Perspectives on the Science

Lacking Overall IMspiration for Triplet Therapy in Melanoma? A Review of the Interim Analysis of IMspire150

2023
Melanoma
This Perspectives on the Science article examines the second interim overall-survival analysis of IMspire150 and the evolving role of BRAF/MEK/PD-L1 triplet therapy in BRAF V600-mutant advanced melanoma.
Authors
Affiliations

David Michael Miller, MD, PhD

Massachusetts General Hospital

Harvard Medical School

Kevin Scott Emerick, MD

Mass Eye and Ear

Harvard Medical School

Vishal Anil Patel, MD

GW School of Medicine & Health Sciences

Sonia Cohen, MD, PhD

Massachusetts General Hospital

Harvard Medical School

Isaac Brownell, MD, PhD

National Institutes of Health

Donald P. Lawrence, MD

Massachusetts General Hospital

Harvard Medical School

Published

February 4, 2023

Doi

10.59449/joco.2023.02.04

Published February 4, 2023 · CCO Journal Club · February 3, 2023 · doi:10.59449/joco.2023.02.04
Authors & affiliations 6 authors · View full author list
Authors
  1. David Michael Miller, MD, PhD1,2 iD
  2. Kevin Scott Emerick, MD3,2 iD
  3. Vishal Anil Patel, MD4 iD
  4. Sonia Cohen, MD, PhD5,2 iD
  5. Isaac Brownell, MD, PhD6 iD
  6. Donald P. Lawrence, MD7,2
Affiliations
  1. 1Massachusetts General Hospital, Medicine and Dermatology, Boston, Massachusetts
  2. 2Harvard Medical School, Boston, Massachusetts
  3. 3Mass Eye and Ear, Head and Neck Surgical Oncology, Boston, Massachusetts
  4. 4GW School of Medicine & Health Sciences, Washington, DC
  5. 5Massachusetts General Hospital, Surgery, Boston, Massachusetts
  6. 6National Institutes of Health, Dermatology Branch and Center for Immune-Oncology, Bethesda, Maryland
  7. 7Massachusetts General Hospital, Medicine, Boston, Massachusetts
Featured Article

Ascierto PA, et al. Overall survival with first-line atezolizumab in combination with vemurafenib and cobimetinib in BRAF V600 mutation-positive advanced melanoma (IMspire150): second interim analysis of a multicentre, randomised, phase 3 study. Lancet Oncology. 2023;24(1):33–44. (Ascierto et al. 2023)

Introduction

On February 3rd, 2023 the multi-institutional Community of Cutaneous Oncology (CCO) Journal Club reviewed the recently published Lancet Oncology article “Overall survival with first-line atezolizumab in combination with vemurafenib and cobimetinib in BRAFV600 mutation-positive advanced melanoma (IMspire150): second interim analysis of a multicentre, randomised, phase 3 study”(Ascierto et al. 2023). Participants included clinicians and investigators from Massachusetts General Hospital, Mass Eye and Ear, Brigham and Women’s Hospital, the National Institutes of Health, George Washington Medical Center, and Pennsylvania Hospital. Importantly, the comments in this article represent the views of the authors of this Perspectives on the Science piece after the Journal Club. It does not represent views of any other members of the CCO or the affiliated institutions. In this article we provide a summary of the discussion regarding this important contribution to the literature.

Background and Treatment Context

The treatment landscape for advanced melanoma has changed rapidly over the last ten years (Figure 1)(Miller et al. 2022). Options for patients with advanced disease include immune-directed therapies, such as anti-PD-1(L1), anti-CTLA-4 and anti-LAG-3 monoclonal antibodies, as well as oncogene-pathway targeted therapies (TT) for patients with actionable mutations, including kinase inhibitors directed at BRAF and MEK (Miller et al. 2014). Although dual BRAF/MEK inhibition (BRAFi/MEKi) is generally associated with higher response rates (Figure 2), immune checkpoint inhibitors (ICI) have become a preferred first-line strategy for most patients with advanced disease due to the potential for durable responses (Figures 2, 3 and 4).

