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...