Advances in breast cancer detection and treatment over the past decades have led to an increase in the number of women diagnosed at earlier stages and successfully treated, ushering in a new era of survivorship.
According to the American Cancer Society, there are currently roughly four million breast cancer survivors in the United States, including those still receiving treatment. The mortality rates for women with breast cancer have been decreasing since 1989, with an overall decline of 42% through 2021.
As the population of breast cancer survivors continues to grow, developing and delivering comprehensive survivorship care is crucial, Thelma Brown told attendees at the American Society of Clinical Oncology (ASCO) 2024 annual meeting. Brown’s talk was part of an educational session focused on addressing issues among early breast cancer survivors, evolving practices in breast cancer surveillance, and mitigating recurrence risk.
The challenges following breast cancer diagnosis and treatment can be both visible and invisible, said Brown, a patient advocate and member of the Breast Cancer Working Group at the University of Alabama at Birmingham, Alabama.
Up to 90% of early breast cancer survivors experience long-term effects from treatment, which often include fatigue, loss of mobility, chronic pain, peripheral neuropathy, lymphedema, and infertility.
Survivors face an elevated risk for depression, anxiety, and fear of recurrence. “Fear of recurrence is a big issue, and it’s almost universal,” she noted.
Cancer treatment is also costly, leading to financial toxicity for many patients, which also “affects adherence to treatment and overall family well-being,” Brown explained. Survivors may struggle to access financial assistance due to complex eligibility requirements and a lack of awareness about available resources.
There is a need for holistic and coordinated survivorship care that includes management of long-term effects and surveillance for recurrence to help breast cancer survivors to transition from merely surviving to thriving, said Brown.
Surveilling and Mitigating Recurrence
Surveillance in patients with breast cancer post treatment remains a debated area, particularly when it comes to detecting distant recurrences, David Cescon, MD, PhD, with Princess Margaret Cancer Center, University Health Network, Toronto, Ontario, Canada, said in his talk.
While breast imaging standards are well established, systemic surveillance through imaging and laboratory tests for asymptomatic patients lacks consensus and uniform guidelines, he explained.
Several clinical trials conducted from the late 1980s to the early 2000s showed no survival benefit from intensive surveillance strategies, including imaging and laboratory tests, compared to routine clinical follow-up. Some studies even demonstrated a trend toward harm, given the number of false positives.
These studies formed the basis for guidelines that discourage surveillance among asymptomatic survivors. Currently, no major guideline organization — the National Comprehensive Cancer Network, ASCO, and the European Society for Medical Oncology — recommends routine (nonbreast) radiologic surveillance or laboratory tests for detecting asymptomatic distant breast cancer recurrence, Cescon said.
Yet, that may change in the coming years, he told attendees.
Ongoing prospective studies will hopefully generate high-quality evidence on the effectiveness of modern surveillance techniques, particularly detection of circulating tumor DNA (ctDNA) and its effect on survival and quality of life, said Cescon.
These liquid biopsy assays have shown promise in identifying minimal residual disease before radiographic recurrence, he explained. Retrospective studies suggest high prognostic value, with nearly all patients with detectable ctDNA post therapy experiencing recurrence.
He cautioned, however, that while sensitive ctDNA tests exist and have clinical validity in identifying minimal residual disease, “their clinical utility has not yet been demonstrated,” Cescon said, adding that any surveillance strategy must consider the psychological effect of frequent testing and the potential for false positives or negatives.
The ultimate goal is preventing disease recurrence, said Neil Iyengar, MD, with Memorial Sloan Kettering Cancer Center in New York, in his talk on mitigating recurrence risk.
Lifestyle modifications are an important targeted intervention for patients entering the survivorship phase, with a “robust level of evidence” supporting their use to mitigate adverse effects associated with cancer therapy and improve quality of life, he told attendees. Most notably, smoking cessation, healthy dietary patterns, physical activity, and reduced alcohol have been associated with improvements in breast cancer outcomes.
Going forward, it will be important to “understand the antitumor potential of lifestyle modification and how we can wield this type of intervention as a precision tool to potentially enhance the effects of cancer therapy and potentially cancer biology,” said Iyengar.
Brown disclosed relationships with AstraZeneca. Cescon disclosed relationships with AstraZeneca, Gilead Sciences, Daiichi Sankyo Europe GmbH, Eisai, GlaxoSmithKline, and other companies. Iyengar disclosed relationships with Curio Science, DAVA Oncology, Novartis, Pfizer, and others.
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