Why Are Early-Onset GI Cancers on the Rise?

Dr. Sumanta (Monty) Pal and Dr. Kimmie Ng discuss the disturbing rise of early-onset gastrointestinal cancers, the unique challenges faced by younger patients, and key research that is shedding light on potential drivers of early diagnoses in colorectal cancer.

TRANSCRIPT

Dr. Sumanta (Monty) Pal: Hello, everyone. I'm Dr. Monty Pal, and I'm a medical oncologist and professor and vice chair of medical oncology at the City of Hope Comprehensive Cancer Center in Los Angeles. I'm really delighted to welcome you all to the ASCO Daily News Podcast as the show's new host. I'll be bringing you discussions with leaders in the oncology space on a variety of topics. I've been working hard with the ASCO team on picking the ideal topics to bring to you, and I'm really delighted to introduce my first guest, a dear friend, Dr. Kimmie Ng, to discuss this huge problem that we're seeing nowadays of early-onset GI cancers.

Dr. Ng is the associate chief of the Division of Gastrointestinal Oncology at the Dana-Farber Cancer Institute, and she's an associate professor of medicine at Harvard Medical School in Boston. She serves as co-director of the Colon and Rectal Cancer Program. She's also the founding director of the Young-Onset Colorectal Cancer Center at Dana-Farber. I'm sure we'll talk a little bit about that today. 

Just to note, our full disclosures are available in the transcript of this episode. 

Dr Ng, it's so great to have you on the podcast. Thanks so much for joining us.

Dr. Kimmie Ng: Thank you so much for having me. It's great to be here.

Dr. Sumanta (Monty) Pal: I'm going to refer to you as Kimmie, if you don't mind, for the rest of the podcast here. Please, we'll go by first names, if you don't mind. 

Your research has really done so much to help improve our understanding of early-onset GI cancers. You've done a lot of work to increase awareness in this space. I don't think there's a couple of months that passes by when I don't see you on television on Good Morning America or other shows really broadcasting this really critical message.

I think there's a certain sensitivity that we all have to this issue, right? I mean, because receiving a cancer diagnosis at any age is very challenging, but I'm sure that young patients who face a colorectal cancer diagnosis have some very unique challenges. Could you give us a sense of some of those?

Dr. Kimmie Ng: I think the other reason why so many people are interested in this and feel touched by this is that it's not just gastrointestinal cancers that are increasing in young people, but actually a multitude of different cancers have been rising in young individuals. And while it is difficult at any age to receive a cancer diagnosis, we do all know that young people getting a diagnosis like this do face unique challenges.

Studies have shown that over 80% have children under the age of 18 when they are diagnosed with colorectal cancer, for example, under the age of 50. And many experience career and education disruptions. They are in what we call the ‘sandwich generation,’ where they're not only taking care of young families or starting to think about starting a young family, but they're also taking care of elderly parents. So it's just a very busy stage of life, and to then be facing a usually terminal cancer diagnosis, it is extremely challenging.

The other factors that we've seen that seem to be unique or more prevalent in young patients is that there are higher levels of psychosocial distress, depression, and anxiety, and a majority of patients do need medical attention and treatment for those things, whether it's medication treatment or whether it's counseling or support from psychosocial oncologists.

And so the other big issue is fertility. We know that so many of the treatments that these young patients receive do permanently and negatively impact fertility. And for a person who is young, who may still be trying to expand their family or again start a family, it is very important that these young patients do receive counseling about fertility preservation prior to starting treatment.

Dr. Sumanta (Monty) Pal: You know, it's so interesting you bring this up, and I think about a patient who's in their 40s diagnosed with this disease. They're in the same demographic as I am, as you are. You know, I'm 44 years old, and you know, I'm thinking about my 11- and 12-year-old and my aging parents, right? I mean, the dilemmas that you highlighted are precisely what I'm facing in life, and it's so true, right? If I had to take my day-to-day and superimpose on that a colorectal cancer diagnosis, it would just be problematic in so many spheres, so many spheres.

Dr. Kimmie Ng: Absolutely. And because we did think going into this, starting our Young-Onset Colorectal Cancer Center, that these patients will need unique supports, we did conduct a qualitative study and held some focus groups of young-onset colorectal cancer patients as well as their caregivers. And we really identified four primary themes that I think reflect a lot of the experience of patients with cancer, no matter what type of cancer when they're diagnosed young. And the first is the need, feeling overwhelmed by the healthcare system, and the need for patient navigation. As we know, a lot of these patients are previously healthy before they're facing this very serious diagnosis. The second is the need for peer-to-peer support, where they really value connecting with other young patients going through a similar experience. The third, we talked about already, the need for kind of formal psychosocial support in the form of psychosocial oncologists or psychiatrists or social workers. And the last is an interest in research. They are really very invested in getting germline genetic testing as well as somatic genomic profiling to help guide their therapy.

Dr. Sumanta (Monty) Pal: That's really encouraging to hear that they themselves are interested in participating in research. I mean, obviously, that's a great way to move the field forward. I view your area of work here as being such a vexing problem because no matter what way you slice it, young-onset colorectal cancer still remains a relatively small proportion of all diagnoses. So how do you go about studying this phenomenon? I mean, it must be challenging to really sort of investigate underlying causes when ostensibly this is still a small piece of the pie.

