Background: Afaitnib has shown anti-tumor activity against metastatic EGFR-mutated NSCLC after prior failure to first generation EGFR-TKI and chemotherapy. We prospectively evaluated the efficacy and safety of afatinib in Chinese patients who previously failed first-generation TKI and chemotherapy under a compassionate use program (CUP) and compared to the erlotinib cohort.
Methods: Patients who suffered from metastatic EGFR-mutated NSCLC previously responsive to first-generation TKI and chemotherapy received afatinib until progression, loss of clinical benefits or intolerable toxicity. Treatment response, survival and safety were evaluated and compared to the erlotinib cohort.
Results: Twenty-five and 28 patients received afatinib and erlotinib respectively. More patients in the afatinib group had worse performance status (ECOG 2) than the erlotinib group (p = 0.008). After a median follow-up of 12.1 months, afatinib demonstrated comparable objective response rate (ORR) (20.0% vs. 7.1%, p = 0.17) but significantly higher disease control rate (DCR) (68.0% vs. 39.3%, p = 0.04) compared to erlotinib. Median progression-free survival (PFS) (4.1 months [95% CI, 2.7-5.5 months] vs. 3.3 months [95% CI, 2.2-4.3 months], p = 0.97) and overall survival (OS) were not different between the two groups (10.3 months [95% CI, 7.5-13.0 months] vs. 10.8 months [95% CI, 7.4-14.2 months], p = 0.51). Multivariate analyses revealed that age ≤ 70 years and time to progression (TTP) ≥ 18 months for the 1st TKI therapy were prognostic of PFS (p = 0.006 and p = 0.008 respectively). Afatinib caused less rash (60.0% vs. 67.9%, p = 0.04) but more diarrhea (60.0% vs. 10.7%, p = 0.002) compared to erlotinib.
Conclusion: Afatinib produced encouraging clinical efficacy as 2nd TKI therapy with manageable safety profiles in our Chinese patients after failure to another TKI and systemic chemotherapy. This study was registered at ClinicalTrials.gov (NCT02625168) on 3rd December 2015.
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