ASCO Daily News Navigating Therapeutic Advances in EGFR-Mutated NSCLC
Dr. Monty Pal and Dr. Vamsi Velcheti discuss the evolving treatment landscape in EGFR-mutated non-small cell lung cancer, including landmark trials like FLAURA2, novel drug therapies, and the growing importance of ctDNA and MRD testing.
TRANSCRIPT
Dr. Monty Pal: Hello, and welcome to the ASCO Daily News Podcast. I'm your host, Dr. Monty Pal. I'm a medical oncologist and professor and vice chair of academic affairs at the City of Hope Comprehensive Cancer Center in Los Angeles. Today, I'm truly delighted to introduce Dr. Vamsi Velcheti, who's a professor of medicine and the chief of hematology-oncology at the Mayo Clinic in Jacksonville, Florida. We'll be discussing the expanding treatment landscape in EGFR-positive lung cancer and how to navigate the challenges of balancing treatment efficacy, toxicity, and patient quality of life in the EGFR-positive space.
Just FYI, our full disclosures are available in the transcript of this episode.
Vamsi, it's so great to have you on the podcast. Thank you so much for being here.
Dr. Vamsi Velcheti: Thank you, Monty. It's a pleasure to be here with you. It's a really exciting topic and there are a lot of updates in the EGFR space.
Dr. Monty Pal: So, I'm going to need your help with this because I'll be honest with you, I see very little lung cancer, if any, in my practice. I'm pretty much exclusively kidney cancer these days. I'm coming on 20 years at City of Hope now, and I still remember when trials like ECOG 1599 were presented with, you know, platinum doublets. And, of course, the field has changed a lot since then.
But tell us a little bit about the first-line landscape, and I think just for the sake of time, we're going to stick with EGFR-positive disease here. What does it look like these days?
Dr. Vamsi Velcheti: Monty, the foundation of care remains the third-generation EGFR inhibitors. These are selective EGFR inhibitors, like osimertinib. We've had an evolution of the development of these TKIs. Like, you know, we had the first-generation, second-generation, not-so-selective EGFR inhibitors. Now we have mutant-selective EGFR inhibitors in the clinic, and they're doing a really good job. And these are quite effective in patients who have classical activating mutations. But the reality is that these have not been transformative. These agents have fundamentally changed the response patterns, excellent CNS penetration, and very good tolerability profile. However, we don't see a lot of durability in terms of the response.
So, what's different today is now there have been several trials in combination with these third-generation EGFR inhibitors that have really laid the foundation of how we kind of think about EGFR-positive disease. At the high level, there are a lot of challenges to selecting the patients for these combination-based modalities. I'm assuming we'll be talking more about these different trials and different approaches. Some of these combination-based strategies have really moved the needle in terms of improving overall survival and really improving long-term outcomes and durability in our patients.
Dr. Monty Pal: And we are going to get into the weeds on this in just a moment. But I did kick off this podcast talking about chemotherapy, ECOG 1599. It does seem as though chemotherapy is still a component of management in advanced non-small cell lung cancer. So, can you tell us about, perhaps first, you mentioned osimertinib, you know, some of these next-generation EGFR inhibitors. Tell us about the role of chemo plus osimertinib.
Dr. Vamsi Velcheti: That's exactly where I was going with the combination-based strategies. You know, we first started off with our earlier trials in the EGFR space evaluating the question of, are targeted therapies, are these highly effective, third-generation, EGFR-selective inhibitors, superior to platinum-doublet chemotherapy? And we've had multiple trials demonstrating that, like the FLAURA trial and in the past with second-generation EGFR inhibitors like erlotinib and gefitinib and afatinib. So, we know that these TKIs actually perform better than platinum-doublet chemotherapy.
Now, we have a large, global, phase 3 trial data from the FLAURA2 trial, which looks at the question, "Hey, you know, osimertinib is better than chemotherapy, platinum-doublet chemotherapy. Can we do even better by combining osimertinib with platinum-doublet chemotherapy?"
So, FLAURA2 answered that question. This is a large, phase 3 trial, and it's a positive trial with improved durability of disease control and improving overall survival with combination with chemotherapy. So, it's a very important and landmark trial, and essentially combining osimertinib with a platinum-based chemotherapy improved responses, deepened responses, and improved overall survival and really changing the disease trajectory. And this strategy is definitely compelling, especially in patients who have certain clinical high-risk features like, you know, patients who have high disease burden or patients who are sometimes having rapid disease progression early on osimertinib, especially with patients who have a lot of visceral disease burden. So, intensifying treatments up front could alter the natural trajectory of the disease.