TREATMENT LANDSCAPE · 2011–2022
A decade transformed advanced melanoma treatment
Selected U.S. FDA approvals illustrate the successive introduction of checkpoint blockade, BRAF/MEK-targeted combinations, and the triplet regimen examined in IMspire150.
2011
Ipilimumab; vemurafenib
CTLA-4-directed immunotherapy and BRAF inhibition established distinct approaches to advanced melanoma
CTLA-4 / BRAF
2014
Dabrafenib plus trametinib; pembrolizumab
BRAF/MEK combination therapy and PD-1 inhibition broadened treatment options
BRAF/MEK · PD-1
2015
Nivolumab plus ipilimumab; vemurafenib plus cobimetinib
Dual checkpoint blockade and an additional BRAF/MEK regimen entered the treatment landscape
Dual ICI / BRAF/MEK
2018
Encorafenib plus binimetinib
Another BRAF/MEK combination was approved for BRAF V600-mutant unresectable or metastatic melanoma
BRAF/MEK
2020
Atezolizumab plus vemurafenib and cobimetinib
The IMspire150 triplet therapy received approval for BRAF V600-mutant advanced melanoma
BRAF/MEK/PD-L1
2022
Nivolumab plus relatlimab
Dual PD-1/LAG-3 blockade introduced another immune-based first-line option
PD-1 / LAG-3
Selected U.S. FDA approvals through the February 2023 Journal Club. This timeline is illustrative, not an exhaustive catalog; adjuvant-only indications are excluded.
Figure 1. Selected milestones in the expanding treatment landscape for unresectable or metastatic melanoma. The 2020 triplet approval contextualizes the clinical question addressed by the second interim analysis of IMspire150.

Unfortunately, therapeutic options in the second-line setting have yielded sub-optimal results (Kim et al. 2023), highlighting the need to optimize front-line therapy. Given the potential to improve the response rates associated with ICIs and the durability of oncogene-pathway directed therapy, efforts to combine immunotherapy with targeted therapy have been ongoing for over a decade. Mechanistic rationale for combining BRAFi/MEKi with immune checkpoint inhibitors includes priming of the tumor microenvironment for immunotherapy via upregulation of programmed death 1 ligand (PD-L1), increasing lymphocyte traffic and reduction of anti-inflammatory cytokines(Frederick et al. 2013; Wilmott et al. 2012; Schilling and Paschen 2013; Long et al. 2013; Boni et al. 2010; Kono et al. 2006; Sapkota et al. 2013; Vella et al. 2014; Cooper et al. 2013). Initial investigations combining ICI with TT, however, highlighted the potential risk of enhanced toxicity. One early study of combination ipilimumab and vemurafenib reported the development of hepatotoxicity in a significant portion of patients(Ribas et al. 2013). Subsequent studies demonstrated that BRAFi/MEKi could be safely administered with anti-PD-1(L1) monoclonal antibodies (Sullivan et al. 2019; Ferrucci et al. 2020; Dummer et al. 2022). IMspire150, a double-blind, randomized, placebo-controlled, demonstrated improved median progression-free survival (PFS) of combination vemurafenib/cobimetinib/atezolizumab (vem/cobi/atezo) compared with vemurafenib/cobimetinib (vem/cobi) alone (15.1 vs 10.6 months HR: 0.78 (95% CI 0.63 - 0.97))(Gutzmer et al. 2020). Triplet therapy (BRAFi/MEKi/αPD-L1) was associated with more grade 3 or greater treatment-related adverse events (TRAEs) (Figure 5). However, the risk-to-benefit trade off was deemed acceptable and these results led to the FDA approval of this triplet therapy on July 30, 2020.

Additional investigations have evaluated the safety and efficacy of triplet BRAFi/MEKi/αPD-1(L1) therapy. KEYNOTE-022, a phase 2 trial of dabrafenib/trametinib (dab/tram) plus pembrolizumab vs. dab/tram/placebo, demonstrated improved PFS, OS and duration of response (DOR) with triplet therapy (Ferrucci et al. 2020). Notably DOR was more than double with triplet therapy (25.1 vs. 12.1 months; HR = 0.32) compared with doublet TT. Similarly in COMBI-i, a phase III trial evaluating the anti-PD-1 mAb spartalizumab plus dab/tram, demonstrated improved PFS with triplet therapy compared to BRAFi/MEKi (16.2 vs. 12.0 months; HR=0.82 (95%CI 0.66 to 1.03)), although that endpoint was not statistically significant(Dummer et al. 2022). Taken collectively, triplet therapy with BRAFi/MEKi/αPD-1(L1) likely improves PFS compared to BRAFi/MEKi (Figure 6), but at the expense of enhanced toxicity (Figure 7). The effect on overall survival (OS) has less supporting data. The interim results of IMspire150 report on that important endpoint.

