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MINI 26 - Circulating Tumor Markers (ID 148)
- Event: WCLC 2015
- Type: Mini Oral
- Track: Biology, Pathology, and Molecular Testing
- Presentations: 1
- Moderators:M. Macmanus, C. Aggarwal
- Coordinates: 9/09/2015, 16:45 - 18:15, 205+207
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MINI26.05 - Immunophenotyping of Circulating T Cells and TILs with Chemotherapy and Phased Ipilimumab in Non-Small Cell Lung Cancer (ID 2787)
16:45 - 18:15 | Author(s): N. Ready
- Abstract
- Presentation
Background:
Ipilimumab (Ipi) is a humanized CTLA-4 antibody that blocks binding of CTLA-4 with its cognate ligands, permitting T cell activation through CD28 binding. There is evidence that phased in Ipi added to chemotherapy (C) may enhance efficacy in non-small cell lung cancer NSCLC. This trial was undertaken to gain a better understanding of the changes that occur in T cells, regulatory T cells (Tregs), and myeloid-derived suppressor (MDSC) in both the blood and tumor micro-environment with CTLA-4 blockade.
Methods:
Patients with stage T > 4 cm and/or N1, N2 NSCLC were offered neoadjuvant carboplatin AUC6 plus paclitaxel 200 mg/m[2] every 21 days 3 cycles with ipilimumab 10 mg/kg day 1 cycles 2 and 3. Blood for immune profiling of circulating T cells was collected prior to cycle 1, after cycle 1 chemotherapy alone, and after cycle 3 chemotherapy plus Ipi. If patients underwent tumor resection and excess tumor was available, viable tumor infiltrating lymphocytes (TILS) were disaggregated and stored for later analysis. Phenotypic and functional polychromatic flow cytometry (PFC) analyses were performed on peripheral blood mononuclear cells (PBMC).
Results:
Blood was successfully collected at all 3 time points for the first 17/18 patients who initiated trial therapy. Excess tumor (0.96-5 gms) was collected on 5 patients and ample viable CD45+ TIL cells (9.4-26x10[6]) were isolated and viably cryopreserved. Phenotypic analyses revealed that both CD4+ and CD8+ cells from all 17 patients were highly activated following two cycles of ipilimumab (cycle 3) as evidenced by greatly increased frequencies of CD28, HLA-DR, PD-1, and intracellular CTLA-4 expressing cells. The frequencies of Tregs, defined by CD4+CD25+FoxP3+ expression, were highly variable among the 17 participants, with 8 showing increased Tregs, 7 showing decreased frequencies, and 2 remaining unchanged over the course of therapy. Seven of the 17 participants had levels of MDSC cells at or above 5%, with two patients achieving MDSC levels of 13% and 26.7%. Tumor associated antigen (TAA)-specific CD4+ or CD8+ cells were detected at baseline on 4 patients (24%), but their relative frequencies were unaltered by Ipi therapy. The most commonly recognized TAA was Survivin, followed by MAGEA3 and PRAME. No patients developed detectable de novo TAA reactivities while on Ipi therapy. We will report the phenotypic and functional parameters of TILs isolated from 5 tumors of the patients enrolled on the current trial at the time of presentation.
Conclusion:
TAA-specific CD4+ or CD8+ cells were unexpectedly detected in the blood at baseline in a subset of patients. We were able to determine what common NSCLC antigens the circulating CD4+ or CD8+ T cells were activated against, and this has the potential to be a blood based biomarker for trials studying immunotherapy such as vaccines. Neoadjuvant ipilimumab therapy neither facilitated the development of anti-TAA reactivities nor enhanced the frequencies of existing TAA-reactive T cells in PBMC. Neoadjuvant ipilimumab therapy effectively enhanced the frequencies of highly activated T cells, but had no consistent effect of the frequencies of Tregs.
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MINI 37 - SCLC Therapy (ID 165)
- Event: WCLC 2015
- Type: Mini Oral
- Track: Small Cell Lung Cancer
- Presentations: 1
- Moderators:D. Ettinger, G.R. Simon
- Coordinates: 9/09/2015, 18:30 - 20:00, 605+607
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MINI37.07 - PCI Survival Improvement for Extensive Stage SCLC Limited to Patients on Maintenance Systemic Therapy: A Secondary Analysis of CALGB 30504 (ID 861)
18:30 - 20:00 | Author(s): N. Ready
- Abstract
- Presentation
Background:
PCI has become standard of care for extensive stage small cell lung cancer (ES-SCLC) patients. However, one recent randomized study establishing this standard did not require brain imaging prior to enrollment, and another, which did, failed to show a benefit for PCI. CALGB 30504 (Alliance) was a randomized phase II study of sunitinib vs placebo in ES-SCLC patients responding to at least 4 cycles of platinum based therapy requiring baseline brain imaging at enrollment. As this study spanned the introduction of PCI for ES-SCLC, PCI was left to the discretion of the treating team. Therefore, we performed a secondary analysis of CALGB 30504 to determine the impact of PCI on ES-SCLC patients.
