- Research article
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Cost-utility analysis of maintenance therapy with gemcitabine or erlotinib vsobservation with predefined second-line treatment after cisplatin–gemcitabine induction chemotherapy for advanced NSCLC: IFCT-GFPC 0502-Eco phase III study
BMC Cancer volume 14, Article number: 953 (2014)
The IFCT-GFPC 0502 phase III study reported prolongation of progression-free survival with gemcitabine or erlotinib maintenance vs. observation after cisplatin–gemcitabine induction chemotherapy for advanced non-small-cell lung cancer (NSCLC). This analysis was undertaken to assess the incremental cost-effectiveness ratio (ICER) of these strategies for the global population and pre-specified subgroups.
A cost-utility analysis evaluated the ICER of gemcitabine or erlotinib maintenance therapy vs. observation, from randomization until the end of follow-up. Direct medical costs (including drugs, hospitalization, follow-up examinations, second-line treatments and palliative care) were prospectively collected per patient during the trial, until death, from the primary health-insurance provider’s perspective. Utility data were extracted from literature. Sensitivity analyses were conducted.
The ICERs for gemcitabine or erlotinib maintenance therapy were respectively 76,625 and 184,733 euros per quality-adjusted life year (QALY). Gemcitabine continuation maintenance therapy had a favourable ICER in patients with PS = 0 (52,213 €/QALY), in responders to induction chemotherapy (64,296 €/QALY), regardless of histology (adenocarcinoma, 62,292 €/QALY, non adenocarcinoma, 83,291 €/QALY). Erlotinib maintenance showed a favourable ICER in patients with PS = 0 (94,908 €/QALY), in patients with adenocarcinoma (97,160 €/QALY) and in patient with objective response to induction (101,186 €/QALY), but it is not cost-effective in patients with PS =1, in patients with non-adenocarcinoma or with stable disease after induction chemotherapy.
Gemcitabine- or erlotinib-maintenance therapy had ICERs that varied as a function of histology, PS and response to first-line chemotherapy.
The National Institutes of Health estimated that $89 billion were spent on cancer care in the US in 2007, and that the total economic burden reached $219.2 billion when indirect costs associated with lost productivity and premature death were taken into account. Recent trends suggest that the growth of cancer spending will accelerate, owing to costly new treatments  and the increasing number of cancer patients. Lung cancer is the second most common malignancy in the US and is the leading cause of cancer-related deaths . Non-small-cell lung cancers (NSCLC) represent 80% of lung cancers and most patients already have advanced or metastatic disease at diagnosis. Chemotherapy with 4 to 6 cycles of a platinum-doublet is considered the standard of care for first-line treatment of eligible patients with advanced NSCLC. Most patients’ cancers progress after first-line therapy and second-line chemotherapy is recommended for those with performance-status (PS) 0 or 1 .
Maintenance therapy refers to therapy administered after the initial chemotherapy regimen and it is continued or maintained until progression. Multiple approaches are used, including continuation of a portion of the first-line therapy or “switching” to a non-cross–resistant chemotherapy . The first studies conducted in this setting used chemotherapy agents [5–8]. Gemcitabine given to advanced NSCLC patients without progression after first-line treatment with a gemcitabine-cisplatin combination significantly improved progression-free survival (PFS), compared to the best palliative care, but the trial did not reach statistical significance for overall survival (OS) . Early docetaxel  for non-progressive patients after a platinum doublet compared to delayed docetaxel achieved a 3-months prolongation of PFS with a not statistically significant increase in OS. In a similarly designed trial on pemetrexed, PFS and OS were significantly improved for the pemetrexed arm, with a survival advantage of 2.8 months . More recently, the results of a phase III study  also showed a PFS benefit of continuing pemetrexed after 4 cycles of cisplatin–pemetrexed for advanced non-squamous NSCLC. Maintenance with targeted therapies also seems to be an attractive option, with bevacizumab [10, 11], cetuximab , erlotinib  and the erlotinib–bevacizumab combination vs. bevacizumab  yielding positive results. Recently, in a phase III trial, Pérol et al.  compared gemcitabine or erlotinib maintenance vs. observation for patients without disease progression after platinum-based first-line chemotherapy, with a predefined second-line therapy (pemetrexed), and found either gemcitabine or erlotinib to have a significantly improved PFS (primary endpoint), with a not significantly positive impact on OS, possibly by a lack of power.
