Oncology Unscripted With John Marshall

John Marshall

Oncology Unscripted with John Marshall, MD brings you a unique take on the latest oncology news including business news, gossip, science, and a special in-depth segment relevant to clinical practice.

  1. Oncology Unscripted With John Marshall: Episode 26: Microbes, Mutagens, and Mortality: CRC in a Younger Generation

    Jan 28

    Oncology Unscripted With John Marshall: Episode 26: Microbes, Mutagens, and Mortality: CRC in a Younger Generation

    Oncology Unscripted at ASCO GI: People, Pipelines, and Precision John Marshall, MD: Hello, everybody, from San Francisco, California. My name is Dr. John Marshall, and you are on—maybe unwisely—Oncology Unscripted. But thanks for joining me. I love this meeting, but let's first talk about the news of 2026. Top of the line is: we're out to get new countries. Now, I'm sort of running for mayor of Havana. I don't know if it's important that I, in fact, speak Spanish—because I don't. I speak a little bit of French. My Spanish is terrible. But maybe it won't matter, because I am who I am, and they're looking for just my kind of person to go be mayor of Havana. So, if you see that and you get a chance to vote, vote me in. I love the whole country of Cuba—it's beautiful. Second, in today's newspaper—I couldn't believe it—this guy named Dr. Oz, you know him, he's an actual cardiologist, believe it or not. Then he became the talk show host. And then, for some reason, he's the head of CMS at this point—one of the head overseers of healthcare here in the country. And he said his position was that alcohol is good. This couldn’t have made me happier. This couldn’t have been a better holiday present, because I'm a big alcohol fan myself, and now I can feel less guilty about it. His rationale is that if you drink more, you'll be with people more, you'll be more relaxed, and the camaraderie will pay off in terms of lessening your anxiety and stress—and the world will be a happier place. So, don’t be smart. We don't want people in our country to be intelligent or educated. Drink more. Be less educated. You'll be happier in the long run. That's the official position of our government today. Probably the most important new news from a healthcare perspective is that the House approved an extension on the Affordable Care Act. This has been an incredible threat and uncertainty for so many of our patients. The people who depend on that health insurance could never afford cancer care without it. Having the extension of the Affordable Care Act—for them—talk about lowering your stress. Maybe better than alcohol is actually being insured. I don’t know if you go to many meetings out there, but this one is called GI ASCO. It's always in San Francisco. It's always in this building that I'm standing in now. I have perfect attendance. I’ve been to every one since they started. You should get a special ribbon for that. I think there’s probably one down there for that. They are a little bit more environmentally conscious—no plastic covering to this. Just a piece of paper. Totally recyclable old name badge. Way to go, ASCO, on that. Do you go to meetings or don’t you? I come to this one for a very, very important reason. I come to this one for the people. It’s a small meeting. It’s just the GI gang, both from the industry side and the academic side. It’s a very heavy global presence that comes. I know almost everybody here, and there are only like 3,000 people here. There’s time to stop and say hello to almost everybody you know—give them a hug, share a little COVID, maybe flu, with each other—but then know that you are connected again. And this is something Zoom doesn’t do. This is something you can’t check on—somebody’s kids—over a meeting. But that’s one of the main reasons I come. I love these people. These are people that share in our values and our motivation to try and cure cancer. We all take care of the group of cancers—GI cancers—which are the most common, most fatal cancers on our planet. We are inspired to do this. We know it’s a steep climb, and we do it together. I’m so very pleased to be a part of this community, and it’s the main reason I come. Main reason—people. Second reason—pipelines. There’s a lot of data out there, and there are a lot of companies here that finally have new products for GI cancers. We’ll talk a little bit about that in more specific detail, but if you just look at the number of groups that are here—the number of people who’ve got innovative, new approaches—whether it’s novel immunotherapy, targeted agents, combinations of those, targeted antibodies that are delivering toxic payloads—we’re seeing waterfall plots that we haven’t seen in decades. So, response rates, survivals, progression-free survivals that really compare favorably to our traditional chemotherapy approaches. We are on the cusp of a true revolution in the world of GI cancer. And, surprisingly, one more—led by the world of pancreatic cancer. So, let’s talk a little bit about precision in GI oncology. The biggest breakthroughs that we are seeing at this meeting have to do with RAS targeting. There