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J. Goldman
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MO18 - NSCLC - Targeted Therapies IV (ID 116)
- Event: WCLC 2013
- Type: Mini Oral Abstract Session
- Track: Medical Oncology
- Presentations: 1
- Moderators:L. Horn, J. Wolf
- Coordinates: 10/29/2013, 16:15 - 17:45, Bayside Auditorium B, Level 1
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MO18.02 - Preliminary clinical safety and activity of MK-3475 monotherapy for the treatment of previously treated patients with non-small cell lung cancer (NSCLC) (ID 2416)
16:20 - 16:25 | Author(s): J. Goldman
- Abstract
- Presentation
Background
Currently approved cytotoxic chemotherapies for previously treated patients with NSCLC demonstrate few objective responses, which are generally of short duration, with limited impact on progression-free survival and overall survival. Programmed death-1 (PD-1) is an inhibitory T-cell co-receptor whose activation by interaction with its ligands, PD-L1 or PD-L2, can lead to suppression of antitumor immunity. Preclinical and clinical data indicate that this pathway is important in NSCLC.MK-3475 is a humanized monoclonal IgG4 antibody against PD-1.Methods
MK-3475 was administered at 10 mg/kg every three weeks to patients with NSCLC previously treated with two systemic regimens. At least one measurable tumor lesion, ECOG performance status of zero or one, and adequate laboratory function were required for eligibility. A new tumor biopsy no earlier than 60 days before the first dose of MK-3475 was required for study entry. Imaging assessments per investigators were performed every nine weeks until confirmed disease progression utilizing the immune-related response criteria (irRC). Independent central review of images was assessed with RECIST v1.1. PD-L1 expression on the pretreatment tumor sample was determined by immunohistochemistry. A cut-point associated with the Youden Index of the receiver-operating characteristic curve for PD-L1 staining was identified.Results
Between April 2012 and September 2012, thirty-eight patients were enrolled. Median age was 63 years (range, 34-85 years), with 42% men and 42% with an ECOG performance status of zero. Previously treated, stable brain metastases were allowed and were present in 10%. Seven patients had an EGFR mutation, eight patients had a KRAS mutation, and one patient had an ALK gene rearrangement in their tumor. Fifty percent of patients experienced drug-related adverse events; the most common were fatigue, rash, and pruritus (16% each). The incidence of diarrhea was 13% (only grade 1 or 2 reported). One case of a drug-related grade 3-4 adverse event (grade 3 pulmonary edema: 3%) was seen. There were no drug-related fatalities. Using investigator-assessed irRC, the objective response rate (ORR; confirmed and unconfirmed) was 24%, including squamous and nonsquamous subtypes. Similar results were obtained using RECIST v1.1, yielding an ORR (confirmed and unconfirmed) of 21%. Most responses by irRC were observed by the time of first planned assessment at Week 9. The median duration of response by irRC has not been reached, with a median duration of follow-up of 9 months (minimum, 6 months). As of June 2013, seven of the nine responding patients by irRC continue on therapy. Pretreatment tumor PD-L1 expression was a statistically significant predictor of response. In patients with evaluable tumor PD-L1 expression, all confirmed responses by RECIST v1.1 (and irRC) occurred in patients with tumors strongly positive for PD-L1.Conclusion
MK-3475 is generally well tolerated in previously treated patients with advanced NSCLC and provides durable objective responses. An additional cohort of patients whose tumors express PD-L1 is enrolling; preliminary safety and efficacy data, including PFS and OS, will be reported further at the World Conference on Lung Cancer 2013.Only Members that have purchased this event or have registered via an access code will be able to view this content. To view this presentation, please login, select "Add to Cart" and proceed to checkout. If you would like to become a member of IASLC, please click here.