Maintenance therapy for advanced NSCLC not progressing after a first cisplatin doublet became an option  but the cost-effectiveness of this strategy has not been well-established [16–20]. The published studies [16–19] had several limitations: maintenance-period costs collected retrospectively, second-line costs not collected [19, 20] or model-based study with no prospective recording of cost data [18, 19].
The purpose of this study was to conduct an economic analysis of the IFCT-GFPC 0502 trial , in which each patient’s consumed resources were collected prospectively from randomization (after induction treatment) to the end of the predefined pemetrexed second-line chemotherapy. The aim of this cost-utility analysis was to assess the incremental cost-effectiveness ratio (ICER) of either the gemcitabine or erlotinib strategy compared to observation, for all NSCLC patients who received maintenance therapy (not selected population), and in different patient subgroups, according to PS (0 or 1), histology (adenocarcinoma or non-adenocarcinoma) or response to first-line cisplatin-doublet chemotherapy (stable disease or responder).
Patients and treatment
Patients’ data analyzed herein were obtained from the phase III IFCT-GFPC 05-02 trial [ClinicalTrials.gov identifier NCT00300586, 15]. All patients provided written informed consent for participation in the study and consent for tumor sample collection. The study was approved by the Ethics Committee of Lyon, France and was conducted in accordance with the Declaration of Helsinki and Good Clinical Practice guidelines. Briefly, the objective of that study was to investigate gemcitabine or erlotinib maintenance vs. observation for PS 0–1, advanced NSCLC patients, with no evidence of disease progression after 4 cycles of cisplatin–gemcitabine, and who received pemetrexed as the predefined second-line therapy (Figure 1). Of the 834 patients who received induction chemotherapy, 464 (55.6%) were randomized. Median PFS was significantly prolonged with gemcitabine (3.8 months) or erlotinib (2.9 months) compared to observation (1.9 months). The median PFS benefit seemed to be irrespective of histology for gemcitabine or erlotinib. Second-line pemetrexed was administered in 84%, 74% and 75% of the patients in the observation, gemcitabine and erlotinib arms, respectively. Median OS was improved with gemcitabine (12.1 months) or erlotinib (11.4 months), although not significantly, compared to observation (10.8 months).
The primary objective of this economic analysis was to evaluate the ICERs of gemcitabine or erlotinib maintenance therapy vs. observation. Results are expressed as cost per quality-adjusted life years (QALY).
The natural course of NSCLC was divided into management periods: maintenance therapy, second-line pemetrexed, palliative care and death. During the maintenance period, patients were randomized to receive gemcitabine, erlotinib or observation until disease progression. According to their status at this time, patients then received second-line pemetrexed until their second disease progression, followed by palliative care until death. Patients not given second-line therapy directly received best supportive care until death. Each patient’s time spent in each period was calculated with the trial data.
Costs were estimated from the French health payer’s perspective. They were computed from randomization until the patient’s death or censoring date, and were limited to direct medical costs. Each patient’s resource consumptions were prospectively recorded in the case-report form until the end of second-line chemotherapy. That consumption included chemotherapy drugs (gemcitabine, erlotinib and pemetrexed), hospitalization for any reason and follow-up exams. Costs, expressed in euros (€) were based on the national health-insurance provider’s tariffs for diagnosis-related groups and national fees for ambulatory care, provided by the French Ministry of Health and the national health-insurance provider [21, 22]. Table 1 shows unit prices and tariff sources.
