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P1.01 - Advanced NSCLC (ID 757)
- Event: WCLC 2017
- Type: Poster Session with Presenters Present
- Track: Advanced NSCLC
- Presentations: 1
- Coordinates: 10/16/2017, 09:30 - 16:00, Exhibit Hall (Hall B + C)
P1.01-015 - Crizotinib in ROS1 Rearranged or MET Deregulated Non-Small-Cell Lung Cancer (NSCLC): Final Results of the METROS Trial (ID 9454)
09:30 - 16:00 | Author(s): F. Barbieri
Crizotinib is the standard of care in NSCLC with ALK rearrangement. Recent data showed that the drug is dramatically effective in patients with ROS1 rearrangement (ROS1[+]), with promising activity also in individuals with MET exon 14 mutations (MET[Ex14]) or MET amplification (MET[FISH+]).
The METROS is an Italian multicenter prospective phase II trial designed to assess the efficacy and safety of crizotinib in ROS1[+ ]or MET[Ex1][4 ]or MET[FISH][+ ]advanced NSCLC patients who failed at least 1 standard chemotherapy regimen. The co-primary end-point was response rate (RR) in cohort A (ROS1+: centrally confirmed ROS1 rearrangement) and cohort B (MET+: centrally confirmed MET[FISH][+ ]defined as ratio MET/CEP7 >2.2 or locally confirmed MET[Ex1]). Eligible patients received crizotinib at the standard dose of 250 mg BID orally.
At the data cut-off of April 30[th], 2017, both cohorts completed accrual. Among 498 screened patients, 52 accounted for the intent-to-treat population (ITT) and received at least 1 dose of crizotinib. Among them, 26 resulted ROS1[+], 16 MET[FISH][+] and 10 MET[Ex1]. Notably, 3 MET[Ex1] cases had concurrent KRAS mutation and 1 had concurrent MET gene amplification. No concomitant driver event was detected in the ROS1 cohort. Cohort A included individuals with adenocarcinoma, median age of 55 years (range 29-86), predominantly female (61%) and never smokers (54%). Cohort B included older subjects (median age 68, range 39-78), predominantly male (65%), current/former smokers (77%) and with adenocarcinoma (92%). In both cohorts, the vast majority of patients (85%) presented > 2 metastatic sites and crizotinib was mainly offered as second line treatment (74%). Time from end of first line therapy to crizotinib was 4.1 and 1.6 months for cohort A and B, respectively. In ITT population RR, median progression free-survival (PFS) and overall survival (OS) were 61.5%, 17.2 months and not reached in cohort A and 26.9%, 3.1 months and 5.3 months in cohort B, respectively. For cohort B, responses were observed in both MET[FISH][+] and MET[Ex1] (25% and 30%, respectively), with evidence of rapid progression in patients carrying MET[Ex1][/KRAS]. At present, for 2 MET+ patients assessment is pending. Therapy was generally well tolerated with no unexpected adverse event.
The METROS is the first prospective trial specifically conducted in ROS1+ or MET+ deregulated NSCLC. The study confirms remarkable efficacy of crizotinib in ROS1[+] NSCLC. Responses observed in the MET cohort were of short duration confirming aggressiveness of the disease and the urgent needs for innovative therapies.