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MO21 - Prognostic and Predictive Biomarkers V - EGFR (ID 98)
- Event: WCLC 2013
- Type: Mini Oral Abstract Session
- Track: Medical Oncology
- Presentations: 1
- Moderators:D.C. Lam, S.M. Lee
- Coordinates: 10/30/2013, 10:30 - 12:00, Bayside Auditorium A, Level 1
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MO21.10 - Serial monitoring of plasma EGFR T790M levels and evaluation of EGFR mutational status in matched tissue and plasma from NSCLC patients treated with CO-1686 (ID 2498)
11:25 - 11:30 | Author(s): J. Goldman
- Abstract
- Presentation
Background
Background: We explored the minimally-invasive detection of EGFR mutations in circulating free DNA from plasma and studied the concordance of EGFR mutation status between matched plasma and tumor tissue in a cohort of newly diagnosed or relapsed patients with advanced NSCLC. CO-1686 is an oral, potent, small-molecule irreversible tyrosine kinase inhibitor that selectively targets mutant forms of EGFR, including T790M and the common initial activating mutations, while sparing wild-type EGFR. Promising clinical activity has recently been reported from an on-going Phase I/II trial.Methods
Methods: Matched tumor tissue and blood from 80 Stage IIIB/IV NSCLC patients, 41 treated with CO-1686, were tested using two allele-specific PCR assays, the cobas® EGFR FFPET and cobas® EGFR blood tests. Each test detects 41 mutations in EGFR, including the T790M resistance mutation, exon 19 deletions and L858R. We also used BEAMing, a highly quantitative and sensitive technology based on digital PCR, to assess a subset of 18 patients treated with CO-1686. BEAMing was compared to cobas analysis at baseline, and also used to serially monitor plasma EGFR mutation levels in response to CO-1686.Results
Results: Using tissue as reference, the positive percent agreement between tissue and plasma was 76% (44/58) for activating mutations and 63% (17/27) for T790M. The cobas® EGFR blood test identified two patients with T790M mutations in plasma that were not detected in the corresponding tumor biopsy—likely because of tumor heterogeneity. The M1a/M1b status was known for 63 EGFR mutation-positive patients. Of the 44 with extrathoracic metastatic disease (M1b), 38 were found to have an activating mutation in plasma (86%). Conversely, only 53% (10/19) of EGFR mutation-positive patients with intrathoracic metastatic disease (M1a) had detectable activating mutations in plasma (p = 0.0081). For the 18 patients profiled by BEAMing, the overall percent agreement between BEAMing and the cobas® EGFR blood test was 94% (17/18) for T790M and 83% (15/18) for activating mutations. Nine of the 18 patients had detectable baseline plasma T790M levels, and several patients treated with CO-1686 had an initial decrease in plasma T790M by BEAMing.Conclusion
Conclusions: Using the cobas® EGFR blood test, a high proportion of EGFR mutations identified in tissue were also detected in plasma. Mutations were more readily detectable in the plasma of patients with M1b rather than M1a disease. These findings suggest that the cobas® EGFR blood test and BEAMing can be useful tools for the non-invasive assessment and monitoring of EGFR mutations in NSCLC patients.EGFR mutation Evaluable patients Patients with tissue mutations* Patients with plasma mutations** Patients with same mutation detected in tissue and plasma Positive Percent Agreement*** L858R, del19, S768I, G719X, or ex20ins 80 58 44 44 76% T790M 80 27 19 17 63% * identified by the cobas® EGFR tissue test ** identified by the cobas® EGFR blood test ***agreement of blood and tissue mutation-positive results with tissue as reference; although tissue is reference, some mutations may be missed due to tumor heterogeneity Only Members that have purchased this event or have registered via an access code will be able to view this content. To view this presentation, please login, select "Add to Cart" and proceed to checkout. If you would like to become a member of IASLC, please click here.
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O03 - NSCLC - Targeted Therapies I (ID 113)
- Event: WCLC 2013
- Type: Oral Abstract Session
- Track: Medical Oncology
- Presentations: 2
- Moderators:J. Ross, J.C. Yang
- Coordinates: 10/28/2013, 10:30 - 12:00, Bayside Auditorium B, Level 1
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O03.01 - GALAXY-1: Randomized phase II study of docetaxel with or without ganetespib in advanced lung adenocarcinoma: Results in biomarker sub-groups and all adenocarcinoma patients. (ID 1715)
10:30 - 10:40 | Author(s): J. Goldman
- Abstract
- Presentation
Background
Ganetespib (G) is a highly potent 2[nd]-generation Hsp90 inhibitor showing synergistic activity with docetaxel (D) in NSCLC xenografts. G has a favorable clinical safety profile and has shown single-agent clinical activity in NSCLC patients with tumors harboring EML4-ALK translocations and KRAS mutations (mKRAS).Methods
