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Chee Seng Tan
P1.01 - Advanced NSCLC (Not CME Accredited Session) (ID 933)
- Event: WCLC 2018
- Type: Poster Viewing in the Exhibit Hall
- Presentations: 1
- Coordinates: 9/24/2018, 16:45 - 18:00, Exhibit Hall
P1.01-38 - A Phase II With a Lead-In Phase I Study to Examine Safety and Efficacy of Hydroxychloroquine and Gefitinib in Advanced NSCLC (ID 11325)
16:45 - 18:00 | Author(s): Chee Seng Tan
Tyrosine kinase inhibitors (TKIs) benefit advanced non-small cell lung cancer (NSCLC) patients that harbor epidermal growth factor receptor (EGFR) mutations, but resistance invariably develops. Preclinical work demonstrated re-sensitization to EGFR-TKIs in cells with acquired resistance, and increased sensitivity of EGFR-mutant cells to erlotinib and hydroxychloroquine (HCQ) combination. We examine the safety and efficacy of HCQ with gefitinib in an Asian cohort of NSCLC patients.a9ded1e5ce5d75814730bb4caaf49419 Method
We enrolled stage IIIB/IV lung adenocarcinomas with sensitizing EGFR mutations. In the early phase of the study, non-smokers with unknown EGFR status were allowed. In the phase I lead-in study (Nov 2008-Jan 2010), maximum tolerable dose (MTD) of HCQ and gefitinib was ascertained via a 3+3 dose escalation schema.
In the phase II single-arm study (March 2010-May 2016), all patients were treated with gefitinib 250mg om and MTD (600mg om) of HCQ, and stratified into TKI-naïve and TKI-treated cohorts. In the TKI-treated cohort, patients must have prior response to gefitinib for more than 12 weeks and developed resistance. Primary end point (PEP) in the TKI-naïve cohort was objective response rates (ORR) and progression-free survival (PFS). In the TKI-treated cohort, PEP was ORR, and to determine if combination treatment can re-sensitize acquired resistance to EGFR TKIs.4c3880bb027f159e801041b1021e88e8 Result
75 patients were treated. EGFR mutations were identified in 77.3%. In the phase I cohort (n=13), MTD of HCQ was 600mg. HCQ-gefitinib combination was well tolerated. Common adverse events were rash and diarrhea, mainly from gefitinib. There was no dose-limiting toxicity. In TKI-naïve cohort (n=37) of the phase II study, ORR was 75.8% (95% CI 57.7-88.9). Median PFS was 9.4 months (95% CI 6.8-12.0). Four patients who were non-evaluable had early toxicities, including pneumonitis and hepatitis flare. In the TKI-treated cohort (n=25), 52% had received 2 or more lines of prior treatment. Disease control rate with TKI re-challenge was 50% (95% CI 21.9-70.9), ORR was 4.2% (95% CI 0.1-21.1). Median PFS was 2.4 months, and median overall survival was 9.9 months (95% CI 5.7-14.0). Three patients achieved a progression-free interval of more than 7 months after re-challenge (7.6; 11.2; 15.9 months).
Combination of HCQ-gefitinib is safe. In the TKI-naïve cohort, combination treatment did not improve PFS over reported average of 10 months for 1st-generation EGFR TKIs. However, in the TKI-treated cohort, re-responses and disease control to 1st-generation EGFR TKIs were seen, suggesting either a re-treatment effect or disease stabilization with addition of HCQ in acquired EGFR resistance.
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