Study Design

IMspire150 is a multi-center, phase III randomized study. 514 patients with advanced BRAF V600-mutant melanoma were randomized into treatment groups consisting of cobimetinib 60 mg once daily with vemurafenib 960 mg twice daily for 21 days followed by vemurafenib 720 mg twice daily(triplet therapy group) or 960 mg twice daily (doublet therapy group) for 7 days. The triplet therapy group then received atezolizumab from cycle 2 and beyond. The doublet therapy group instead received placebo from cycle 2 onwards. As previously published, the primary endpoint was investigator-assessed PFS, with OS as a prespecified interim analysis. OS is the focus of this most recent report. Hazard Ratios (HRs) for PFS and OS survival were estimated using a stratified Cox model.

Study Results

At the data cutoff of September 8th, 2021, 273 patients who entered the study had died. 126 deaths occurred in the triplet therapy group compared with 147 in the control group. Median overall survival was 39.0 months in the treatment group compared with 22.8 months in the control group. The Cox model HR for OS was 0.84 (95% CI 0.66 - 1.06, p = 0.14). Median PFS was 15.1 vs. 10.6, in favor of vem/cobi/atezo group. The most common cause of death was disease progression. No new safety signals were reported.

Interpreting IMspire150

Due to the rapid evolution in treatment for melanoma, clinicians have a variety of front-line options for advanced disease. A survey of the multi-institutional and multi-disciplinary group of CCO members present at the February 3rd Journal Club (Figures 8-10) underscores the diversity of current approaches used by melanoma oncologists.

When presented with a case of oligometastatic BRAF V600E melanoma, dual immune checkpoint inhibition was the most commonly recommended approach, with a third of respondents stating they would choose an αCTLA4/αPD-1 regimen, and another third recommending an αLAG-3/αPD-1 regimen. Only one respondent favored single agent αPD-1(L1), with one other selecting a BRAFi/MEKi-based strategy (Figure 11).

Not surprisingly, the majority of melanoma clinicians (71%, 5/7) selected an αCTLA4/αPD-1 based strategy for a patient with more significant tumor burden, including intracranial disease (Figure 12). CCO members cited the results from CheckMate-204 as rationale for front-line Ipi/Nivo for patients with brain metastases (Tawbi et al. (2018)). None of the attendees would have selected a regimen including both BRAFi/MEKi and immunotherapy six months ago (i.e. before the results of this paper) for either clinical scenario. Indeed, the overall experience with triplet therapy was limited, with only one practitioner having recommended BRAFi/MEKi/αPD-1 outside of a clinical trial previously (Figure 13).

For many years there was little high-quality data guiding clinician’s initial treatment strategy selection for patients with advanced BRAF V600 mutant disease. Due to the potential of durable responses with immunotherapy, ICI was often chosen as the initial approach despite not having randomized, controlled data to support this decision. However, data from the recently published Phase III DREAMseq trial has helped fill this important information gap. Two-year OS rates were superior for BRAF V600 mutant patients treated initially with αCTLA4/αPD-1 compared with front-line BRAFi/MEKi (71.8% vs 51.5%, p = 0.01) (Atkins et al. 2023). Median duration of response (mDOR) was also significantly greater with upfront ICI compared with initial TT (mDOR not reached for the initial Ipi/Nivo group vs. 12.7 months for the initial BRAFi/MEKi group, p <0.001). These data reinforce the importance of sequencing therapy appropriately in patients with advanced disease.

Does triplet therapy answer the first-line question that matters most?

The totality of the evidence from IMspire150, Keynote-022 and COMBI-i suggests that the addition of αPD-1(L1) therapy to a BRAFi/MEKi backbone yields improvement in PFS (and possibly OS) at a cost of added toxicity. The major limitation of these studies is that in the current treatment environment - largely solidified by the DREAMseq trial - the control groups (BRAFi/MEKi) are no longer a preferred initial regimen for the majority of patients with advanced, untreated BRAF V600 melanoma. Thus, despite a signal in all three studies that adding αPD-1(L1) to BRAFi/MEKi improves patient outcomes, the role of triplet therapy in the first-line setting remains uncertain. A more relevant and clarifying comparator of front-line triplet therapy would be either monotherapy αPD-1(L1) or dual ICB, given that ICI is being used in the initial management plan for most patients. The operative question being whether adding targeted therapy to an immunotherapy-based regimen produces improved outcomes compared to a front-line immunotherapy-only strategy. As a consequence of this important caveat, the borderline insignificant interim results of IMspire150 had little effect on the medical decision making of the CCO JC attendees (Figure 14). Given that the study was not answering a question critically important to practitioners in 2023, the impact of the paper would have likely been the same had the hazard ratio for OS excluded the null hypothesis. To further support the lack of clarity on the role of triplet therapy after these interim results, respondents replied with similar treatment approaches to patients with oligo- (Figure 15) and more widespread (Figure 16) disease in the current day, as compared with six months ago (Figures 11-12). Again, none of the practitioners selected triplet therapy for these clinical scenarios after discussing the recent update of IMspire150.

