Nov 5, 2023
Durvalumab Plus Carboplatin/Paclitaxel Followed by Maintenance Durvalumab With or Without Olaparib as First-Line Treatment for Advanced Endometrial Cancer: The Phase III DUO-E Trial
In this "Podcast Takeover," Dr. Lidia Schapira guest hosts to discuss with Dr. Shannon Westin her own JCO paper, which reports on the DUO-E Trial. Dr. Ramez Eskander also joins in this lively discussion.
TRANSCRIPT
The guest on this podcast episode has no disclosures to declare.
Dr. Shannon Westin: Hello, everyone, and welcome to another episode of JCO After Hours, the podcast where we get in depth on manuscripts published in the Journal of Clinical Oncology. I am your host, Shannon Westin, Social Media Editor of the JCO and Gynecologic Oncologist by trade. And actually, I'm super excited today because we are going to have a podcast takeover because we are discussing my own work, which was simultaneously presented at the European Society of Medical Oncology 2023 Congress and published in the Journal of Clinical Oncology on October 21st, 2023. And this was the DUO-E trial, “Durvalumab Plus Carboplatin/Paclitaxel Followed by Maintenance Durvalumab With or Without Olaparib as First-Line Treatment for Advanced Endometrial Cancer.” Because we’re discussing this work and we wanted you to have an unbiased podcast discussion, Dr. Lidia Schapira, who is a Professor of Medical Oncology at Stanford University and an Associate Editor of JCO and the Art of Oncology podcast host, is going to take over this podcast and really just pepper me with questions about this exciting work.
Welcome, Dr. Schapira.
Dr. Lidia Schapira: Thank you so much. It's such a pleasure to be with you.
Dr. Shannon Westin: And before I turn over the reins, I also want to introduce one of my colleagues, who’s going to be providing quite a bit of insight on this topic, Dr. Ramez Eskander, who is Professor of Obstetrics, Gynecology, and Reproductive Sciences at the University of California, San Diego. And you will know he’s the principal investigator of the GY-018 study, which established pembrolizumab and chemotherapy as the new standard of care in endometrial cancer. Welcome, Ramez.
Dr. Ramez Eskander: Thank you. Thank you, Dr. Westin. It's a pleasure to be here. And congratulations again to you and your study team for this exceptional work.
Dr. Shannon Westin: Thank you. And congratulations to you.
Dr. Schapira, thank you for being here and please do take it away.
Dr. Lidia Schapira: So let's start by having you tell us a little bit about the standard of care for women with endometrial cancer and advanced endometrial cancer prior to this study. Ramez, I'm going to direct this question to you first.
Dr. Ramez Eskander: For many years, actually since about 2012, carboplatin and paclitaxel, which ironically is a chemotherapy backbone really across all of our gynecologic tumors, emerged as the preferred doublet chemotherapy regimen for the management of advanced-stage metastatic or recurrent endometrial cancer. It evolved through a series of different clinical trials, in fact taking us from whole abdominal radiation, systemic chemotherapy, comparing single agents to doublets and then triplet regimen of TAP to carboplatin and paclitaxel, which ultimately, then, following the presentation of GOG Protocol 209 and its publication, as the chemotherapy backbone, being carboplatin and paclitaxel. And it’s been that way for many, many years.
Dr. Lidia Schapira: And how effective is the regimen?
Dr. Ramez Eskander: The response rates to carboplatin and paclitaxel are actually quite reasonable in the patients who have advanced-stage disease, particularly if they haven't had prior systemic chemotherapy. Response rates in the 50% to 60% range. The issue is that the responses tend to be limited and disease recurrence is an expectation in these patients who have advanced-stage disease. And so that really highlighted the importance of trying to continue to advance therapeutic opportunities in these patients to improve long-term outcomes.
Dr. Lidia Schapira: As we think about improved long-term outcomes, we're thinking about a better treatment and also a kinder treatment, perhaps one that is also less toxic. Can you talk a little bit about the population of women with endometrial cancer? Are these older women? Do they have comorbidities?
Dr. Ramez Eskander: What we’re seeing is, interestingly, there has been an evolution a bit in this space. Historically, we used to think about endometrial cancer as—the phrases we used to use are type I and type II. These type I tumors, we would say, are estrogen-driven malignancies; they tend to be seen in overweight or obese patients. And we would identify them in a theoretically younger patient population. And then we had these type II, or what we termed estrogen-independent malignancies, that we would see in an older patient population. Of course, with obesity came metabolic syndrome and other cardiovascular comorbidities, etc. But really, that narrative has evolved dramatically, and that’s really something that will be highlighted in, I think, our discussion of these studies today, where the nomenclature that we used to historically use has evolved because of our understanding of the molecular characterization of this disease. So we’ve really gone away from that, and now we understand that we’re seeing all of these different heterogeneous endometrial cancer types amongst patients of different ages, different comorbidities, different races and ethnicities. And so it’s created a more complex picture for us. But certainly, there are comorbidities that these patients face, and that’s important as we look to identify treatments strategies that are both effective and tolerable.
Dr. Lidia Schapira: My final question before we jump into this very exciting study is about the Cancer Genome Atlas work. Can you tell us how that’s changed the thinking and the design of the studies?
Dr. Ramez Eskander: It was a seminal publication, really, back in 2012/2013 looking at an assessment of endometrial cancers to try and determine whether or not all of these "endometrial cancers" that we used to enroll on a single study are similar or divergent. And it’s important because the study I referenced that really established the standard of care, GOG Protocol 209, as carboplatin and paclitaxel, there was no real consideration of molecular characterization at all. We enrolled all patients onto this study without thinking about these variables, of course, because it was designed, conducted, and completed before the TCGA data emerged. But what we learned from the TCGA is there appeared to be four distinct molecular subgroups. There were the POLE-mutated patient population. There was the mismatch repair deficient or MSI-high endometrial cancer population. There was the copy number-high or what we say are the p53-mutated. And then the last cohort was called the NSMP (no specific molecular profile). But now, that’s even evolved; some people term it TP53 wild type. That’s a bit of even a heterogeneous cohort amongst itself. So we’re going to take these subsets, independent of POLE and an MSI-high, and we’re going to look at TP53 or copy number-high, and that will probably be divvied out further, and the NSMP, and that will probably be subdivided. But really, it gave us these four components, which has then evolved. Many of you may have heard of the ProMisE algorithm or ProMisE Plus, which looked to take the data from TCGA so that we can start to really look at it in clinical practice. So it’s really revolutionized how we think about these patients, how we think about the disease, and how we design trials.
Dr. Shannon Westin: And I just want to add to that because I think that it's so important, what Ramez said about the way we were developing trials, the way we were designing trials. We knew that these classifiers—we were learning these classifiers are prognostic. Now what we’re really trying to hone in on is how predictive they are. And certainly, one of the major classifiers that we’re going to talking…