Methods:
CALGB 30504 was a phase II randomized study in ES-SCLC comparing maintenance sunitinib versus placebo following SD or CR/PR to 4-6 cycles of etopside 100 mg/m[2] d1-3 and either carboplatin AUC=5 or cisplatin 80 mg/m[2] d1 q 21 days. Sunitinib was 150 mg PO d 1 then 37.5 mg PO qd until progression. The primary objective was to determine if maintenance sunitinib would improve PFS, as was recently reported. PCI was recommended at 25 Gy in 2.5 Gy fractions, within 4-6 weeks of chemotherapy, but not required. Sunitinib was to be held 2 days prior, during, and 2 days after the completion of PCI. All statistical analyses were performed by the statisticians at Alliance/CALGB Statistical and Data Center on the platform of SAS (version 9.3; SAS Institution Inc., Cary, North Carolina).
Results:
85 patients received maintenance therapy(41placebo, 44 sunitinib). 41 (48%) received PCI, 44 didn’t. All patients and tumor characteristics were balanced between PCI and no-PCI patients. PCI dose was 25 Gy for 31 patients (range: 25-37.5 Gy). Median time to PCI was 21 wks (range: 12-27 wks) from enrollment. For all patients, PCI was associated with an improvement in PFS (median 7.8 vs 6.5 mo HR=0.63 (95% CI: 0.41-0.98), p=0.037), but not OS (median 12.9 vs 13.2 mo, HR=1.01 (95% CI: 0.64-1.62), p=0.955). In placebo patients, there was no PFS or OS difference between patients receiving PCI or not. In patients randomized to sunitinib, PCI conferred a PFS benefit (9.7 vs 6.8 mo, HR=0.49 (95% CI: 0.26-0.92), p=0.024), but not an OS benefit (14.1 vs 13.5 mo, HR=0.85 (95% CI: 0.44-1.66), p=0.636). When restricted to patients who did not receive PCI, there was no difference in survival between sunitinib or placebo patients. In PCI patients, those receiving sunitinib had non-significant improvement in PFS (9.7 vs 6.7 months, HR=0.63 (95% CI: 0.34-1.20), p=0.158) and trended towards an improvement in OS (14.1 vs 10.6 months, HR=0.56 (95% CI: 0.29-1.10), p=0.087), which was magnified and approached significance when crossover patients were excluded (14.1 vs 10.0 mo, HR=0.49 (95% CI: 0.22-1.06), p=0.064).
Conclusion:
PFS, and trends for OS improvement were limited to patients receiving the combination of PCI and maintenance sunitinib. Placebo patients did not benefit from PCI. Improved outcomes for ES-SCLC patients with PCI are likely limited to patients who achieve both intracranial and extracranial disease control.
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ORAL 02 - PD1 Axis Immunotherapy 2 (ID 87)
- Event: WCLC 2015
- Type: Oral Session
- Track: Treatment of Advanced Diseases - NSCLC
- Presentations: 3
- Moderators:E.B. Garon, H.J. Ross
- Coordinates: 9/07/2015, 10:45 - 12:15, Four Seasons Ballroom F1+F2
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ORAL02.01 - Phase 3, Randomized Trial (CheckMate 017) of Nivolumab (NIVO) vs Docetaxel in Advanced Squamous (SQ) Cell Non-Small Cell Lung Cancer (NSCLC) (ID 736)
10:45 - 12:15 | Author(s): N. Ready
- Abstract
- Presentation
Background:
Treatment options for patients with advanced SQ NSCLC who fail platinum-based doublet chemotherapy (PT-DC) are limited. NIVO, a fully human IgG4 programmed death-1 (PD-1) immune checkpoint inhibitor, demonstrates activity across NSCLC histologies and is approved in the US for treatment of metastatic SQ NSCLC with progression on or after platinum-based chemotherapy. We report results from a randomized, open-label, global phase 3 study (CheckMate 017; NCT01642004) comparing NIVO vs docetaxel in patients with previously treated SQ NSCLC and disease progression during/after one prior PT-DC regimen.
