Hyman Muss, MD, discusses special considerations that should be taken when treating older patients with HER2-positive or triple-negative breast cancer.
Hyman Muss, MD
When treating older patients with HER2-positive or triple-negative breast cancer (TNBC), life expectancy should always be taken into consideration when deciding the goals of treatment, according to a presentation by geriatric oncologist Hyman Muss, MD, at the 2017 Lynn Sage Breast Cancer Symposium.
"The real question isn't how old the patient is, but what their life expectancy is," said geriatric oncologist Hyman Muss, MD, of the University of North Carolina School of Medicine, at the symposium, which was sponsored by Northwestern University's Robert H. Lurie Comprehensive Cancer Center. "Then you calculate the risks and benefits of toxicity, and then put it all together with the defining goals of treatment. And the goal is not always longevity."
For example, while younger patients can still function reasonably well during chemotherapy and will have time to recover from side effects, older patients may be debilitated to the point where they need to move from independent to assisted living, or even full nursing home care. Moreover, patients older than 65 have significantly greater risk of being hospitalized for side effects from chemotherapy. One study showed that for some regimens, their risk was triple that of patients younger than 65.1
"This is the worst thing for an older patient," Muss said. "It can be the beginning of going to a skilled nursing facility, falling, and having numerous other problems." Staying out of the hospital may take priority over gaining the benefits of chemotherapy, which may be marginal any way if the patient's tumor is 1 cm or smaller, Muss said.
More than 40% of new breast cancer diagnoses are in women 65 and older. In the United States, the median age for a breast cancer diagnosis is 62 years and the median age of death is 68 years, Muss said. But there are also 3 million breast cancer survivors who are older than 65, according to the SEER database.
For older patients, Muss said, clinicians must ask 2 questions that they might not ask for younger ones:
Using a life expectancy calculator from the University of California at San Francisco,2Muss walked through a comparison of 2 patients in their late 70s. The first had excellent health according to her own assessment, had no health issues besides cancer, and lived entirely independently. Her 5-year all-cause mortality risk was between 4% and 23%. The second, a former smoker, had diabetes and COPD and one hospitalization in the past year, rated her own health as fair. Her 5-year mortality risk was 69%.
Muss recommended PREDICT,3a tool from the United Kingdom’s National Health Service that helps clinicians and patients evaluate the benefits of various treatment options following breast cancer surgery. It presents survival estimates with and without adjuvant therapies. The model takes into account all-cause mortality, and recommends adjuvant therapy only for patients with a 5% or greater chance of surviving for 10 years. If it's less than 3%, adjuvant therapy is not offered at all because the side effects exceed the potential benefit.
While healthy older patients can make treatment choices similar to younger patients, and truly frail ones may need only palliative care, there's an “in between" group that can be treated successfully with some preparation to address their potential vulnerabilities. For example, Muss strongly recommended a cardiology consult if an older patient has risk factors for congestive heart failure. Proactive beta-blockers or ACE inhibitors may help reduce toxicity during treatment.
Muss said sentinel node biopsies might be worth the time and cost to help an older patient decide whether the benefits of chemotherapy are worth the risks and the quality of life impact, especially in cases of triple-negative breast cancers where the tumor is 1 cm or 2 cm. "If they say they are absolutely never going to consider chemo, then don't do it," he said. "But sometimes when people say they will never do chemo, it's before the fact, and when they get the results it changes their mind."
The first patient should receive the same treatment as a younger patient if her cancer is likely to recur within 5 years, Muss said. The second one has both a higher likelihood of dying from something else before her cancer recurs, and a higher risk of being debilitated by chemotherapy, making the treatment decision much less straightforward.