Maintenance Therapy for Advanced NSCLC: When, What, Why & What s Left After Post-Maintenance Relapse?

Transcription

1 Maintenance Therapy for Advanced NSCLC: When, What, Why & What s Left After Post-Maintenance Relapse? Mark A. Socinski, MD Professor of Medicine Multidisciplinary Thoracic Oncology Program Lineberger Comprehensive Cancer Center University of North Carolina This program is made possible with support from an education grant from Eli Lilly Oncology, who had no role in the development of its content. 1

2 Disclosures Research Support Lilly, Genentech, Pfizer, Celgene, Abraxis, Synta, Imclone Speaker s Bureau Lilly, Genentech This activity is supported by a grant from Lilly Drug Names Used in the Presentation Avastin = Bevacizumab Erbitux = Cetuximab Alimta = Pemetrexed Tarceva = Erlotinib Taxotere = Docetaxel Iressa = Gefitinib 2

3 Paradigms Established in Advanced NSCLC Platinum-based chemotherapy improves survival in the 1 st line setting The benefit of platinum-based therapy is achieved early and prolonging therapy beyond 3-4 cycles does not yield clinically relevant benefits The addition of selected targeted agents to platinum-based therapy in the 1 st line setting improves survival (bevacizumab, cetuximab) Selected single agents improve survival when administered after platinum-based therapy Chemotherapy has a palliative effect in symptomatic patients across multiple lines of therapy All chemotherapy agents have toxicity, costs and the inconvenience of adhering to a treatment/assessment schedule We do NOT cure this disease; chronicity with acceptable toxicity is our goal Paradigms Not Established in Advanced NSCLC The value continuation of bevacizumab or cetuximab beyond the end of chemotherapy truly provides The role of biomarkers in making routine treatment decisions in daily clinical practice (EGFR mutations excluded) The optimal surveillance strategy during a treatment break (between lines of therapy) The most appropriate treatment strategy in times of multiple active agents and three lines of FDA-approved therapies (i.e., the timing of 2 nd and 3 rd line therapies) The concept of exposure to multiple lines of therapy (from one and done to 3 strikes before you are retired ) 3

4 NCCN Guidelines for Advanced NSCLC 1 st line Platinum-based doublet + bevacizumab or cetuximab Pemetrexed-based therapy for non-squames Erlotinib for EGFR mutants Maintenance Continuation or Switch 2nd Line Docetaxel, Pemetrexed (non-squames) or Erlotinib 3 rd Line Erlotinib Agents tested in the 2 nd line treatment of advanced NSCLC (Phase III) FDA approved (US) - Docetaxel - Pemetrexed - Erlotinib Phase III tested - Gefitinib - Topotecan (oral) - Vinflunine - Vinorelbine - Ifosfamide Cytotoxic agents Targeted agents (EGFR) 4

5 Considerations Regarding Maintenance Versus 2 nd Line (and beyond) Therapy Agents approved based on survival (BR.21 and TAX 317) and palliative advantage Historically, 2 nd line has been given at the time of disease progression Maintenance* Continuation Biologic agent given initially with CT should be continued until PD or unacceptable toxicity (bevacizumab, cetuximab) Switch Use of a new agent not initially part of the original CT (docetaxel, pemetrexed, erlotinib) in non- PD patients following 4 cycles of therapy *NCCN Guidelines modified by MA Socinski Timing of Second Line Therapy in Advanced NSCLC Chemotherapynaïve stage IIIB/IV NSCLC Platinum-based doublet 4 cycles (Bevacizumab ATLAS) R A N D O M I Z E Immediate 2 nd line therapy Docetaxel (Fidias) Pemetrexed (Ciuleanu) Erlotinib (SATURN) Erlotinib (ATLAS) Delayed 2 nd line therapy Docetaxel (Fidias) MD Choice (JMEN) MD Choice (SATURN) MD Choice(ATLAS) Is this maintenance, sequential, prolonged duration or just earlier use of effective second-line therapy? 5