Methods:
Patients (N=272) were randomized 1:1 to receive either NIVO 3 mg/kg every 2 weeks (Q2W; n=135) or docetaxel 75 mg/m[2] Q3W (n=137) until disease progression or discontinuation due to toxicity or other reasons. For NIVO patients, treatment after initial progression was permitted at the investigator’s discretion, per protocol criteria. The primary objective was overall survival (OS). Secondary objectives included investigator-assessed objective response rate (ORR; per RECIST v1.1), progression-free survival (PFS), efficacy by PD-L1 expression (PD-L1 testing not required for enrollment), patient-reported outcomes (PRO), and safety. PRO analyses are presented in a separate abstract.
Results:
Treatment with NIVO led to 41% reduction in risk of death (hazard ratio [HR]=0.59; 95% CI: 0.44, 0.79; P=0.00025) and improved ORR (20% vs 9%; P=0.0083) and PFS (HR=0.62; 95% CI: 0.47, 0.81; P=0.0004) vs docetaxel (Table). Twenty-eight patients were treated with NIVO beyond initial progression, nine of whom demonstrated a non-conventional pattern of benefit (ie, reduction in target lesions with simultaneous appearance of new lesions, initial progression followed by tumor reduction, or no further progression for ≥2 tumor assessments). Across pre-specified cut-points (1%, 5%, and 10%), PD-L1 expression was neither prognostic nor predictive of benefit. OS HRs favored NIVO across most predefined patient subgroups. Grade 3–4 drug-related adverse events (AEs) were reported in 7% (9/131) of NIVO and 55% (71/129) of docetaxel patients. Grade 3–4 drug-related select AEs are shown below (Table). No deaths were related to NIVO vs 3 docetaxel-related deaths. Figure 1
Conclusion:
CheckMate 017 achieved its primary objective, demonstrating clinically superior and statistically significant OS with NIVO vs docetaxel in patients with advanced, previously treated SQ NSCLC. Benefit was seen regardless of PD-L1 status. The safety profile of NIVO 3 mg/kg Q2W is favorable vs docetaxel and consistent with prior studies. AEs were manageable with established guidelines. NIVO represents a new standard of care in this patient population. Updated OS and safety data will be presented.
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ORAL02.05 - Safety and Efficacy of First-Line Nivolumab (NIVO; Anti-Programmed Death-1 [PD-1]) and Ipilimumab in Non-Small Cell Lung Cancer (NSCLC) (ID 786)
10:45 - 12:15 | Author(s): N. Ready
- Abstract
- Presentation
Background:
Combined blockade of the PD‐1 and cytotoxic T‐lymphocyte‐associated antigen‐4 (CTLA‐4) immune checkpoint pathways has shown improved responses, encouraging survival rates, and a manageable safety profile in advanced melanoma. NIVO, a fully human IgG4 PD-1 immune checkpoint inhibitor antibody, has activity across NSCLC histologies and is approved in the US for treatment of metastatic squamous (SQ) NSCLC with progression on or after platinum-based chemotherapy. This phase 1 study evaluated the safety and efficacy of first‐line therapy with NIVO plus ipilimumab (IPI), an IgG1 CTLA‐4 checkpoint receptor blocking antibody, in chemotherapy‐naïve patients with advanced NSCLC.
Methods:
Patients (N=49) received NIVO plus IPI at the 1+3 mg/kg or 3+1 mg/kg combination dose, respectively (one SQ and one non‐SQ cohort per dose level), every 3 weeks for 4 cycles, followed by NIVO 3 mg/kg every 2 weeks until progression or unacceptable toxicity. Objective response rate (ORR; RECIST v1.1) was evaluated overall and by baseline tumor PD‐1 ligand 1 (PD‐L1) expression (PD‐L1[+]: ≥5% tumor cells expressing PD‐L1). Response was assessed at weeks 10, 17, and 23, and every 3 months thereafter until progression.
