Dr. Chino talks with Dr. Atif Khan and Dr. Lola Fayanju about the shift in breast cancer management from reducing locoregional recurrence and improving breast cancer mortality to deintensification, shared decision making, and improved quality of life. This discussion will be based off a JCO OP editorial published in late 2024 called "Contextual Framework for Understanding Treatment De-Escalation in Patients With Breast Cancer."

Transcript

Dr. Fumiko Chino: Hello, and welcome to Put into Practice, the podcast for JCO Oncology Practice. I'm Dr. Fumiko Chino, an Assistant Professor in Radiation Oncology at MD Anderson Cancer Center with a research focus on access, affordability, and equity.

Breast cancer treatment has made significant strides in the past century, with the five-year survival rate rising from less than 5% in the early 20th century to around 90% in the present day. In today's episode, we'll be discussing the shift in breast cancer management from reducing local-regional recurrence and improving breast cancer mortality to deintensification, shared decision-making, and improved quality of life. This discussion will be based off of a JCO OP editorial published in late 2024 called "Contextual Framework for Understanding Treatment De-escalation in Patients with Breast Cancer."

I'm excited to welcome two breast cancer experts as guests today: the first author of this editorial and radiation oncologist, as well as a health services researcher and breast surgeon. They're both engaged in research to improve outcomes for breast cancer, including treatment optimization.

Dr. Atif Khan, MD, MS, is a full attending breast cancer disease site leader and Service Chief in the Department of Radiation Oncology at Memorial Sloan Kettering Cancer Center. He is also on the steering committee of the Clinical Research Innovation Consortium, as well as on the Research Council at MSK. Dr. Khan is the chair of the breast section of oral examiners for the American Board of Radiology and is active in NRG, helping develop and lead key clinical trials to optimize radiation delivery for breast cancer. Dr. Khan is also a translational science investigator of novel radiosensitizers.

Dr. Oluwadamilola "Lola" Fayanju, MD, MA, MPHS, is the Helen O. Dickens Presidential Associate Professor and Chief of the Division of Breast Surgery at the Perelman School of Medicine at the University of Pennsylvania. She is also Surgical Director of the Rena Rowan Breast Center at the Abramson Cancer Center, Program Director for Implementation Innovation at the Penn Center for Cancer Care Innovation, and a Senior Fellow at the Leonard Davis Institute of Health Economics at Penn.

Our full disclosures are available in the transcript of this episode, and we've already agreed to go by our first names for the podcast today.

Atif and Lola, it's wonderful to speak to you today.

Dr. Atif Khan: It's a pleasure to be here. Thank you for inviting me, Fumiko.

Dr. Lola Fayanju: Yeah, thanks for having me.

Dr. Fumiko Chino: The topic today is treatment de-escalation for breast cancer, loosely based on the editorial that Atif wrote in JCO OP outlining a conceptual framework, which is primarily focused on local-regional therapies, i.e., radiation and surgery for breast cancer. The concept of rightsizing treatment has really been developing over the past three decades, spearheaded by surgical de-escalation. Lola, do you mind giving me a brief overview of surgical de-escalation as you have seen it throughout history and as currently realized in your practice?

Dr. Lola Fayanju: Happy to. So, you know, it's one of those things where I think increasingly we recognize that breast cancer is a heterogeneous condition that shares an anatomical space. And with that refined understanding of treating breast cancer, we're no longer using a very blunt and large hammer to deal with what is actually a constellation of nails. So originally, when people used to treat breast cancer, the idea was that you wanted to take as much tissue as possible. And this originated the Halstedian mastectomy, which was a radical mastectomy that often involved removal of not only all the breast and axillary tissue but also the pectoralis muscle, even some accessory nerves, that really left people with incredibly deformed body habitus as well as compromised function. And in part, that was not an unreasonable approach given that disease was often presenting in a locally advanced fashion.

However, as we have been increasingly able to detect disease at an asymptomatic, pre-palpable state, but also as our ability to treat disease at a systemic fashion has become more effective, we've been able to move from the Halstedian mastectomy to then the modified radical mastectomy, and then ultimately to even less axillary surgery, as well as less breast surgery, such that there was the advent of the lumpectomy pioneered by Bernie Fisher in the 1980s, as well as sentinel lymph node biopsy pioneered by Armando Giuliano and Don Morton in the 1990s and early 2000s. And what this allowed us to do, again, is to achieve similar if not better outcomes, because we were again catching disease at an earlier state thanks to screening mammography, but also able to provide more personalized, less morbid care that focused on just the cancer at hand with the additional adjuvant therapy of radiation to provide comparable survival to mastectomy.

What this has allowed us to do is also think about the order in which we do treatment, that is allowing people to potentially get systemic therapy first in order to convert from a more morbid procedure to a smaller, less morbid procedure. So, we've made a huge number of strides both with regards to surgery in the breast as well as surgery in the axilla, and that's been facilitated by a combination of knowing more about disease, being able to be more systemic and holistic in its treatment, and also recognizing that more is not always more. The last thing I will say is that we've also been aided not only by the adjunct radiation and systemic therapies, but also by the ability of our radiologists to localize pre-existing cancer such that we can target the area and just the area of concern, whether it's through targeted axillary dissection or through sampling a previously positive area of the breast, such that we can again be more selective in terms of the surgery people get after systemic therapy.

Dr. Fumiko Chino: Thanks for that great overview, and I really love it how you have highlighted that it's all of these advances that allow us to customize the treatment to the individual. So it's not one size fits all with cancer care. We're really trying to make a customized plan and really rallying all of the modern technologies to make sure that we're rightsizing the treatments for the individual. And I think that provides a lot of benefits for patients.

Atif, can you highlight some of the key steps to de-escalate radiation for breast cancer?

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