6 Timing of Second Line Therapy in Advanced NSCLC Chemotherapynaïve stage IIIB/IV NSCLC Platinum-based doublet 4 cycles (Bevacizumab ATLAS) Early PD or DLT patients drop out R A N D O M I Z E Immediate 2 nd line therapy Docetaxel (Fidias) Pemetrexed (Ciuleanu) Erlotinib (SATURN) Erlotinib (ATLAS) Delayed 2 nd line therapy Docetaxel (Fidias) MD Choice (JMEN) MD Choice (SATURN) MD Choice(ATLAS) Is this maintenance, sequential, prolonged duration or just earlier use of effective second-line therapy? Fidias Trial Eligibility & Treatment Plan Patient Eligibility NSCLC Stage IIIb/IV Chemonaïve ECOG PS = 0-2 CNS Mets allowed Primary endpoint: Overall Survival HR: 1.43 GC Phase Gemcitabine, 1000 mg/m 2, Days 1, 8 Carboplatin AUC 5, Day 1 Every 21 days. 4 cycles CR, PR SD R A N D O M I Z E Immediate Docetaxel 75mg/m 2 day 1, every 21 days until progression or maximum of 6 cycles Delayed Docetaxel Best Supportive Care, then start therapy at PD 75mg/m 2 on day 1, every 21 days, until PD or 6 cycles Fidias P et al. J Clin Oncol

7 Patient Disposition Chemonaϊve Stage IIIb/IV NSCLC N = 562 GC Phase N = 552 (388 received 4 cycles) ORR 29% SD, PR, CR N = 307 Immediate N = 153 Randomized Immediate Treated N = 142 Treated Off Study N = 245 Delayed N = 154 Delayed Treated N = 91 Progression-Free Survival Total Randomized Population Proportion Surviving Please note: the PFS curves only showed up Immediate to 24 months Delayed LR since very (n=153) (n=154) few patients left without PD/survival p-value Median 24 PFS months after 6.5 randomization. 2.8 months (4.4, 7.2) (2.6, 3.4) < (95% CI) 12-month PFS, % (95% CI) 20% (13, 26) 9% (5, 14) 0.0 therapy Delayed Immediated Progression Free Survival (months) I: D Patients at Risk 7

8 Overall Survival Total Randomized Population Survival Probability Median OS, mos (95% CI) 12-mo survival (95% CI) Immediate (n=153) 11.9 (10.0, 13.7) 48.5% (39.9, 57.1) Delayed (n=154) 9.1 (8.0, 11.2) 38.3% (30.0, 46.5) LR p-value Overall Survival Time (in Months) Patients at Risk I: D: Survival for Patients Actually Receiving Docetaxel on Immediate & Delayed Arms (Fidias) MST (months) N Immediate Delayed 8

9 JMEN Maintenance Pemetrexed Study Design Belani CP et al. ASCO 2009, abstr #8000 Double-blind, Placebo-controlled, Multicenter, Phase III Trial Stage IIIB/IV NSCLC ECOG PS prior cycles of gem, doc, or tax + cis or carb, with CR, PR, or SD Randomization factors: gender PS stage best tumor response non-platinum drug brain mets 2:1 Randomization Pemetrexed 500 mg/m 2 (d1,q21d) + BSC (N=441)* Primary Endpoint = PFS Secondary = OS, RR, DCR, Tox Placebo (d1, q21d) + BSC (N=222)* *B 12, folate, and dexamethasone given in both arms Progression-Free Survival Progression-free Probability Placebo 2.0 mos HR=0.60 (95% CI: ) P < Pemetrexed 4.0 mos Time (months) 9

10 Overall Survival (Intent-to-treat Population) Survival Probability Placebo 10.6 mos HR=0.79 (95% CI: ) P =0.012 Pemetrexed 13.4 mos Time (months) Overall Survival by Histology Non-squamous (n=481) Squamous (n=182) Survival Probability HR=0.70 (95% CI: ) P =0.002 Placebo 10.3 mos Pemetrexed 15.5 mos Time (months) HR=1.07 (95% CI: ) P =0.678 Placebo 10.8 mos Pemetrexed 9.9 mos Time (months) 10