Costs incurred during the palliative period were derived from a representative French nationwide sample of 428 patients, using chart review to assess the mean direct monthly cost of the first 18 months of NSCLC patient management . Specifically, the costs included outpatient and inpatient services, care provision at skilled nursing facilities, outpatient and inpatient drugs and other medications, nursing care organization, home health visits and durable medical equipment. Assuming a yearly increment of 3%, one month of palliative care cost was 2,324 euros (2011 value). Transport and indirect costs (like sick leave) were not included in the analysis, because of insufficient data. No discount rate was applied, given the short life expectancy of these patients.
Self-assessed health state (or utility) scores measure the individual’s preferences for specific outcomes, and are used to calculate QALY. Because they were not directly collected during the study, utility values were extracted from a community population-based study on advanced NSCLC in the UK  using the standard gamble interview to assess quality of life. Utility scores differed according to the period and the type of treatment received (intravenous (IV) chemotherapy, oral chemotherapy, none) (Table 1). Each patient’s QALY was then calculated, from randomization to death or censoring date, by multiplying the duration of each period by the corresponding period’s utility score.
Statistical and sensitivity analyses
Median PFS and OS were estimated using the Kaplan–Meier method. The gemcitabine or erlotinib strategies were compared to observation with the log-rank test. All tests were two-sided.
An ICER was calculated as the ratio of the mean cost difference to the mean effect difference between each treatment strategy (gemcitabine or erlotinib) and observation.
The uncertainty and robustness of the model were evaluated in one-way sensitivity analyses, by varying chemotherapy costs and utility values over a range of likely values derived from confidence intervals (CI) or reasonable ranges, while keeping the other parameters constant.
A bootstrap method, consisting of a resampling procedure with replacement based on the generation of 10,000 replications of the ratio using traditional probabilistic sensitivity analysis (PSA), was used to obtain the non-parametric 95% CI for the ICER. Estimations obtained with the 10,000 bootstrap replications are presented in a radar screen format, with the X-axis showing the difference in effectiveness (QALY) and the Y-axis giving the cost difference between two strategies. Dots represent the 10,000 replications. Bootstrapping was used to determine the proportion of dots in each quadrant of the cost-effectiveness plane. The proportion of replications below the €100,000 per QALY threshold was also calculated. SAS software version 9.2 (SAS Inc, Cary, NC) was used for statistical analyses.
Between July 2006 and June 2009, among 834 patients enrolled at 73 centers in France and who received cisplatin–gemcitabine induction chemotherapy, 464 were subsequently randomized to observation (n = 155) or gemcitabine (n = 154) or erlotinib (n = 155) maintenance therapy. Baseline characteristics were well-balanced among treatment arms (Table 2). At the cut-off date for the primary endpoint (30 August 2010), median follow-up for all patients was 25.6 months.
The result of the economic analysis showed that the mean costs per patient of the maintenance period for gemcitabine, erlotinib or observation maintenance strategies were, respectively, €8,487, 10,551 and 702. With total costs respectively estimated at €28,397, 31,928 and 22,734 for the gemcitabine, erlotinib and observation strategies, maintenance therapy represented 30%, 33% and 3% of total management cost of each strategy (Table 3). Compared to observation, the analysis for the entire post-induction period showed that gemcitabine and erlotinib ICERs were, respectively, €76,625 [44,212 to 188,887] and €184,733 [94,559 to 1,186,736] per QALY. Estimations obtained with the 10,000 bootstrap replications showed that 94.9% of the dots were located in the quadrant in which the gemcitabine strategy was more effective and more expensive than observation, with an ICER ≤ €100,000 per QALY for 69.5% of the cases (Figure 2). For erlotinib maintenance, ICER was also more effective and more expensive than observation in 85.4% of the simulations but ≤ €100,000 per QALY for only 12% of cases.
Subgroup analyses (Table 4) showed that ICERs were favorable for the gemcitabine strategy, regardless of the histologic type, with PS = 0 or for patients with an objective response at the onset of maintenance therapy. The ICERs were also favorable for erlotinib in patients with PS = 0, who had an objective response to induction chemotherapy or with adenocarcinoma. Conversely, regardless of the treatment strategy, maintenance was not cost-effective for patients with PS = 1 or stable disease after induction. Additionally, receiving erlotinib was not cost-effective for patients with non-adenocarcInoma. The results of the one-way sensitivity analyses (Table 5) indicate that the main ICER drivers were the costs of maintenance treatments and health-utility values. In contrast, second-line medications and palliative care costs had only a weak impact on ICER.
