Dr. Pedro Barata and Dr. Kathryn Schmitz discuss evidence-based exercise oncology programs, how to incorporate exercise into cancer care and connect the right patient to the right program, and ultimately build a culture of exercise in oncology.

TRANSCRIPT

Dr. Pedro Barata: Hello, and welcome to By the Book, a podcast series from ASCO that features compelling perspectives from authors and editors of the ASCO Educational Book. I'm Dr. Pedro Barata. I'm a medical oncologist and a clinical trialist at the University Hospital Seidman Cancer Center and an associate professor of medicine at Case Western Reserve University in Cleveland, Ohio. I'm also happy to serve as a deputy editor for the ASCO Educational Book.

Today, we'll be talking about exercise. We have plenty of evidence that exercise benefits symptoms, improves the quality of life of patients, and actually has been shown to reduce risk of recurrence of cancer but also improve survival. And I think that's increasingly clear as data emerges.

Today, I'm delighted to be speaking to Dr. Kathryn Schmitz. She's a leading expert on integrating exercise into cancer care. Dr. Schmitz serves as the deputy director of the University of Pittsburgh Hillman Cancer Center and also a professor of hematology-oncology at University of Pittsburgh Medical School. She's the senior author of a fantastic article in the ASCO Educational Book that's titled "Implementation Science as the Secret Sauce for Integrating Exercise Screening and Triage Pathways in Oncology." She also led a really compelling piece that just got published in JCO titled "If Exercise Were a Pill, We'd All Prescribe It to Patients With Cancer. But It's Not" So I'm thrilled to have Dr. Schmitz joining us today and helping us explore evidence-based exercise oncology programs, how to incorporate exercise into cancer care, and also how to connect the right patient to the right program.

So with that, welcome, Dr. Schmitz. Thank you so much for taking the time to chat with us.

Dr. Kathryn Schmitz: Thank you for the opportunity.

Dr. Pedro Barata: One of the highlights of ASCO last year and practice changing, in my opinion, data out of The New England [Journal of Medicine] is called the CHALLENGE trial. It did provide high level evidence that a structured, supervised exercise program could improve both disease-free survival and overall survival. This is a study in the GI world, but I think it got a lot of attraction and attention beyond the GI world, across solid tumors, really. Could you give us a little brief recap of that trial and what have you seen as being the impact in practices around oncology?

Dr. Kathryn Schmitz: So, CHALLENGE was very exciting. Prior to CHALLENGE, there were any number of observational studies that indicated that there was a relationship between being more physically active and reduced recurrence and improved overall survival for colon cancer in particular. You know, notably, in 2006, Jeff Meyerhardt published two papers in the same journal, of the same issue of JCO, showing very, very similar data from two very large studies. And those were studies number five and six in this area. You know, there's a lot of evidence observationally, but we don't generally change clinical practice on the basis of observational data. So, we were all waiting very impatiently for the results of the CHALLENGE trial. And it was very exciting to be in the front row when the results were reported out and to be part of the group with a standing ovation for the authors when it was presented.

To summarize, 889 colon cancer patients, stage II and III, were randomized into either a structured exercise program or a health education control comparison group and followed for an average of 7.9 years. And the structured exercise group had a 27% reduced risk of recurrence and a 38% improvement in overall survival.

One of the things that's really notable about this is that what we typically expect is that when we go from the observational literature to the clinical trial literature, that we expect effects to go down. We expect to see a larger effect in the observational than in the RCT land, and that did not happen here. We actually see an effect that matches what we've seen in observational literature, which is really, really exciting.

And, you know, one of the reasons why this has been so exciting across not just GI but other cancers is the notable finding of a reduced risk of second primaries. So, they only observed two breast cancer second primaries in the treatment group and 12 in the comparison group. And overall, they reduced the second primaries occurrence, hazard ratio was 0.5, a 50% reduction of second primaries, which is just remarkable. It really got everybody very, very excited. And now the big question, of course, is, all right, how do I do this? How do I make this happen?

The thing to note is that what they did in CHALLENGE is probably not doable in your clinic tomorrow. It's a heavy intervention. The number of touchpoints from staff is extensive, and the amount of time needed from staff for the coaching and supervised exercise is extensive as well. The criteria for getting people into the program required that people go through a series of blood tests and imaging tests that would just simply not be possible for the average community oncologist. So I'm guessing that you're going to ask me some questions about how we do this.

Dr. Pedro Barata: Right. That's a fantastic segue. That's exactly right. Walk us through maybe starting by, what does that mean?

Dr. Kathryn Schmitz: The first thing to say is I have to go back to the observational literature. And the observational literature shows really compellingly that we have a strong reduction of breast cancer recurrence and mortality from being more physically active, prostate cancer recurrence and mortality, and colon cancer recurrence and mortality. I find it very difficult to believe in this day and age, in our current environment, if you will, that we are ever going to have the equivalent of CHALLENGE for prostate or for breast cancer. There is an ongoing study in prostate that's led by some Australian researchers, but I just don't think that it's likely that we're going to mount something similar for another tumor site. We have tremendous correlative data that indicates that there are a number of biomarkers and biological pathways through which breast, colon, and prostate cancer would be reduced in recurrence if people were more physically active.

And so, there is really, from my thinking, very little to state that it would be just a colon cancer effect. And so this is something we probably can enact in more than just the colon cancer community, overall, which is great news, and it makes it easier for us to be able to enact this type of programming.

Dr. Pedro Barata: One of the things that comes up perhaps often is, if I were the leader of the cancer center and were to incentivize the different care teams to implement an exercise program at each level: GI team, GU, breast, thoracic, etc. How do we do that?

Dr. Kathryn Schmitz: So, I want to give you an analogy. You're a medical oncologist, and you prescribe your patients chemotherapy. Now, just imagine, if you will, what would happen and how likely it would be for your patients to get chemotherapy if there was no chemoinfusion suite. If the chemoinfusion suite disappeared tomorrow and you were to tell your patients, "Go get some chemotherapy," what proportion of those patients do you think would go find all of the equipment necessary and all of the drugs necessary and understand how to dose the chemotherapy for themselves and get that all done? Very few people would do it. So with exercise, why would we be surprised then that our patients don't actually do a whole lot if we just simply tell them to go get some exercise? Exercise is a medicine. It is effective like a medicine. We've shown this through the CHALLENGE trial and many other correlative studies and an ocean of observational data as well.

So the question is, how do we build the infrastructure that is necessary in order for your patients to do this? So the very first thing that has to happen is that somebody has to tell the patient to exercise. We currently do not have a culture of exercise in oncology. We do in heart disease. If you ask the average person on the street, "Is exercise good for your heart?" Anybody with an eighth-grade education is going to say, "Yes, of course," because the American Heart Association has done an amazing job telling everybody that exercise is good for your heart. But what has ASCO done, frankly? Can I be that bold? What has ASCO done to tell patients that they should be exercising during and after their cancer treatment? I'm not sure that I know more than a guideline. There is a guideline, and that's great. And the guideline is very helpful, but I'm not sure that patients know that there's a guideline. ...