Dr. Monty Pal: So, you sort of alluded to this in that last part there, but is that kind of how you in clinical practice select? Is it based on, you know, visceral involvement? Is it based on rapidity of disease where you think about adding chemotherapy to osimertinib? Maybe you can give us the corollary. Which patients do you just use osimertinib alone in, for instance?
Dr. Vamsi Velcheti: Definitely, there are some patients who have low disease burden and they have the classical mutations, like an exon 19 deletion. And these patients, especially if they don't have a lot of disease burden, they don't have CNS involvement, there may be a subset of patients who could just do fine on osimertinib of course, with close monitoring of the disease. I guess we'll get into that later, how do we do that with either ctDNA or like closer imaging or both. So, there may be some opportunity to kind of escalate patients' treatments based on certain clinical characteristics or radiographic characteristics or certain biological characteristics informed by ctDNA or other approaches.
Dr. Monty Pal: No, that's interesting. And you're right, we will chat about ctDNA in just a bit. But before we get there, I think one of the big agents that has really sort of come to the fore in advanced non-small cell lung cancer is amivantamab. I've heard a lot about this in the context of even kidney cancer because in certain subsets, I'm interested in MET-directed therapies and so forth, right? So maybe tell us a little bit about the mechanism of amivantamab first, and then maybe tell us about this pivotal MARIPOSA trial where it's combined with lazertinib.
Dr. Vamsi Velcheti: So, the MARIPOSA trial compared lazertinib alone with amivantamab plus lazertinib. And this trial demonstrated overall survival advantage, and there were key differences in terms of tolerability and the safety of amivantamab, which is an EGFR and MET bispecific, and there were certain kind of unique toxicity profiles that make it a little different than the intensification approach with chemotherapy through the FLAURA2 trial.
So, there's a trade-off in terms of the toxicity profile. It's a different agent and a different management protocol in terms of dermatological toxicity management that clinicians need to be comfortable with. And also, there are certain unique issues in terms of amivantamab; there's a higher rate of infusion-related reactions, there's an increased risk for edema and VTEs because of amivantamab. Certainly a different toxicity profile, different management paradigm there in terms of longitudinal care of these patients requiring dermatological care and like, you know, close monitoring and prophylaxis VTEs. But having said that, definitely it's a different strategy, and it kind of changes the biology and the natural history of the cancers, and we do see some durability of responses that we see with the MARIPOSA. So, it's certainly a great alternative, at least for some patients.
Dr. Monty Pal: That was a great overview of MARIPOSA. Now comes the really difficult question, which is, how do you choose between the two? You have these two great options, right, for EGFR-positive patients. You've already highlighted some of the distinctions in terms of toxicity. I think the audience is well aware of the side effects of chemo-doublet, perhaps even the EGFR-based therapies. Amivantamab is quite new. Give us a sense of how you in clinical practice decide between the two potential options here.
Dr. Vamsi Velcheti: Yeah, I think that's the big challenge. I think these are two independent strategies that have evolved through the phase 3, and both of them have demonstrated overall survival benefit. So, the way I think about this is in three dimensions, right? Like, the disease biology, the patient priorities, and feasibility of care delivery.
So, when I talk about the disease biology, you know, the mechanism is very different, and MET is a very dominant driver of disease in EGFR-altered patients and it's a significant mechanism of resistance, acquired resistance to TKIs. So, certainly I think there's a patient population that could benefit from a MET-directed therapy up front. However, we don't have great data to kind of really demonstrate how using amivantamab in the front line is going to change that. And are there like perhaps like some patients who we could identify who would benefit from such a strategy?
Very recently, there have been some approvals in the second-line setting in lung cancer, not in the EGFR space, but like in generally in lung cancer, with the MET ADCs, and those drugs are approved with a companion diagnostic, which requires MET IHC testing. So, what has happened, at least in large academic practices and also I think in the community now, they have been checking for MET IHC expression more routinely in lung cancer. What we have been doing in our institution is we have been doing MET IHC as a reflex for all patients with EGFR, not just EGFR, but all non-small cell lung cancer patients. What that has done is now, like, we have been increasingly testing patients with EGFR for MET. And there's clearly a subset of patients who have de novo MET expression and a high MET expression. And those patients, I've been kind of like preferentially treating them with the MARIPOSA regimen.