are a bunch of RAS drugs out there now. There are some that are more out in front than others. There are some that are degraders that break down the RAS. There are some that block pan-RAS, so they hit a bunch of RAS targets. There are some that are very specific for one particular kind of RAS mutation—and they’re working. Now, they’re not curing everybody. But we’re seeing great waterfall plots, even with single agents, in a disease that we haven’t cracked in a long, long time—and that is pancreatic cancer. So, we are all incredibly optimistic about what we are seeing. We are anticipating approvals this year for some—maybe one or more—of these agents. We’re excited about the possibility of combining these RAS-targeted agents with things like immunotherapy or others. We are already starting to try and think about: is the pan-RAS better than an isolated targeted RAS? What are the toxicities? How are we going to manage it? Because we’re fully expecting these drugs to get approval and to get rapidly incorporated into our day-to-day management. First, pancreas cancer. We’re seeing it in biliary cancers. We’re seeing it in stomach cancers. Where we’re not seeing it just yet is in colorectal cancer. And I would’ve predicted a long time ago that colon was going to be the easiest nut to crack. And yet, we’ve made progress. But in fact, what we’re going to see now—biliary, hepatocellular, pancreas cancer, stomach cancers—we’re going to see a lot of evolution over the next several years. A good friend, and really a fabulous speaker, Dr. Andrew Ko from here in San Francisco—UCSF—was the discussant just an hour ago in this building, where he did a great job of setting the stage of both the excitement for the future, but also a healthy respect for what we are going to need to understand to march forward quickly but effectively for all of those patients we’re sitting across the exam room from—that need our help. So, precision medicine is finally making its way to GI cancers—led by the RAS wave that we are seeing. So, stay tuned. You’re going to have new drugs out there. There’s going to be competition. A lot of people talking about it. As we talked a lot about pipelines and the new drugs that were coming out, one of the common questions we get is: what's missing? What have we not been studying well enough? And I have a pretty consistent answer—and that is the microbiome. We don’t understand the impact of those bacteria on us, on our health, on the effectiveness of drugs, etc. And until we really start digging into that science, I don’t think we’ll see that next wave of innovation. So, the answer is microbiome. So, why do I come to GI ASCO every year? Well, you already know the number one reason—that’s people. I love them. They’re my family, and I love to catch up with them just like you do with your family around the holidays. This is my family visit for the holidays. Second—pipelines. Understanding what’s out there today, what’s coming, and how we are going to cure patients with GI cancer. It’s going to be through these pipelines. And then last—the latest data. And that’s around precision medicine. We are about to embark on a wave of therapies that target RAS, and you’re going to start to see cancer shrink as these new drugs come into play. Our job, then, over the next couple of years, is to take this new understanding, this new ability to control precision medicine, and apply it to our patients—to cure more patients with GI cancers. Thanks for joining me from San Francisco. Totally unscripted. John Marshall, Oncology Unscripted. Microbes, Mutagens, and Mortality: CRC in a Younger Generation John Marshall, MD: John Marshall Oncology Unscripted. A lot of good data coming out on all sorts of things. You know, I'm a colon cancer guy, so I really want to talk about two clinical trials in the colon cancer space. One was a paper in Nature—it's actually a few months old—but, you know, I keep seeing all these young people with colon cancer, and I keep thinking: it's the microbiome. It's gotta be. And this paper actually found a version of E. coli that produces a toxin that, if you're exposed to it at a young age—say 10, 11, 12 years old—it dramatically increases your risk of getting colon cancer later. Now, I sort of didn’t think of it as one bacterium causing one toxin causing a toxicity. I always thought it was more of a gamish—what swamp do you have? What's the nature of your rainforest, your bacteria in the colon, that's causing it? But what I'm excited about is that we're continuing to see, week after week, month after month, new data that supports a better understanding of the microbiome—one that we hope will translate into not just identifying people who are at risk for early-onset colon cancer, but, as you know, other diseases as well. And as a related story—this comes out of Cancer Investigation—patients who are taking GLP-1 drugs had lower colon cancer death rates. So basically, they looked at colon cancer patients, and the strongest signal was in those who were obese. But if you were on a GLP-1 versus not on a GLP-1, your survival was much better on one. So, again,