Where, if anywhere, might triplet therapy still fit?

Although the clinical vignette of high-tumor burden disease did not elicit a selection of triplet therapy by any of the melanoma clinicians, the question of whether triplet therapy or even quadruple therapy (i.e. BRAFi/MEKi/αPD-1/αCTLA4) would be used in the case of impending visceral crisis was raised. Indeed, the one clinician with previous real-world experience with triplet therapy utilized concomitant BRAFi/MEKi/αPD-1 therapy in a patient with fulminant disease including widespread liver metastases and diffuse melanosis cutis. Fortunately that patient went on to have a complete response and is alive today. Patients that present with symptomatic brain metastases represent another cohort that may benefit from combination TT/ICI. While combination CTLA4/αPD-1 has shown impressive activity in patients with asymptomatic intracranial metastases, the efficacy of ipi/nivo is significantly attenuated in patients receiving corticosteroids for symptomatic disease(Tawbi et al. 2021). Therefore, there is rationale to treat with a lead-in of targeted therapy to decrease intracranial disease burden in order to expedite steroid tapering prior to the administration of immunotherapy. Thus, the discussion reinforced the importance of having options in the treatment armamentarium which can be applied on a case-by-case basis.

Materials and Methods

This Perspectives on the Science piece was published using Quarto®. The survey was conducted using REDCap® (Harris et al. 2009). The figures depicting the survey data were created using R (version 4.0.0) and the tidyverse suite of packages (Wickham et al. 2019), including ggplot2 (Wickham 2016). The figure depicting FDA approved therapies in melanoma was created using the skincancerRx package (Miller and Shalhout 2022).

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Appendix

Article Details

Article type: Perspectives on the Science
Published: February 4, 2023
Journal Club date: February 3, 2023
Volume/issue: 1(1)
DOI: 10.59449/joco.2023.02.04

Citation

For attribution, please cite this work as:

Miller DM, Emerick KS, Patel VA, Cohen S, Brownell I, Lawrence DP. Lacking Overall IMspiration for Triplet Therapy in Melanoma? A Review of the Interim Analysis of IMspire150. Journal of Cutaneous Oncology. 2023;1(1). https://doi.org/10.59449/joco.2023.02.04 Copied!

BibTeX citation:

@article{Miller2023IMspire150,
  author = {Miller, David Michael and Emerick, Kevin Scott and Patel, Vishal Anil and Cohen, Sonia and Brownell, Isaac and Lawrence, Donald P.},
  title = {Lacking Overall IMspiration for Triplet Therapy in Melanoma? A Review of the Interim Analysis of IMspire150},
  journal = {Journal of Cutaneous Oncology},
  year = {2023},
  volume = {1},
  number = {1},
  doi = {10.59449/joco.2023.02.04},
  issn = {2837-1933},
  publisher = {Society of Cutaneous Oncology},
  langid = {en}
}

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Conflict of Interests

Editorial review needed before republishing this refreshed page. The disclosure text in the legacy 2023 QMD appears to name individuals who are not in the article’s author list. The original text is preserved below for reconciliation against the publication record.

DMM reports grants and personal fees from Regeneron, grants from Kartos Therapeutics, grants from NeoImmuneTech, personal fees from Checkpoint Therapeutics, personal fees from Pfizer, personal fees from Merck Sharpe & Dome, personal fees from EMD Serono, grants from Project DataSphere, personal fees from Sanofi Genzyme, personal fees from Castle Biosciences, personal fees from Avstera, outside the submitted work. EYK and SZS report no competing interests. HLK is an employee of Ankyra Therapeutics and serves on advisory boards for Marengo Therapeutics, Castle Bioscience, Virogin and MidaTech Pharma. VAP reports consulting honorarium from Regeneron, PhD Biosciences, Jounce Therapeutics, Almirall, and Castle Biosciences, and stock options from Avstera and Lazarus AI.

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