But again, I have to caution the audience that we still don't have data that MET IHC is going to help us make those decisions, whether it's better than like a FLAURA2 regimen. But however, in the second-line setting in the CHRYSALIS trial, we know that MET is a very powerful predictor of response to amivantamab. We really need more data there, but that's what I have been doing in my practice. But also, there's a lot of patient preference here. Like, there are some patients who don't want chemotherapy, and they want a non-chemotherapy approach. So, certainly there are some patients who prefer to have amivantamab. And now with the amivantamab, the subcutaneous version, the infusion reactions and the logistics of actual administration of amivantamab are more favorable with the subcutaneous approval. So, those are some of the elements that we need to take into account.
Dr. Monty Pal: Well, I want to hone in on that because this subcutaneous administration route has been a big debate that I've seen on social media. Tell us, how much easier does it actually make the amivantamab experience? Does it cut down on the rash? Is it just infusion reactions? What's been your clinical experience?
Vamsi Velcheti, MD: So, the subcutaneous administration of amivantamab has definitely improved the infusion reaction issue. Very rarely patients have infusion reaction now with the subcutaneous injections. And also, the infusion time is much, much shorter. Like we don't need a lot of infusion time, which is sometimes a challenge in busy infusion clinics. We need to take that into account.
As far as the impact of the subcutaneous formulation on dermatological toxicity, we haven't really seen significant difference in terms of the intensity or rates of dermatological toxicity with subcutaneous. The benefits are really with the infusion reaction, the ease of administration. And interestingly, in the PALOMA trial, it also seems to be, even though this was not the primary endpoint of the study, there seems to be some suggestion that the subcutaneous amivantamab seems to have improved OS compared to the IV amivantamab. We don't really understand why, but that's a finding from the trial that's very intriguing.
Dr. Monty Pal: That is really fascinating. I'm kind of curious to see how that's going to pan out. I'm going to shift gears a little bit here. And, you know, as we sort of close, I wanted to talk a little bit about biomarkers. I mean, this is obviously not a lung cancer-specific issue. It's something we think about across the board. But what I will say is that there are certain commonalities, and in bladder cancer, we think a lot now about ctDNA. But you've been way ahead of the game in lung cancer. Tell us how you guys use ctDNA, maybe both from the standpoint of monitoring for mutational status, but if you can, maybe offer some insights into some of these new MRD tests that are available too.
Dr. Vamsi Velcheti: Yeah, it's rapidly evolving. Certainly, I think in the lung cancer space, you know, this has really kicked off in the lung cancer space with incorporating ctDNA into the workflow. Of course, you know, like baseline evaluation, we still kind of heavily rely on tissue genomic sequencing. But as you know, with targeted therapy, a lot of these patients have disease that evolves over time, and changes in terms of mutational pattern driving acquired resistance is a major issue across different molecular subtypes. And especially so in EGFR, when there are certain actionable opportunities associated with that transformation. So, we need to kind of have like a longitudinal snapshot of how we monitor these patients. So, the ctDNA has come to be like a tool that has now come to the forefront of clinical workflow, and almost all my patients who are having disease progression have ctDNA for kind of evaluating for resistance and informing treatment decisions, especially in EGFR.
But having said that, there are a lot of challenges in terms of using ctDNA as a tool for monitoring. There are a lot of different types of assays and different platforms, and being able to use this as a quantitative tool that would be used along with the CT scans that we routinely use in clinical practice has been a challenge. And I think I would love to hear your perspectives as well, Monty, about how you're thinking about that in bladder and other disease contexts.
But having said that, I think there's a lot of opportunity to incorporate ctDNA and MRD assays into clinical decision-making. Right now, in terms of clinical trials and clinical development, there have been some very interesting trials that are currently ongoing, especially in the EGFR space. We know that patients who clear ctDNA, based on some retrospective data and also like some retrospective-prospective data from trials that have already read out, that patients who clear ctDNA early with target therapy tend to do much better. They have a longer durability of response. There may be a subset of patients who have, even though they're having radiographic response, they have persistent ctDNA after a certain time point of initiation of targeted therapy. Those patients may require escalation of therapy. We don't yet know. I can't recommend that as a standard right now because we don't have clinical evidence to support that. But however, some of the clinical trials, like the ELIOS trial that's being done right now, that's actually completed enrollment, we'll hopefully see the results very soon.
