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ORAL 33 - ALK (ID 145)
- Event: WCLC 2015
- Type: Oral Session
- Track: Treatment of Advanced Diseases - NSCLC
- Presentations: 1
ORAL33.01 - Crizotinib Outcome and Post-Progression Management in ALK+ NSCLC: IFCT-1302 CLINALK (ID 1355)
16:45 - 18:15 | Author(s): R. Veillon
Phase III trials have demonstrated the superiority of the ALK tyrosine kinase inhibitor (ALK-TKI) crizotinib compared to standard chemotherapy in advanced ALK positive non-small cell lung cancers (ALK+ NSCLC) in first line and second line setting. Objective response rate (ORR) with crizotinib ranged from 65 to 75% and median progression free survival (PFS) from 7.7 to 10.9 months. However a resistance to crizotinib always occurs. The French Cooperative Thoracic Intergroup (IFCT)-1302 CLINALK study aimed to describe clinical outcome and post-progression management in a large cohort of French patients with ALK+ NSCLC treated with crizotinib.
IFCT-1302 CLINALK is a multicentric observational retrospective study. Patients with ALK+ NSCLC from centers of the IFCT network were included according to the main following criteria: advanced stage III or stage IV NSCLC, ALK immunochemistry (IHC) and/or ALK FISH positivity, crizotinib treatment in the setting of the French expanded access cohort program or as approved drug. Epidemiological and clinical data, crizotinib efficacy (objective response based on RECIST, PFS, overall survival (OS)), duration of treatment with crizotinib after disease progression and post progression outcome were collected on a case report form. The study inclusion period was from November 18 2011 to December 31 2013. The data cut-off was December 31 2014.
318 patients were included (median age 58.3, female 49.4%, caucasian 98.6%, non-smoker 55.1%, performance status 0/1 78.7%, adenocarcinoma 91.7%, stage III 14.5%, stage IV 85.5%, brain metastasis 35.9%). IHC was positive in 151/173 patients and FISH in 279/283 patients. Before crizotinib treatment, patients received platinum-based chemotherapy in 89% of cases and pemetrexed-based chemotherapy in 76.1%. Crizotinib was prescribed as first-line treatment in 17 patients (5.3%), second-line in 168 patients (52.8%), third-line in 58 patients (18.2%) and more than third-line in 75 patients (23.7%). Objective response was complete response in 1 patient (0.3%), partial response in 126 patients (40.0%), stable disease in 62 patients (19.7%) and progression in 58 patients (18.4%). ORR was 40.3 % (95%CI, 34.9-45.7). 262/318 patients presented progressive disease (82.4%) at time of analysis. Median PFS was 6.9 months (95%CI, 5.7-8.6). Median OS with crizotinib was 18.7 months (95%CI, 15.2-22.5). Median duration of treatment with crizotinib after disease progression was 56 days (29-203). Among 143 patients with subsequent treatments, crizotinib was rechallenged in 32 patients (22.4%). 58/143 patients (40.6%) were treated after crizotinib failure with another ALK-TKI, either alectinib (19/58, 32.8%) or ceritinib (40/58, 69.0%). The ALK-TKI sequence was crizotinib-alectinib in 18 patients, crizotinib-ceritinib in 39 patients and crizotinib-alectinib-ceritinib in 1 patient.
This retrospective study of 318 patients with ALK+ NSCLC showed a remarkable efficacy of crizotinib, with a 18.7 months median OS, a 40.3% ORR and a 6.9 months median PFS. However, ORR and mPFS were lower than those reported in phase III trials, which may be due to less stringent selection criteria. Analysis of predictive factors of response and survival including post-progression strategies will be presented.
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