11 Systemic Post-study Therapy Pemetrexed (N=441) % Placebo (N=222) % Patients with post-study therapy Most common post-study therapies Carboplatin 7 10 Cisplatin 5 6 Docetaxel Erlotinib Gefitinib Gemcitabine 9 14 Paclitaxel 4 6 Pemetrexed 1 19 Vinorelbine Higher rate of follow-up treatment on the placebo arm Balanced selection of therapies between arms and low rate of crossover SATURN Phase III trial of Maintenance Erlotinib in Non- Progressors following 1 st Line Platinum-based Chemotherapy Chemonaïve advanced NSCLC n=1,949 Mandatory tumour sampling Stratification factors: 4 cycles of firstline platinum doublet chemotherapy* EGFR IHC (positive vs negative vs indeterminate) Stage (IIIB vs IV) ECOG PS (0 vs 1) CT regimen (cis/gem vs carbo/doc vs others) Smoking history (current vs former vs never) Region Non-PD n=889 Erlotinib 150mg/day 1:1 Placebo Co-primary endpoints: PD PD PFS in all patients PFS in patients with EGFR IHC+ tumours Secondary endpoints: OS in all patients and those with EGFR IHC+ tumours, OS and PFS in EGFR IHC tumours; biomarker analyses; safety; time to symptom progression; QoL *Cisplatin/paclitaxel; cisplatin/gemcitabine; cisplatin/docetaxel cisplatin/vinorelbine; carboplatin/gemcitabine; carboplatin/docetaxel carboplatin/paclitaxel Cappuzzo F et al. ASCO 2009, abstr #

12 PFS probability 1.0 SATURN PFS*: all patients HR=0.71 ( ) Log-rank p< Erlotinib Placebo PFS at 12 wks (%) PFS at 24 wks (%) Erlotinib (n=437) Placebo (n=447) Time (weeks) *PFS is measured from time of randomisation into the maintenance phase; assessments were every 6 weeks; ITT = intent-to-treat population SATURN OS*: all patients 1.0 OS probability HR=0.81 ( ) Log-rank p= Erlotinib (n=438) Placebo (n=451) Time (months) *OS is measured from time of randomisation into the maintenance phase; ITT = intent-to-treat population 12

13 SATURN Post-study treatment Erlotinib (n=438) Placebo (n=451) % with at least one treatment All classes taxanes (including docetaxel) antimetabolites (including pemetrexed) antineoplastic agents tyrosine-kinase inhibitors platinum compounds 9 12 ATLAS Phase III trial of Maintenance Erlotinib in Non- Progressors following 1 st Line Platinum-based Chemotherapy Combined with Avastin (Bevacizumab) Miller V et al. ASCO 2009, abstr # 8002 Chemo-naïve advanced NSCLC N=1,160 Eligibility 4 cycles of 1st-line chemotherapy* + bevacizumab Stage IIIB**/IV NSCLC ECOG performance status 0-1 Stratification factors Gender Smoking history (never vs former/current) ECOG performance status (0 v >1) Chemotherapy regimen Non-PD n=768 (66%) Bevacizumab (15mg/kg) + erlotinib (150mg) to PD 1:1 Bevacizumab + placebo to PD Primary endpoint Unblind at PD PFS in all randomized pts Secondary endpoints Overall survival Safety Exploratory endpoints Post progression therapy Biomarker analyses (IHC, FISH, EGFR & K-Ras mutation) *Carbo/paclitaxel; cis/vinorelbine; carbo or cis/gemcitabine; carbo or cis/docetaxel. **IIIB with pleural effusion 26 13

14 ATLAS: Progression-Free Survival 1.0 Proportion Without Event Bev + Placebo (n=373) Bev + Erlotinib (n=370) HR=0.722 ( ) Log-rank P= No. of patients at risk: Progression-Free Survival (months) Bev + Placebo Bev + Erlotinib Exposure to multiple lines of therapy on the JMEN, SATURN & ATLAS Trials JMEN SATURN ATLAS Pem Placebo Erlotinib Placebo Erlotinib Placebo % rec ing 1 st line % rec ing 2 nd line % rec ing 3 rd line NR 55 NR 50 NR 14