We conducted a randomized, international open-label Phase 2 study of D with or without G in patients with advanced lung adenocarcinoma, one prior systemic therapy, and ECOG PS 0/1. D was given at 75 mg/m[2] on Day 1 of a three-week cycle in both arms. In the combination arm, G was given at 150 mg/m[2] on Days 1 and 15. The co-primary endpoints were PFS in patients with elevated LDH (eLDH) levels, or tumors harboring KRAS mutation. Key secondary endpoints were OS and PFS in all adenocarcinoma patients. Target enrollment was 240 adenocarcinoma patients, including 120 eLDH and 80 mKRAS patients. The study was initiated in all NSCLC patients and amended to include only those with adenocarcinoma histology.Results
Enrollment of 252 adenocarcinoma patients completed in November 2012; enrollment of eLDH (total N=112) and mKRAS (total N= 86) patients completed in May 2013. In all adenocarcinoma patients (N=252), baseline characteristics were balanced between the two arms (median age 60 years, males 56%, PS 0 41% and never-smokers 25%). Median numbers of cycles delivered were 6 and 4 for D+G and D, respectively. Grade 3/4 adverse events for the D+G and D alone arms were: neutropenia 37% vs. 38%; fatigue 6% vs. 3%; anemia 8% vs. 2%; diarrhea 3% vs. 0; fever with neutropenia 11% vs. 2%. A pre-specified analysis was conducted in May 2013. PFS HR for eLDH population (N=76) was 0.88 (90% CI: 0.57, 1.36, p=0.310); OS HR was 0.63 (90% CI: 0.40, 0.99, p=0.046). PFS HR for mKRAS population (N=63) was 0.83 (90% CI: 0.51, 1.37, p=0.271); and OS HR was 0.85 (90% CI: 0.48, 1.50, p=0.313). OS HR in the all adenocarcinoma population was 0.82 (90% CI: 0.62, 1.09, p=0.082), and the PFS HR was 0.84 (90% CI: 0.65, 1.07, p=0.038). For patients that were enrolled >6 months after diagnosis of advanced NSCLC (N=176), a pre-specified stratification factor, the OS HR was 0.61 (90% CI: 0.43, 0.87, p=0.0093), and the PFS HR was 0.61 (90% CI: 0.45, 0.83, p=0.0041). Final data analysis is expected by end of September 2013. Updated PFS and OS results for all populations will be presented at the meeting.Conclusion
Survival improvement was noted in all adenocarcinoma patients with the addition of ganetespib to docetaxel. The maximal benefit was achieved in patients with eLDH and those diagnosed with advanced NSCLC >6 months prior to study entry.Only Members that have purchased this event or have registered via an access code will be able to view this content. To view this presentation, please login, select "Add to Cart" and proceed to checkout. If you would like to become a member of IASLC, please click here.
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O03.06 - First-In-Human Evaluation of CO-1686, an Irreversible, Highly, Selective Tyrosine Kinase Inhibitor of Mutations of EGFR (Activating and T790M) (ID 1354)
11:25 - 11:35 | Author(s): J. Goldman
- Abstract
- Presentation
Background
Efficacy of existing EGFR tyrosine kinase inhibitors (TKIs) in NSCLC is limited by emergence of the T790M mutation in approximately 60% of patients, and significant skin rash and diarrhea, caused by wild-type (WT)-EGFR inhibition. CO-1686 is an oral, covalent TKI that targets common activating EGFR mutations and T790M, while sparing WT-EGFR. Animal models suggest greatest efficacy when plasma concentrations exceed 200ng/ml for >16hrs/day.Methods
This is an ongoing first-in-human dose finding study (3+3) of oral CO-1686 administered continuously in 21-day cycles. To be eligible, patients must have EGFR-mutant NSCLC and prior therapy with an EGFR TKI. All patients must undergo tumor tissue biopsy within 28 days before study drug dosing for central EGFR genotyping. Endpoints include safety, pharmacokinetics (PK), and efficacy.Results
As of 12 June 2013, 45 patients have been treated with CO-1686. 31/42 (74%) were T790M+; data for three patients is pending. The median age is 58 years, 82% are female, 75% are white, and 73% ECOG 1. The median number of previous therapies was 4 (range: 1- 6), with a median of 1 (range: 1- 4) previous EGFR TKI therapies. Dosing started at 150mg QD and escalated to 900mg QD, 900mg BID and 400mg TID, with a maximum tolerated dose not yet reached. Treatment-related AEs (all grades) occurring in > 5% patients were: fatigue (19%), diarrhea (15%), nausea (14%), anemia (10%), arthralgia (7%), muscle spasms (10%), myalgia (7%), headache (7%). The majority of events were mild or moderate. Unlike other EGFR inhibitors, rash and diarrhea were not commonly seen. This AE profile is consistent with the expected lack of wild type EGFR inhibition with CO-1686. The PFS for T790M+ patients with CO-1686 plasma concentrations > 200ng/mL for > 16 hours was 194 days compared with 72.5 days for those that achieved these concentrations for < 16 hours (Figure 1). At the highest evaluated dose, 900mg BID, four T790M+ patients were evaluable for response; 3 of the 4 achieved PRs, one achieved SD. One patient at a lower dose cohort also achieved a PR. Further safety and efficacy data will be presented at the meeting. Figure 1Conclusion
CO-1686 has demonstrated good tolerability and efficacy against proven T790M+ EGFR mutant NSCLC with a strong suggestion of a dose-response relationship. Additional evaluation of the optimal dose and formulation of CO-1686 are underway to further explore its potential for improved activity and better tolerability over other existing EGFR TKIs.Only Members that have purchased this event or have registered via an access code will be able to view this content. To view this presentation, please login, select "Add to Cart" and proceed to checkout. If you would like to become a member of IASLC, please click here.