Results:
Median follow‐up for all patients was 50 weeks. Across histologies, confirmed ORR was 13% (3/24) for NIVO1+IPI3 and 20% (5/25) for NIVO3+IPI1. Two of 3 and 4/5 responders in the NIVO1+IPI3 and NIVO3+IPI1 arms, respectively, achieved a response by first scan. Median duration of response was not reached (NR) in either group, and responses were ongoing in 67% (2/3) and 60% (3/5) of patients treated with NIVO1+IPI3 and NIVO3+IPI1, respectively. Two patients in the NIVO3+IPI1 group exhibited an unconventional “immune-related” response with 56% and 64% maximum reductions in target lesions and simultaneous appearance of new lesions. The 24-week progression-free survival (PFS) rates and median PFS were 44% and 16.1 weeks, respectively, for NIVO1+IPI3 and 33% and 14.4 weeks, respectively, for NIVO3+IPI1. One-year overall survival (OS) rates and median OS were 65% and NR, respectively, for NIVO1+IPI3 and 44% and 47.9 weeks, respectively, for NIVO3+IPI1. Thirty-eight of 49 treated patients were evaluable for PD-L1 expression; objective responses were observed in PD‐L1[+] (19%, 3/16) and PD‐L1[-] (14%; 3/22) patients. Across arms, grade 3–4 treatment-related adverse events (AEs) were reported in 25 patients (51%); grade 3 pneumonitis was reported in 3 (6%) patients. Treatment‐related AEs led to discontinuation in 18 patients (37%); 15 (31%) patients discontinued treatment during induction. Treatment‐related deaths (n=3) were due to respiratory failure, bronchopulmonary hemorrhage, and toxic epidermal necrosis.
Conclusion:
Treatment with NIVO plus IPI was associated with durable responses and encouraging survival regardless of tumor PD-L1 expression. The safety profile was managed using established safety guidelines. Updated OS and results from additional doses and schedules will be presented.
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ORAL02.07 - Atezolizumab (MPDL3280A) Combined with Platinum-Based Chemotherapy in Non-Small Cell Lung Cancer (NSCLC): A Phase Ib Safety and Efficacy Update (ID 2208)
10:45 - 12:15 | Author(s): N. Ready
- Abstract
- Presentation
Background:
Despite advances in treatment for NSCLC, the standard first-line treatment for metastatic disease remains platinum-based doublet chemotherapy with historical overall response rates (ORRs) of ≈30%. Preclinical data suggest that chemotherapy treatment can result in antigen release in the tumor microenvironment, potentially enhancing effects of cancer immunotherapy. Atezolizumab (MPDL3280A) is a human monoclonal antibody that targets the PD-L1/PD-1 immune checkpoint, while leaving the PD-L2/B7.1 interaction intact (which may reduce the risk of autoimmune lung toxicity). As atezolizumab has shown promising activity in advanced NSCLC, we investigated atezolizumab in combination with chemotherapy.
Methods:
A Phase Ib study was conducted to evaluate atezolizumab with chemotherapy in locally advanced or metastatic NSCLC patients who had not received chemotherapy for advanced disease. Pts received atezolizumab 15 mg/kg IV q3w with standard chemotherapy (carboplatin plus either paclitaxel [Arm C], pemetrexed [Arm D; nonsquamous] or weekly nab-paclitaxel [Arm E]) for 4-6 cycles followed by atezolizumab maintenance until progression. RECIST v1.1 was used to assess ORRs (unconfirmed) in pts dosed by Jun 29, 2014 (data cutoff: Sep 29, 2014). PD-L1 expression was centrally evaluated using the SP142 IHC antibody assay.
Results:
37 NSCLC pts were safety evaluable (8 in Arm C; 14 in Arm D; 15 in Arm E). Across these arms, 54% of pts were male, with a median age of 65 y (range, 40-82 y). 81% had non-squamous NSCLC, and 19% had squamous NSCLC. Median safety follow-up was 22.0 wks (range, 0.1-49.4 wks). Across arms, all-Grade AEs regardless of attribution included those commonly associated with chemotherapy, such as nausea (Arms C & D, 50%; Arm E, 73%), fatigue (Arm C, 38%; Arm D, 36%; Arm E, 73%) and constipation (Arm C, 25%; Arm D, 71%; Arm E, 27%). The most common Grade 3-4 atezolizumab-related AEs included anemia (Arms D & E, 7%), neutropenia (Arm C, 13%; Arm D, 7%) and thrombocytopenia (Arms D & E, 7%), with no pneumonitis or autoimmune renal toxicity observed. One potentially atezolizumab-related Grade 5 AE was observed in Arm D (candidemia after prolonged neutropenia). 30 pts were efficacy evaluable, and responses were observed in all arms regardless of PD-L1 expression (Table). Updated clinical data will be presented.Table. RECIST v1.1 Responses in Patients with NSCLC
Arm C: carboplatin + paclitaxel (n = 5) Arm D: carboplatin + pemetrexed (n = 12) Arm E: carboplatin + nab-paclitaxel (n = 13) All Indicated Arms (n = 30) ORR, % 60% 75% 62% 67% 95% CI, % 19%-92% 45%-93% 33%-83% 48%-82% CR, n 0 0 2 2 PR, n 3 9 6 18
Conclusion:
Atezolizumab plus standard first-line chemotherapy was well tolerated in advanced NSCLC pts, with no unexpected toxicities. Clinical activity was promising and supportive of a potential synergy of atezolizumab with chemotherapy. Based on these results, several Phase III studies have been initiated.