So, there is an emerging thought that instead of intensifying treatment for all patients with EGFR, there may be a population that may be just fine with frontline osimertinib monotherapy and introducing the intensification strategy at the time of emergence of MRD or progression on ctDNA before radiographic progression. So, there are a lot of adaptive molecular response criteria that we are kind of exploring in clinical trials that could inform how the future is going to look like for EGFR and other perhaps targeted therapies as well. So, it's fascinating, and I think there's a lot of opportunity there.
Dr. Monty Pal: You know, you asked for my perspective. I actually think that what you highlighted there is the most interesting opportunity for ctDNA: the ability to de-escalate therapy. In terms of drug development, we've done so much to bring new therapies to patients, and now it's a bit of an embarrassment of riches, but the downside is that I feel like we tend to overtreat a lot of patients in the clinic. So, I definitely view MRD, you know, some of these other ctDNA techniques with methylation and so forth that may not be sort of tumor-dependent or bespoke could be incredibly, incredibly helpful.
You touched on sort of the future, right, in this last section here with biomarkers. But give us a sense now in terms of novel drug therapies in the EGFR space. What are you most excited about moving forward in 2026 and beyond?
Dr. Vamsi Velcheti: Yeah, I think there's a lot going on in this space, and not just this space, but across lung cancer and others as well. Like looking at the next generation of targets for ADCs. And I think a lot of these have to do with…so far in the drug development space, as you know, the improvements in clinical outcomes has been very incremental. So, we really need to make that big leap. And I think the big leap is not going to come from, in my opinion, from the next ADC, but it's going to come from how we tailor treatments and how we monitor disease better and how do we kind of incorporate the next treatment earlier and not wait for the radiographic progression.
So, there's a lot of opportunity there to integrate biomarkers and dynamic biomarkers into clinical trial design and incorporating the recent advances in terms of drug design. You know, we have a lot of assets in the EGFR space, the next-generation EGFR inhibitors that are kind of designed with resistance in mind and rational combination, knowing when to introduce those combinations is also equally important. So, there's a lot going on, really exciting times to be in drug development. The one thing that I really hope will come to the forefront in drug development, not just for lung cancer, but all disease groups, is to kind of really be thoughtful about how we incorporate these really cool molecular monitoring tools and creating a composite score with imaging to be able to like really design the next generation of clinical trials.
Dr. Monty Pal: You're so spot-on with that. I definitely think that we're getting to this point where, you know, we could think about the next BiTE, the next CAR-T, the next ADC. But, you know, maybe it's time for us to start really honing in on appropriate applications of these drugs, honing in on the right dose and what have you, because I definitely see some issues there.
Vamsi, this has just been terrific. I really want to thank you so much for sharing your fantastic insights with us today on the ASCO Daily News Podcast, and I really appreciate all your efforts to move the field of lung cancer forward.
Dr. Vamsi Velcheti: Thanks, Monty. I really enjoyed the conversation.
Dr. Monty Pal: Yeah, this was terrific.
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Disclosures:
Dr. Monty Pal:
Speakers' Bureau: MJH Life Sciences, IntrisiQ, Peerview
Research Funding (Inst.): Exelixis, Merck, Osel, Genentech, Crispr Therapeutics, Adicet Bio, ArsenalBio, Xencor, Miyarsian Pharmaceutical
Travel, Accommodations, Expenses: Crispr Therapeutics, Ipsen, Exelixis
Dr. Vamsi Velcheti:
Honoraria: Galvanize Therapeutics
Consulting or Advisory Role: Bristol-Myers Squibb, Merck, AstraZeneca/MedImmune, GSK, Amgen, Taiho Oncology, Novocure, Regeneron, Takeda, Janssen Oncology, Picture Health
Research Funding (Inst.): Genentech, Trovagene, Eisai, OncoPlex Diagnostics, Alkermes, NantOmics, Genoptix, Altor BioScience, Merck, Bristol-Myers Squibb, Atreca, Heat Biologics, Leap Therapeutics, RSIP Vision, GlaxoSmithKline