TKIs) in advanced non-small-cell lung cancer (NSCLC). This study aimed to identify predictive factors associated with prognostic benefits of gefitinib.

Methods

EGFR gene typing in 33 advanced NSCLC patients received gefitinib (250 mg/day) were analyzed with mutant-enriched PCR assay. Gefitinib response was evaluated with potential predictive factors retrospectively.

Results

The overall objective response rate (ORR) and median progression-free survival (PFS) in the 33 patients treated by gefitinib were 45.5% and 3.0(2.0–4.0) months. The ORR and median PFS in EGFR gene mutation patients were significantly higher/longer than those in EGFR gene wild-type patients (P < 0.01). Similarly, the ORR and median PFS in non-smoker patients were significantly higher/longer than those in smoker patients (P < 0.05, P < 0.01, respectively). However, no difference for ORR and median PFS occurred between male and female patients. Logistic multivariate analysis showed that only EGFR mutated gene was significantly associated with the ORR (P < 0.01). Both EGFR mutated gene and non-smoker were the major factors that contributed to PFS (P < 0.05).

Conclusions

EGFR-mutated gene and non-smoker status are potential predictors for gefitinib response in NSCLC patients.

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