    34 min
  2. Oncology Unscripted With John Marshall: Episode 25: New Hope in GI Cancer Care

    12/18/2025

    Oncology Unscripted With John Marshall: Episode 25: New Hope in GI Cancer Care

    MedBuzz Tariffs, Taxes, and Trade-Offs: Can Raising Taxes in the UK Get You Cheaper Drugs in the US? John Marshall, MD: John Marshall for Oncology Unscripted. There's been all sorts of stuff going on out there in healthcare—in the business of healthcare—and a recent article that was just published in The New York Times told us something about the relationship between the National Health Service, how patients get access to drugs there in Great Britain, and our relationship with them and the tariffs. You're like, how could the tariffs have anything to do with the National Health Service? Well, let me give you a very short little background, if you don't know already, on the National Health Service—Britain’s public health system. The Brits love it. It's tax-based. It's not fancy, it's not frilly. But if we're going to bring in some new medicine or some new expensive therapy—whatever it is—the budget has to be balanced.So, either they have to remove something from what the patients have access to, or they have to raise taxes. And there is a committee known as the NICE committee, the National Institute of Clinical Excellence—staffed by physicians that, in fact, governs that.  You're thinking, where is Marshall going with this?Well, where he is going—and The New York Times presented this—is that because of the tariffs, right? Britain makes some drugs, and we import them here and use them. Well, if the tariffs are in place, those drugs will be more expensive to import. And the whole idea behind the tariffs is to make it so that more Americans are doing the manufacturing. Well, the Trump administration and the National Health Service just made a new deal where the Brits will get access to more drugs—so they'll raise their expenses, if you will. And it's going to hit the bottom line over there...because they're going to have access to medicines that they don’t currently have access to. In exchange, the U.S. is going to say, “Well, we'll waive those tariffs on drugs you import.” So, it is access over here for an economic change—an international economic change—around the tariffs. I have no idea how this is going to work out. I didn’t really understand all the math—were taxes going to go up in Great Britain? Were they going to call it a wash because the tariffs were not going to be in place? I don’t know. The good thing for patients in the UK is that they're going to have more access to more medicines. What I worry about is that it'll come on the backs of either going into debt—if the National Health Service goes into more debt, sort of like our healthcare system—or, in fact, they raise taxes, or somehow they magically make the budgets balance. So, we need to look ahead to 2026 and see just what happens with this UK National Health Service–Trump tariff deal that was just reported in The New York Times. Stay tuned here for more updates on Oncology Unscripted. [03:04] Editorial/Main Topic What I Tell Every New Patient With Cancer John Marshall, MD: John Marshall for Oncology Unscripted.I start almost every new patient appointment by talking with the patient and saying that I—I don't really know why people get cancer. We memorize lists of what we're supposed to do and what we're not supposed to do, but, bluntly, almost everybody sitting across the room from me didn't do anything on the bad list, and yet here they are, sitting there with cancer. It seems to me—and I think this is popular science thinking as well—that we probably all get cancer all the time. But our bodies actually have outstanding spell checkers and an outstanding functional immune system that can see early cancers and fix them before they cause any trouble. So, what that actually means, then, is that those cancers that make it—those cancers that survive through the spell checker or through the immune system—must have figured out a way to get around the spell checker, or have broken the spell checker, or maybe are hiding from the immune system. And so, almost all of our new research going on right now in cancer medicine is either trying to fix the spell checker—and by this, I mean targeted therapies, signaling pathways, et cetera—or it's trying to turn back on, wake back up, or uncover the tumor from the immune system so the immune system can go in and do its job. And so, I think what you see at almost any conference nowadays focuses on those two approaches. It's not some new chemotherapy, although chemo continues to be very important and has cured a whole lot of people, so don't get me wrong about that. But what we're seeing in terms of innovation has a lot to do with improving the immune system, measuring the immune system, having better immunotherapy or immunotherapy combinations, and, at the same time, uncovering the molecular abnormalities of our cancers and having targets to those—and, in some cases, combining those with novel therapies as well. So, be on the lookout for the next innovation: either fixing your spell checker or fixing your immune system. But, in support of that, let's look at some of the coolest, latest data that's practice changing in our world today.  