15 1 st to 2 nd Line Transition On JMEN, SATURN and ATLAS, patients were followed q3 weeks and evaluated radiographically q6 weeks Despite this, 33-45% did not receive 2 nd line therapy Reasons must be explored (one concern with regard to this issue is waiting for clear evidence of PD) What are the characteristics of these patients? Can we identify which patients will progress rapidly off therapy? Will early treatment make a difference? Can we identify which patients can safely have a treatment break & delay the benefit of 2 nd line therapy? Efficacy Outcomes in Trials of Sequential Versus Delayed 2 nd line Therapy # pts (entered/rand after 4 cycles) RR (%) Rx vs control DCR (%) Rx vs control PFS HR (p value) Fidias JMEN SATURN ATLAS 562/307 (55%)?/663 (?) 1949/889 (46%) 1160/768 (66%) 11 vs 11* 3 vs 1 12 vs 5 NR 67 vs 56* 49 vs vs 51 NR NR (<0.0001) 0.60 (< ) 0.71 (<0.0001) 0.72 (0.0012) in Med PFS 3.7 months 2 months 1 week 1 month OS HR (p value) NR (0.085) 0.79 (0.012) 0.81 (o.oo8) in MST 2.6 months 2.8 months 1 month NR NR * Compares patients treated on the immediate vs delayed docetaxel arms 15

16 The Changing Treatment Paradigm in Advanced NSCLC Standard of Care OBSERVE 1 st Line Rx 2 nd Line Rx ~30 40% Never Rx Should we rethink this? The Changing Treatment Paradigm in Advanced NSCLC Standard of Care OBSERVE 1 st Line Rx 2 nd Line Rx ~30 40% Never Rx New Alternative 1 st Line Rx Should we rethink this? 2 nd Line Rx 95% Rx 16

17 The Changing Treatment Paradigm in Advanced NSCLC Standard of Care 1 st Line Rx New Alternative OBSERVE Should we rethink this? 1 st Line Rx 2 nd Line Rx > Fidias Docetaxel Ciuleanu Pemetrexed SATURN Erlotinib ATLAS Erlotinib 2 nd Line Rx ~30 40% Never Rx All approved 2 nd line agents The Changing Treatment Paradigm in Advanced NSCLC Standard of Care OBSERVE 1 st Line Rx 2 nd Line Rx ~30 40% Never Rx Should we rethink this? Rx Break 1 st Line Rx? Surveillance? > Fidias Docetaxel Ciuleanu Pemetrexed SATURN Erlotinib ATLAS Erlotinib 2 nd Line Rx All approved 2 nd line agents 17

18 Survival for Patients Actually Receiving Docetaxel on Immediate & Delayed Arms (Fidias) MST (months) N Immediate Delayed My Conclusions Patients randomized to the maintenance or early treatment arms of these trials were exposed more often to effective chemotherapy Patients randomized to the placebo arms less often rec d 2 nd and presumably 3 rd line therapy A benefit in PFS and OS using agents approved for 2 nd line therapy in Rx-sensitive patients is not surprising (we already know this from BR.21 and TAX317) If 2 nd line therapy is delayed but delivered, survival outcomes may not be compromised (need more data from JMEN, SATURN and ATLAS) 18

19 My Conclusions It seems intuitive that exposure of more patients to multiple lines of effective therapy will improve survival Heightened surveillance allowing 2 nd /3 rd line therapy to be administered early seems reasonable but carries a risk Sequencing to approved 2 nd line agents immediately following 1 st line therapy will increase exposure to multiple lines of therapy This strategy does improve PFS and OS in advanced NSCLC Maintenance Therapy in Advanced NSCLC When? After 4 cycles of chemo in non-progressors Who? Patients you are worried about What? Docetaxel, Pemetrexed (non-squames), Erlotinib Why? Phase III data showing PFS and OS benefit What s Left? Whatever you did not already use 19

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