Dr. Kimmie Ng: That is such a great question and is one of the challenges me and my research team think about every single day. As you mentioned, one of the major barriers is that although these cancers are rising in young people, the absolute number of patients being diagnosed is still relatively small, and if it's going to take large scale epidemiologic studies to really understand, for example, what the dietary and lifestyle risk factors are, you need a considerable number of patients in order to have enough power to reach definitive conclusions. 

And so this is where it is so important to collaborate. Any single institution is not going to see enough young-onset patients with colorectal cancer to be able to do this work on their own. And so I have really been intent on establishing an international prospective cohort study of patients with young-onset colorectal cancer so that we can increase the numbers of patients we partner with to try to answer these questions, but also so that we can study this on a global scale, because unfortunately this is not something that's just plaguing the United States. It is actually happening in multiple countries around the world. So that is one barrier. 

The second, I would say, is that we think it's early life exposures to whatever environmental factor it is that's causing the rise that is likely contributing the most. And so if you imagine how difficult it would be to start studying individuals from when they're children through adolescence, through adulthood, and then all the way until a cancer diagnosis is obtained, a study like that would take too long, would cost too much, and really wouldn't be feasible. So we need to think of alternative ways to really try and answer this question of what is driving this rise in young-onset colorectal cancer.

Dr. Sumanta (Monty) Pal: Honestly, Kimmie, this seems like almost an unfair question in the context of what you just mentioned, the challenges in terms of ascertaining causality, right? I'll tell you, I cheated a little bit ahead of this podcast. Kimmie and I had dinner together in Los Angeles a couple months ago. She came out to deliver a Presidential Lectureship at City of Hope. We were delighted to have her. And we did have a couple of thoughts exchanged over potential drivers of these early diagnoses, leaning on perhaps one of the things that you and I are both interested in, the microbiome. But amongst all these things, vitamin D, microbiome, etc., and I won't hold you to this, do you have at least a general sense of what might be contributing to this early-onset phenomenon?

Dr. Kimmie Ng: Yeah, as we talked about during my visit there to City of Hope, we do hypothesize that it is a complex interaction between our exposome, which is everything we are exposed to in our environment, which does include diet and lifestyle factors, interacting with host immunity and antitumor immunity, and as well as the microbiome and shaping the composition and diversity of the gut microbiome that are likely interacting to increase susceptibility to colorectal cancer at a younger age.

And I will say one of the biggest discoveries, if you will, about what might be driving young-onset colorectal cancer was published a few months ago in Nature. And that paper identified a specific mutational signature caused by the genotoxin colibactin, which is often produced by an organism called pks+ E. coli, as being much more prevalent in younger patients with colorectal cancer than older patients. And so while it doesn't explain necessarily all of young-onset colorectal cancer and why it's rising, it does give us a clue that the microbiome is likely very important in perhaps why this is rising in young people.

Dr. Sumanta (Monty) Pal: After you mentioned it, I went back and dove deep into that paper. I was fascinated, fascinated by the content there. And this is just a massive exploration across thousands of patients worldwide. So, I mean, if there is a way to get at least some hint of what's driving this phenomenon, I suppose that's it. So thank you for pointing me in the direction of that manuscript.

Now that we've addressed the issue of diagnosis, if we could just, you know, verge on the topic of treatment, right? And this is something that I struggle with. When I have my young patients with kidney cancer, I don't know necessarily that my treatment paradigm changes a whole heck of a lot. I guess what I will say is I might be a little bit more aggressive about concepts like definitive management with surgery. I suppose perhaps their treatment tolerance is a little bit higher. But tell us about the setting of young-onset colorectal cancer. Is the philosophy any different in terms of the actual sort of management of these patients?

Dr. Kimmie Ng: That's a great question, and actually I was honored to participate in the first international consensus guidelines group to try to come up with uniform recommendations for how to treat young patients with colorectal cancer. And you know, the overall consensus is just as you said, the medical care of these young patients right now is really not that much different than that of an older patient with colorectal cancer.

There are a couple of distinctions. One is that all young patients should get germline genetic testing, given that there is a higher prevalence of pathogenic germline variants when you are diagnosed at a young age. And the second is what we've already talked about, which is that all young patients should be referred for counseling about fertility preservation prior to starting treatment.

But otherwise, the chemotherapy regimens recommended, you know, surgery, radiation, all of that seems very similar to older patients. I will say that because most of our young patients with colorectal cancer are diagnosed with left-sided cancers, including rectal cancers, where some of the treatment may be morbid and result in lifelong complications, we do consider de-escalation of therapy and try to consider the long-term implications when it's safe to do so and won't compromise outcomes.

The other concerning thing is that younger patients don't necessarily have a better prognosis than older patients. And multiple studies have shown this, that even though we both often treat younger patients more aggressively – they more often receive multi-agent chemotherapy, and more often undergo surgery and radiation – their survival is not necessarily correspondingly better than an older patient with colorectal cancer.