Discussion and conclusion
This analysis of gemcitabine or erlotinib maintenance therapy vs. observation with a fixed second-line therapy for advanced NSCLC found a respective ICER of €76,625 and €184,733 per QALY but they varied widely depending on histology, PS and response to induction therapy. Gemcitabine for patients with PS = 0, objective response to induction, regardless of the histology, and erlotinib for patients with PS = 0, responses to induction or adenocarcinoma had the more favourable ICER.
Few economic studies on maintenance treatments for advanced NSCLC have been published [16–20]. Differences in methods, currency and economic outcomes, hindered direct comparisons with our results. In particular a majority of these studies reported a cost per life-year gained (LYG), which is not directly comparable to cost per QALY.
From the US primary health-insurance provider perspective, using the JMEN trial’s data , Medicare reimbursement rates and a retrospective claims database, Klein et al.  calculated the ICER of pemetrexed maintenance compared to observation and found, regardless of histologic subtype, an ICER of US$205,597 per life-year gained (LYG). This difference can mostly be explained by the cost of pemetrexed, which is much more expensive than gemcitabine. As in our study, their ICER varied according to histology, with US$122,371 per LYG for patients with non-squamous cell NSCLC. Using the same JMEN trial data  and based on the evidence submitted by the manufacturer, the National Institute for Health and Clinical Excellence (NICE) calculated an ICER of £47,000 per QALY for the non-squamous NSCLC population . According to a model-based study from the Japanese health insurers vantage point , the ICER for pemetrexed maintenance was about US$109,024 per LYG and US$203,022 per QALY for all histologic types, again more favorable for non-squamous types (respectively, US$80,563 per LYG and US$150,115 per QALY).
Any studies have analyzed ICER according to the response to induction chemotherapy. In contrast to our findings, Vergnenègre et al.  conducted a model-based study using SATURN  data and found that the erlotinib cost per LYG versus best palliative care was €39,783, €46,931 and €27,885 in France, Germany, and Italy, respectively. This difference is mostly attributable to the methodology applied (retrospective analysis and modelization of second-line therapy costs). NICE analysis of the same strategy (erlotinib maintenance for patients with advanced NSCLC and stable disease after four cycles of platinum-induction therapy) calculated respective ICER of £44,812 and £68,120 per QALY for squamous and non-squamous NSCLC patients . All these observations are compatible with our results for the total population, but their methodologies do not allow a precise analysis of the benefit of maintenance therapy according to important clinical characteristics, like PS and the response to induction therapy.
The latest guidelines recommend that quality of life be taken into account when considering treatment for NSCLC . Taking account for the NSCLC burden in terms of health-related quality of life, little information is available on patients’ or society’s preferences with respect to disease states. We used data from Nafees et al. , who adapted existing health-state descriptions of metastatic breast cancer to evaluate the utilities of patients receiving second-line treatment for NSCLC. Each health state describes the symptom burden of a disease and its functional impact.
Our study had several strengths: a head-to-head comparative trial, prospective cost collection of data, patient cohort representative of those able to receive maintenance therapy in the routine clinical setting and a pre-specified second-line treatment administered in more than 75% of the patients in each arm. A subgroup analysis was performed as currently, systemic cytotoxic chemotherapy remains the first-line treatment for most patients with stage IV NSCLC, but preferred treatments are now defined by histology and based on the presence of specific molecular abnormalities . It showed that ICERs of gemcitabine versus observation were more favorable in patients with PS = 0 or those who responded to induction compared to patients with PS = 1 or stabilization of disease after induction. For erlotinib arm, the tested strategy appeared to be not cost effective compared to observation for patients PS = 1, squamous histology or patients with stable disease as the better response after induction. However, it also had some limitations. First, costs were identified prospectively only during the active treatment periods, i.e. until the end of the second-line chemotherapy. Management costs after the end of active treatments were only derived from retrospective data of a 2004 national database. Some patients might have received and eventually benefit from a third-line chemotherapy, and we hypothesized that their expenditures for these chemotherapies would be identical in the 3 arms, and would not impact on the final results. Second, our analysis was limited to direct NSCLC-related medical costs: indirect costs, e.g. lost productivity and caregiver salaries, were not included. Third, the expression of utilities reflects the value from society’s perspective rather than that of the patients involved, since no prospective utility data were collected. Another point was that gemcitabine is now generic in most of the countries which likely means its costs were overestimated for gemcitabine strategy.
