Dr. John Sweetenham and Dr. Erika Hamilton highlight key abstracts that were presented at ASCO25, including advances in breast and pancreatic cancers as well as remarkable data from the use of structured exercise programs in cancer care.

Transcript

Dr. Sweetenham: Hello, and welcome to the ASCO Daily News Podcast. I’m your host, Dr. John Sweetenham. Today, we’ll be discussing some of the key advances and novel approaches in cancer care that were presented at the 2025 ASCO Annual Meeting.

I’m delighted to be joined again by the chair of the Meeting’s Scientific Program, Dr. Erika Hamilton. She is a medical oncologist and director of breast cancer and gynecologic cancer research at the Sarah Cannon Research Institute in Nashville, Tennessee.

Our full disclosures are available in the transcript of this episode.

Dr. Hamilton, congratulations on a fantastic meeting. From the practice-changing science to the world-renowned speakers at this year’s Meeting, ASCO25 really reflected the amazing progress we’re seeing in oncology today and the enormous opportunities that lie ahead of us. And thanks for coming back on to the podcast today to discuss some of these advances.

Dr. Hamilton: Thanks, Dr. Sweetenham. I'm happy to join you today. It really was an impactful ASCO Annual Meeting. I probably am biased, but some great research was presented this year, and I heard lots of great conversations happening while we were there.

Dr. Sweetenham: Yeah, absolutely. There was a lot of buzz, as well as a lot of media buzz around the meeting this year, and I think that’s probably a good place to start. So I’d like to dive into abstract number LBA3510. This was the CHALLENGE trial, which created a lot of buzz at the meeting and subsequently in the media.

This is the study that was led by the NCI Canada Clinical Trials Group, which was the first randomized phase 3 trial in patients with stage III and high-risk stage II colon cancer, which demonstrated that a post-treatment structured exercise program is both feasible and effective in improving disease-free survival in this patient group.

The study was performed over a long period of time and in many respects is quite remarkable. So, I wonder if you could give us your thoughts about this study and whether you think that this means that our futures are going to be full of structured exercise programs for those patients who may benefit.

Dr. Hamilton: It’s a fantastic question. I think that this abstract did create a lot of buzz. We were very excited when we read it. It was highlighted in one of the Clinical Science Symposium sessions. But briefly, this was a phase 3 randomized trial. It was conducted at 55 centers, so really a broad experience, and patients that had resected colon cancer who completed adjuvant therapy were allowed to participate. There were essentially 2 groups: a structured exercise program, called ‘the exercise group,’ or health education materials alone, so that was called just ‘the health education group.’ And this was a 3-year intervention, so very high quality. The primary end point, as you mentioned, was disease-free survival.

This actually accrued from 2009 to 2024, so quite a lift, and almost 900 patients underwent randomization to the exercise group or the health education group. And at almost 8 years of follow-up, we saw that the disease-free survival was significantly longer in the exercise group than the health education group. This was essentially 80.3% of patients were disease-free in exercise and 73.9% in the health education group. So a difference of over 6 percentage points, which, you know, at least in the breast cancer world, we make decisions about whether to do chemotherapy or not based on these kind of data.

We also looked at overall survival in the exercise group and health education group, and the 8-year overall survival was 90.3% in the exercise group and 83.2% in the health education group. So this was a difference of 7.1%. Still statistically significant.

I think this was really a fantastic effort over more than a decade at over 50 institutions with almost 900 patients, really done in a very systematic, high-intervention way that showed a fantastic result. Absolutely generalizable for patients with colon cancer. We have hints in other cancers that this is beneficial, and frankly, for our patients for other comorbidities, such as cardiovascular, etc., I really think that this is an abstract that deserved the press that it received.

Dr. Sweetenham: Yeah, absolutely, and it is going to be very interesting, I think, over the next 2 or 3 years to see how much impact this particular study might have on programs across the country and across the world actually, in terms of what they do in this kind of adjuvant setting for structured exercise.

Dr. Hamilton: Absolutely.

So let’s move on to Abstract 3006. This was an NCI-led effort comparing genomic testing using ctDNA and tissue from patients with less common cancers who were enrolled in but not eligible for a treatment arm of the NCI-MATCH trial. Tell us about your takeaways from this study.

Dr. Sweetenham: Yeah, so I thought this was a really interesting study based, as you said, on NCI-MATCH. And many of the listeners will probably remember that the original NCI-MATCH study screened almost 6,000 patients to assess eligibility for those who had an actionable mutation. And it turned out that about 60% of the patients who went on to the study had less common tumors, which were defined as anything other than colon, rectum, breast, non–small cell lung cancer, or prostate cancer. And most of those patients lacked an eligible mutation of interest and so didn’t get onto a trial therapy.

But with a great deal of foresight, the study group had actually collected plasma samples from these patients so that they would have the opportunity to look at circulating tumor DNA profiles with the potential being that this might be another way for testing for clinically relevant mutations in some of these less common cancer types.

So initially, they tested more than 2,000 patients, and to make a somewhat complicated story short, there was a subset of five histologies with a larger representation in terms of sample size. And these were cholangiocarcinoma, small cell lung cancer, esophageal cancer, pancreatic, and salivary gland cancer.

And in those particular tumors, when they compared the ctDNA sequencing with the original tumor, there was a concordance there of around 84%, 85%. And in the presentation, the investigators go on to list the specific mutated genes that were identified in each of those tumors.

But I think that the other compelling part of this study from my perspective was not just that concordance, which suggests that there’s an opportunity there for the use of ctDNA instead of tumor biopsies in some of these situations, but what was also interesting was the fact that there were several clinically relevant mutations which were detected only in the circulating tumor DNA. And a couple of examples of those included IDH1 for cholangiocarcinoma, BRAF and p53 in several histologies, and microsatellite instability was most prevalent in small cell lung cancer in the ctDNA.

So I think that what this demonstrates is that liquid biopsy is certainly a viable screening option for patients who are being assessed for matching for targeted therapies in clinical trials. The fact that some of these mutations were only seen in the ctDNA and not in the primary tumor specimen certainly suggests that there’s some tumor heterogeneity. But I think that for me, the most compelling part of this study was the fact that many of these mutations were only picked up in the plasma. And so, as the authors concluded, they believe that a comprehensive gene profiling with circulating tumor DNA probably should be included as a primary screening modality in future trials of targeted therapy of this type.

Dr. Hamilton: Yeah, I think that that’s really interesting and mirrors a lot of data that we’ve been seeing. At least in breast cancer, you know, we still do a biopsy up front to make sure that our markers, we’re still treating the right disease that we think we are. But it really speaks to the utility of using ctDNA for serial monitoring and the emerge...

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