Abstract
Advanced lung adenocarcinoma patients with epidermal growth factor receptor (EGFR) activating mutations usually are highly sensitive to EGFR tyrosine kinase inhibitors (TKIs), but whether EGFR-mutant lung adenocarcinoma is also responsive to pemetrexed-based chemotherapy remains controversial. We conducted a retrospective study to evaluate the efficacy and outcome of pemetrexed-based chemotherapy in advanced lung adenocarcinoma patients with different EGFR mutation statuses. Sixty-nine EGFR-mutant and 89 wild-type patients with advanced lung adenocarcinoma were enrolled. They all had received pemetrexed-based treatments. Chemotherapy objective response rate (ORR), median progression-free survival (mPFS), and thymidylate synthase (TS) expression levels of EGFR-mutant patients were compared with those of EGFR-wild-type patients. For the EGFR-mutant patients treated with first-line platinum/pemetrexed combinations, the ORR was significantly higher than that of the wild-type patients treated with similar regimens (43 vs. 21 %, p = 0.039). Nonetheless, for the patients treated with pemetrexed monotherapy, the difference in ORR was not significant between patients with EGFR mutations and those with wild-type EGFR in any line of treatments (in the first-line setting 20 vs. 13 %, p = 0.715; in the second-/third-line setting 13 vs. 8 %, p = 0.655). On the other hand, the mPFS for the EGFR-mutant patients treated with first-line combinations was also obviously prolonged (8.3 vs. 6.7 months, p = 0.004). However, among the patients receiving second-line platinum/pemetrexed combinations or any line of single-agent pemetrexed, there was no difference in PFS between EGFR-mutant and wild-type patients. Our results indicated that the efficacies and outcomes of pemetrexed treatment in advanced lung adenocarcinoma patients with EGFR activating mutations were similar to those in patients with EGFR-wild-type genotype, except in the setting of first-line platinum/pemetrexed combination chemotherapy.
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Acknowledgments
This work was supported by the National Basic Research Program of China (973 program, No. 2012CB9333004) and Tianjin Science and Technology Project (Crucial Special Anticancer Program, No.12ZCDZSY15600).
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Xiangli Jiang and Bo Yang contribute equally to this paper.
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Jiang, X., Yang, B., Lu, J. et al. Pemetrexed-based chemotherapy in advanced lung adenocarcinoma patients with different EGFR genotypes. Tumor Biol. 36, 861–869 (2015). https://doi.org/10.1007/s13277-014-2692-4
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DOI: https://doi.org/10.1007/s13277-014-2692-4