Finally at the time of the trial, pemetrexed was used for both squamous and non-squamous histology but only in second line setting. Now, pemetrexed is approved also for 1st line advanced NSCLC, but restricted to non-squamous histology. Therefore the trial population may be different than a potential gemcitabine or erlotinib maintenance population would be today.
Despite these limitations, the results of our analyses showed that gemcitabine or erlotinib maintenance therapy had acceptable ICER for certain subgroups, that they varied widely as a function of histology, PS and the response to first-line chemotherapy. These factors must be taken into consideration to better define the indications for NSCLC management.
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The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2407/14/953/prepub
Sources of support
The IFCT-GFPC 0502 study was funded by the French Ministry of Health (Programme Hospitalier de Recherche Clinique 2005, Plateforme d'Aide à la Recherche Clinique Auvergne-Rhône-Alpes) and an unrestricted grant from F. Hoffmann-La Roche Ltd and Eli Lilly. The French Ministry of Health, Hoffmann-La Roche Ltd and Eli Lilly were not involved in the study design or conduct, data management or analysis, manuscript preparation or review, or the decision to submit the manuscript for publication.
This study was previously presented at the 2012 American Society of Clinical Oncology Annual Meeting in Chicago, IL, US.
The results of the IFCT-GFPC 0502Eco study are the property of the GFPC.
I Borget had received honoraria from Roche for giving a course in health economy. M Perol has a consultant or advisory relationship with Roche, Lilly and Boehringer, has received honoraria from Roche, Lilly and Astra-Zeneca and has received funding from Roche and Boehringer. D Perol had received honoraria from Roche. A Lavole has no competing interests to disclose. L Greillier has no competing interests to disclose. P Do has no competing interests to disclose. V Weestel has received honoraria from Roche and Lilly and funding from Roche. J Crequit has no competing interests to disclose. H Lena had received honoraria from Roche and Lilly. I Monnet has no competing interests to disclose. H Le Caer has received honoraria from Roche and Lilly. P Fournel has received honoraria from Roche and Lilly. L Falchero has no competing interests to disclose. M Poudenx has no competing interests to disclose. F Vaylet has no competing interests to disclose. S Chabaud has no competing interests to disclose. A Vergnenègre has a consultingt or advisory relationship with Roche, Lilly and Boeringher, has received honoraria from Roche, Lilly and Astra-Zeneca and has received funding from Boeringher. G Zalcman has a consulting or advisory relationship with Roche and Lilly. C Chouaid has received honoraria from Roche, Lilly and Boehringer, GSK and Amgen.
IB, MP, AV, DP and CC had full control of the study design, data analysis, interpretation and manuscript preparation. All the authors were involved in planning the analysis and drafting the manuscript. The final draft manuscript was approved by all the authors. There was no medical writer involved in the production and preparation of the present article.
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Borget, I., Pérol, M., Pérol, D. et al. Cost-utility analysis of maintenance therapy with gemcitabine or erlotinib vsobservation with predefined second-line treatment after cisplatin–gemcitabine induction chemotherapy for advanced NSCLC: IFCT-GFPC 0502-Eco phase III study. BMC Cancer 14, 953 (2014). https://doi.org/10.1186/1471-2407-14-953
- Maintenance therapy
- Non-small-cell lung cancer