John Marshall for Oncology Unscripted. [05:42] Interview New Hope in GI Cancer Care: A Candid Conversation with Dr Yelena Janjigian John Marshall, MD: Hey, everybody out there in videoland or maybe you’re in podcast land walking your neighborhood. Maybe you have a pit mix dog you're walking because she hasn’t been out in a while, but wherever you are, this is for Oncology Unscripted, and I am a lucky guy because I am joined today by not only a great friend, but also someone who is really setting the standard of care for us in so many ways in GI cancers, and that's Dr. Yelena Janjigian. Yelena, how is New York City today? How is it up there? Yelena Jangigian, MD: Thanks for having me, Donna. It's great. New York is the best place to be. It's beautiful and sunny, getting ready for holiday season. It's always good to catch up with you and talk research and talk gastric cancer and esophagus cancer outcomes. John Marshall, MD: Do the stores already have, like, decorations ready to go up there? Yelena Jangigian, MD: I have not been out, but I've noticed some things here and there in offices. John Marshall, MD: What do you mean you haven't been out? You live in the hospital, in the clinic, don't you go out? Yelena Jangigian, MD: Not out in shops, but I've noticed a few, like, you know, holidays, actually. Some of them are actually skipping Thanksgiving and going into holiday season decorations in random offices. So, but, you know, the spirit is, you know, cheerful in New York. John Marshall, MD: It is a good time of year. I know you very well, and I know lots of our listeners know you very well. Give us a quick little bio on what you're doing right now. Yelena Jangigian, MD: I'm a physician-scientist working at Memorial Sloan Kettering Cancer Center, focused on advancing care and helping patients with esophagus and stomach cancer live longer using both targeted and immunotherapies. Our lab is focused on trying to understand how we can overcome resistance to some of these medications using both tissue culture and other models. And, of course, I also lead a big group at Memorial Sloan Kettering Cancer Center. We have 45 oncologists all focused on one mission: to improve cancer care for worldwide options for gastric cancer, but also anywhere from esophagus down to the anal canal. So, it's a big group of very dedicated individuals.  John Marshall, MD: So now I know why you haven't been outside. Because you haven't slept, you haven't left. Yelena Jangigian, MD: Annual review time. A lot of paperwork.  John Marshall, MD: Well, let's get into the weeds a little bit on how you are, in fact, helping to lead the improvement in outcomes for patients. But before we jump in, as an old guy in this space, I do have frustration that we in the GI cancer world haven't made more progress compared to our friends in some other cancers. And I know in upper GI and stomach and adenos, etc., precision medicine hasn't been consistent. Things that work in the metastatic setting haven't necessarily worked in the adjuvant setting. It's taken us a long time to get precision medicine targets that are viable for therapies, etc. What are your thoughts about that and why that might be so? Yelena Jangigian, MD: So, yeah, I think it's important to start from basic knowledge that these diseases can be quite heterogeneous. And even in biomarkers such as HER2, cut-and-paste approaches from, for example, breast cancer into gastroesophageal cancer have not been the best way to do it. In fact, understanding the co-occurring alterations in our disease—the RAS pathway activation, the PD-L1 co-occurring with HER2—is what made the major milestone in the breakthrough in first-line setting beyond trastuzumab. So, I think understanding that this disease, in its nature, because of the nature of the GI epithelium, is more complex but also more heterogeneous than some of our other solid tumors is really critical. And also, because it's a rare disease in some countries, uniform and reflexive testing of biomarkers, where you get enough of a critical mass of data into the clinic so that you understand how each individual subset of a subset—for example, within HER2 tumors, p53-mutant tumors may do differently than p53 wild-type, RAS amplified vs RAS neutral—things like that. Until we do things in larger scale really going forward for all patients, we won't understand this nuance because in colon, breast, lung—the big three—there's more data, breadth and depth, these discoveries can be made. John Marshall, MD: I was thinking about the idea of mostly colon cancer, and we've been seeing with IO therapy, where we're going to go in a minute, that even in MSS colon cancers, if it's primary disease, we are seeing responses when we would never see them in metastat

    22 min
  3. Oncology Unscripted With John Marshall: Episode 24: How Do We Translate MRD Innovation Into Everyday Oncology Practice?