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ORAL 10 - SCLC (ID 98)
- Event: WCLC 2015
- Type: Oral Session
- Track: Small Cell Lung Cancer
- Presentations: 1
- Moderators:C. Faivre-Finn, P. Lara Jr.
- Coordinates: 9/07/2015, 10:45 - 12:15, 605+607
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ORAL10.01 - A DLL3-Targeted ADC, Rovalpituzumab Tesirine, Demonstrates Substantial Activity in a Phase I Study in Relapsed and Refractory SCLC (ID 1598)
10:45 - 12:15 | Author(s): N. Ready
- Abstract
Background:
Rovalpituzumab tesirine (i.e. SC16LD6.5) is a Delta-like protein 3 (DLL3) targeted antibody-drug conjugate (ADC) comprised of a humanized monoclonal antibody, dipeptide linker, and pyrrolobenzodiazepine (PBD) dimer toxin with a drug-to-antibody ratio of 2. DLL3 is highly expressed in human neuroendocrine tumors and their tumor-initiating cells, including approximately two-thirds of small cell lung cancer (SCLC). DLL3 is not expressed at detectable levels in normal tissues. Rovalpituzumab tesirine induced tumor regression and prolonged time to progression significantly outperforming cisplatin/etoposide in DLL3-expressing SCLC patient-derived xenograft tumor models. Based on this promising activity, a first-in-human phase I trial in patients (pts) with recurrent SCLC was initiated and preliminary results are reported below.
Methods:
SCLC pts with progressive disease after 1 or 2 previous lines of therapy received escalating doses of rovalpituzumab tesirine as a single agent once every 3 weeks (Q3W) in 1-3 pt cohorts until dose limiting toxicities (DLTs) were observed. The doses were 0.05, 0.1, 0.2, 0.4 and 0.8 mg/kg Q3W. Midway through accrual, pharmacokinetic data revealed a longer than expected ADC half-life of ~11 days, prompting evaluation of a Q6W schedule. A DLL3 antibody was developed and utilized to assess antigen expression in archived tumor specimens. Biomarker positive (BM+) tumors were defined by IHC membrane-associated H-Scores ≥ 120.
Results:
52 pts were treated: 34 Q3W and 18 Q6W; 24F/28M; median age, 61 years (44-82). Acute and chronic DLTs of thrombocytopenia and capillary leak syndrome (CLS) were observed at 0.8 and 0.4 mg/kg Q3W, respectively. Maximum tolerated doses (MTD) of 0.2 mg/kg Q3Wx3 cycles and 0.3 mg/kg Q6Wx2 cycles were further evaluated in expansion cohorts. The most common treatment emergent adverse events of any grade among all pts were fatigue (40%), rash (39%), nausea (29%), dyspnea (23%), decreased appetite (21%) and vomiting (21%). Grade 3+ CLS and thrombocytopenia were seen in 7 (14%) and 3 (6%) pts, respectively, with no reported Grade 5 toxicity. Of 38 archived tumor specimens received from enrolled pts, 23 (61%) were DLL3 BM+. Among the 16 confirmed DLL3 BM+ pts treated at the MTDs, 7 pts (44%) had partial response (PR) and 8 pts (50%) achieved stable disease (SD) for a combined clinical benefit rate (CBR) of 94%. In all evaluable pts treated at the MTD without regard for DLL3 biomarker status (n=32), the ORR was 22% (n=7 PR) and SD 53% (n=17), for a CBR of 75%. Notably, all pts with PRs that were treated at the MTD, and those having the most durable clinical benefit (up to 569 days OS), were BM+. Similar response rates were observed among pts sensitive and refractory to first-line therapy, and in the third-line setting where no standard-of-care currently exists.
Conclusion:
Rovalpituzumab tesirine, a first-in-class DLL3-targeted ADC, has manageable toxicity and demonstrated significant anti-tumor activity (44% ORR and 95% CBR) as a single agent in second- and third-line pts with recurrent DLL3 BM+ SCLC. A pivotal study is being planned.