So that suggests to us that maybe these cancers are indeed biologically different and perhaps more aggressive or perhaps less responsive to treatment. And so that is some of the focus of our research too, to understand what is actually different about these cancers and how they respond to treatment.

Dr. Sumanta (Monty) Pal: It's such a paradox, isn't it, right? Because you just brought this to my mind. I guess on the one hand, our younger patients may be able to tolerate perhaps a greater amount of chemotherapy, targeted therapy, etc. But you're absolutely right. I mean, they do sort of have these lingering issues with side effects that may persist for much longer than the 80- or 90-year-old that we're treating in the clinic. I mean, these tend to be sort of lifelong consequences and sequelae that they're dealing with. So that really does evolve to be a challenge. You've kind of changed my mindset there a little bit.

Dr. Kimmie Ng: Yeah, I do think survivorship issues and long-term complications of therapy do need to be considered, especially for a young person who we hope will live a very, very long time. And so part of the work that our Young-Onset Colorectal Cancer Center is doing, we are participating in a pilot navigation study where we navigate patients to survivorship earlier than we typically would, perhaps, for an older patient. And that's so we can get a head start on addressing some of those potential complications of therapy and hopefully mitigate them so that they don't become an issue long term.

Dr. Sumanta (Monty) Pal: Do you think there's a role for de-escalation studies formally in these young populations of patients?

Dr. Kimmie Ng: I think de-escalation studies are important overall, and specifically for locally advanced rectal cancer, which again is one of the most common types of colorectal cancer diagnosed in our young patients, there are certain populations that may be able to forgo the radiation treatment to the pelvis, for example, and there's more and more patients who now may become candidates for non-operative management where they may not necessarily need to have their rectal cancer surgically removed. And elimination potentially of both of those modalities of treatment can really avoid some of the most serious and morbid complications that often occur with these treatments.

Dr. Sumanta (Monty) Pal: Really interesting. Now, this is not and will never be a political podcast, but you know, obviously we're dealing with the consequences of changes on funding and so forth that have evolved over time. And I think it's worth sort of speculating how the landscape of research may change on account of that. Could you comment perhaps a little bit on how some of the funding cuts that we've seen recently at the NIH might affect the body of work that you're so integrally involved in?

Dr. Kimmie Ng: I am honestly very worried about the current funding environment. Colorectal cancer is the third most commonly diagnosed cancer among men and women in the United States and globally, and when you combine men and women together, the second leading cause of cancer death. But proportionally, we receive much less funding for colorectal cancer compared to other cancer types. And my thoughts have always been that perhaps this is because there is this stigma around colorectal cancer and maybe some of the symptoms associated with colorectal cancer.

And so on top of that, to have additional challenges in obtaining funding, I worry what it will do to the pace of progress for especially young patients with this disease. Also, because of some new stipulations that perhaps international collaborations are being discouraged, I also worry about that aspect of it because young-onset colorectal cancer and gastrointestinal cancers in general is a global phenomenon happening in multiple countries around the world. And if we are to understand what the environmental factors are affecting the different rates of rise in these different countries, we do so much need that international collaboration.

So yes, I am worried, and I do hope that conversations like this will spark an awareness of the need for more funding and continued funding into this disease.

Dr. Sumanta (Monty) Pal: I will say that, and the audience can't see this because this is an audio program, but I'm wearing my Southwest Oncology shirt here, a SWOG, and it's one of the National Cancer Institute-funded cooperative groups. And you know, I was recently dismayed to find that, you know, funding got cut for international collaborations and enrollment in South America and Latin America. And this was traditionally actually a mainstay of our enrollment for many trials, including trials in rare cancers that present themselves in younger patients in the GU space. So, I completely agree with you. We've got to do something to address this funding issue to make sure that this body of work, both yours and mine, continues, without a doubt.

Kimmie, this has been a delightful conversation. I really want to thank you for, you know, leading the charge in the young-onset colorectal cancer space, and you've done so much tremendous work here.

Dr. Kimmie Ng: Thank you for having me.

Dr. Sumanta (Monty) Pal: If you value the insights that you hear on the ASCO Daily News Podcast, please rate, review, and subscribe wherever you get your podcasts. And again, thank you for joining us today.

Disclaimer: The purpose of this podcast is to educate and to inform. This is not a substitute for professional medical care and is not intended for use in the diagnosis or treatment of individual conditions. Guests on this podcast express their own opinions, experience, and conclusions. Guest statements on the podcast do not express the opinions of ASCO. The mention of any product, service, organization, activity, or therapy should not be construed as an ASCO endorsement.

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Dr. Sumanta (Monty) Pal

@montypal

Dr. Kimmie Ng

@KimmieNgMD

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Disclosures:  

Dr. Sumanta (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. Kimmie Ng:

Honoraria: Seagen, GlaxoSmithKline

Consulting or Advisory Role: CytomX Therapeutics, Jazz Pharmaceuticals, Revolution Medicines, Abbvie, Bayer, Pfizer, Agenus, Johnson & Johnson/Janssen, Etiome, AstraZeneca

Research Funding (Inst.): Pharmavite, Janssen

Other Relationship: JAMA