    12/15/2025

    Oncology Unscripted With John Marshall: Episode 24: How Do We Translate MRD Innovation Into Everyday Oncology Practice?

    MedBuzz: From Hormones to Heroines: Couric, Cancer, and the Case for Change John Marshall, MD Hello, everybody. John Marshall for Oncology Unscripted, coming to you from my now almost empty office. I've been in this office for, gosh, 20-plus years. It's the big office. You may or may not know I stepped down as the division chief here at Georgetown. We planned it—I wanted to do it a while ago. They said no. So, I finally got to step down because I wanted to do some other things. I get a lot of time back from meetings I really didn’t want to go to in the first place, so I’m happy about that. And it’s enabled me to get back to the world of clinical cancer research and to try and innovate in our space and do a lot less administrative things. So, I am glad for the clean-out, moving down to a smaller office in a fresh region. Probably one of the last times—maybe the last time—I film from this spot.  But I wanted to take some time to review some high-level things that have changed in a big way just in the last week or two. The one that struck me the most is that there's been a change in black box warnings around hormones for postmenopausal women. I lived this too, where we went from hormones being a good thing—and all postmenopausal women were more or less taking them—to then it was unopposed estrogens were evil. And then the cancer lobby—and the breast cancer lobby—really was responsible for making it so women stopped taking hormones. We made it so terrifying that hormones were going to cause breast cancer that, you know, certainly oncologists weren’t prescribing it. GYNs stopped doing it. Primary care docs stopped doing it because no one was really willing to take the risk. And I think about the suffering, quite honestly, that postmenopausal women have endured since this time. It is really, really remarkable. And only now—only now—that people have gone back to actually look at the clinical trials and look at the studies, they actually pretty clearly show that hormone replacement is not bad for these people. In fact, if you look at the colon cancer literature, surprisingly, there was evidence that it decreased the risk of getting colon cancer. And even despite that, they didn’t want to change it around. So, I am excited about that black box warning change. If you’re a postmenopausal woman or you know some that are around you, make sure that if they’re interested, there are new options for those patients. But there’s a second warning that has been installed, and this is around 5-FU and DPD testing—dihydropyrimidine dehydrogenase testing—for 5-FU clearance. Why I think it's a big deal is not only is it an updated Black Box, but NCCN has embraced it. I think it’s a big enough deal that I hope you will click in and watch my interview with Howard McLeod, who is really the world’s expert in this space, about what we should be doing, how to do it, and some of the practical aspects of that. So, make sure and click on that interview and watch it. It’ll be worth your time. All you clinicians out there should do it. Now, whether or not it will become routine, whether or not it will become standard of care, whether or not you’ll get sued if you don’t do it—those things will evolve. But I do think it will be part of your everyday life. So, good to keep up to speed on that. And then lastly, sort of an emotional note to make—and that is, this is the actual 25th anniversary of something I bet you remember. That’s when Katie Couric had a colonoscopy on television, and it was on a morning TV program, The Today Show. She did that because, of course, her husband had had colon cancer, and she became quite a strong advocate. Her sister Emily later developed pancreas cancer and died of that, and she’s been very involved in Stand Up to Cancer and so many things. But I think back about that moment when Katie Couric said, “You’ve got to be getting your colonoscopy.” And the reason it comes up is that, one, we’re giving her a 25th anniversary award here at Georgetown—one of our Luminary Awards. So, we’re very excited about that. I’m going to get to see her later this week and thank her in person. But I was also thinking about the impact that I believe she has had on the number of people who get colon cancer. If you really do the math, the interventions that have changed with colonoscopy, etc., in the United States have probably reduced the number of people who get colon cancer every year by about 20,000. Now, 150,000 people get colon cancer every year. It would be much higher than that if we didn’t have effective screening. So, screening works—fewer people in our clinics—and we need to applaud her for all that she has done. So, that’s all the gossip that’s fit to print for this session of Oncology Unscripted. I hope it gives you a little something to think about, look up, or consider as you move forward in your day tomorrow. John Marshall. See you later. Editorial: How Do We Translate MRD Innovation Into Everyday Oncology Practice? John Marshall, MD John Marshall, Oncology Unscripted. I've talked about this a bunch on our program, and this is the impact of blood-based genetic testing on cancer care—maybe other health care problems as well. And the couple of ways we do blood-based testing: one is to look for mutations from a patient with a known cancer. But we're also using blood testing to see whether or not there is still cancer around—so-called minimal residual disease. And they're similar in technology but different in terms of how we're using them. A lot of us out there are not using the MRD testing, whether it's tissue-based or not, because the truth is we don't really know what to do with that result. If it's negative, do I not give adjuvant chemotherapy? If it's positive, do I give more adjuvant chemotherapy? What if it flips? What if it doesn't? Et cetera. So there's a lot of unknowns, but there is this wave of data that continues to come out. San Antonio Breast coming up has new data around this. We've seen it at ASCO. We've seen newer publications more recently that suggest dramatic differences if your test is positive after surgery versus if it is negative, with hazard ratios that exceed 20. This is prediction of cancer still being around. And yes, the negatives are not perfect, but they, too, are pretty good. So, we talk about finding the right patient to give treatment to in the adjuvant setting.I am certain that some sort of MRD testing is going to be part of this. And I was lucky enough to hear a fabulous lecture by a very, very good friend of mine, Dr Scott Kopetz from MD Anderson, who summarized the current data set around this and says that this is not going to go away. This is the inevitable. The question is: how are we, as health care providers, going to use this data to guide our patients, to guide our therapies, to improve efficiency around all kinds of therapy—most importantly, right now, adjuvant therapy? So, review these data. Look at those hazard ratios. Decide whether or not you want to begin incorporating MRD testing into your general day-to-day care. And let's see what 2020 says with regards to treatment opportunities, clinical trials, et cetera, moving forward. John Marshall for Oncology Unscripted. Interview: Can Pharmacogenomic Testing Make Oncology Safer? A Candid Conversation with Dr Howard McLeod John Marshall, MD: Hey, everybody out there, John Marshall for Oncology Unscripted. You might notice that my studio is a little bit more bare today. One of the reasons is that I’m moving. They’re kicking me out of this office for a smaller office. That’s what you get when you get old. It’s discrimination—age discrimination. It’s actually job-appropriate job discrimination. But we’ve got some blank walls in here, and we’ve got a lot of bright content, and I am so excited to introduce to you all—if you don’t already know him, pretty famous guy in his own right—Dr. Howard McLeod. Howard and I have known each other for decades. We can say that, I think, with some certainty. And I want him to introduce himself, because what we’ve got to talk about is critical to almost everybody’s practice who’s listening in. Howard, welcome. Give us a little background on who you are and what your area is. Howard McLeod, PharmD: Thank you, John. It’s great to be on your program. I’m an avid listener, first-time appearer, as they say. I got dragged into this area of pharmacogenomics the hard way. A little girl nearly died of her therapy instead of her leukemia when I was a fellow at St Jude’s. We ended up finding the gene responsible for that. Then a similar situation when I was over in Glasgow—a man got one dose of 5-fluorouracil and nearly died. So genetics as a way of predicting toxicity has been the theme of my life going forward—lots of implementation work, lots of large clinical trials and such. Fast forward to our work at Utah Tech University: a lot of what we’re doing now is asking, “What do we do with this? How do we make it work in the real world?” Making it work at Georgetown is one thing. Making it work at a small practice “in the wild” is a totally different thing. So, how do we implement this in all places, as opposed to just a few big centers? And the dihydropyrimidine dehydrogenase story that we’re going to talk about today is just one example. There’s a lot of activity around supportive care—Which pain med? Which antiemetic? Which antidepressant?—but this specific example is very much a toxicity example, and I’m looking forward to discussing it with you. John Marshall, MD: Let’s drill into this. One of our themes for this season right now is the increased utilization of molecular profiling—identifying positive signals for therapies. I’ve always thought that pharmacogenomics—because I work with a guy named John Deeken here, who is a you, John—yeah, and he’s been p

    24 min

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Oncology Unscripted with John Marshall, MD brings you a unique take on the latest oncology news including business news, gossip, science, and a special in-depth segment relevant to clinical practice.