Surgery may offer survival advantage in certain metastatic breast cancers

December 22, 2020

Surgery, in addition to treatments like chemotherapy and radiation therapy, may increase the length of survival for metastatic breast cancer patients, according to Penn State College of Medicine and Penn State Cancer Institute researchers. They studied nearly 13,000 stage four breast cancer patients and found that those who had surgery in addition to their other treatments had a survival advantage over those who had other treatments alone.

Stage four breast cancer accounts for 6% of newly diagnosed breast cancer cases. Systemic therapy, which may include treatments like chemotherapy, hormone therapies and immunotherapies, is routinely part of treatment plans for those patients. The benefits of surgery to remove the primary breast cancer are currently only recommended for relieving symptoms of advanced breast cancer such as pain and bleeding.

Surgery is the standard of care for some other types of cancers that have spread from the site of origin to another part of the body, known as metastatic cancers. Dr. Kelly Stahl, surgical resident and lead author of the study published in the Annals of Surgical Oncology, said that previous studies evaluating surgical interventions for metastatic breast cancer had conflicting results which has led to a lack of consensus among clinicians and researchers.

"Results from previous trials evaluating surgical benefit in metastatic breast cancer patients have been questioned because of the small number of participants or the fact that patients weren't also receiving chemotherapy or other systemic therapies," Stahl said. "We felt another key factor missing from those studies was whether the biologic subtype of breast cancer affected the survival rates in relation to surgical intervention."

Stahl worked with Dr. Daleela Dodge and Chan Shen to identify 12,838 stage four breast cancer patients from the National Cancer Database from 2010-2015 and whether these patients' cancer cells had a growth-promoting protein called HER2 and hormone receptors for estrogen and progesterone, which can fuel cancer growth. The researchers said knowing these characteristics of a cancer's biological subtype can help determine which treatment plans may be effective.

Stahl studied patients who either had systemic therapy alone, had systemic therapy and surgery, or had systemic therapy, surgery and radiation. She and her coauthors then evaluated whether certain biologic subtypes and timing of chemotherapy were associated with survival advantages.

"We evaluated whether the hormone status had an influence on surgical benefit in these treatment-responsive breast cancer patients," said Dodge, an associate professor of surgery and humanities. "Some types of breast cancer, especially like triple negative, where the cancer is hormone receptor and HER2 negative, are not very responsive to treatment. So our goal was to see if surgery made a difference in metastatic breast cancers that were responsive to treatment."

The researchers excluded patients who died within six months of their diagnoses, in order to ensure that treatment-responsive cancers were being studied. They found that patients with a surgical intervention tended to have a longer length of survival compared to patients with other treatment plans. Patients whose cancers were HER2 positive especially saw prolonged survival when their treatment plan included surgery.

Stahl and her coauthors further analyzed the patients who received surgery to see whether receiving chemotherapy before or after surgery had an impact on their length of survival. They found that regardless of hormone receptor or HER2 status, patients who received systemic therapy -- including chemotherapy and targeted treatments -- before surgery tended to live longer than those who had surgery before systemic treatment.

"Not only did we find that surgery may be beneficial for treatment-responsive metastatic breast cancer patients, we also uncovered that getting chemotherapy before that surgery had the greatest survival advantage in patients with positive HER2 and estrogen and progesterone receptor status," said Shen, associate professor of surgery.

The researchers said that randomized, controlled trials evaluating the role of surgery after systemic therapy in a younger demographic with minimally metastatic cancers could be used to confirm their results, but said that patient resistance to randomization in trials like this have resulted in poor study recruitment. Therefore, they encourage clinicians to evaluate real-world evidence, including their study, to choose optimal treatment for metastatic breast cancer patients.

"Stage four breast cancer patients who are responsive to systemic therapy may be able to benefit from the addition of surgery regardless of their biologic subtype," Stahl said.
-end-
William Wong, Ashton Brooks, Christopher McLaughlin, Elizabeth Olecki, Joseph Lewcun, Kristina Newport and Monali Vasekar of Penn State College of Medicine also contributed to this research.

The authors declare no conflicts of interest or specific financial support.

Penn State

Related Breast Cancer Articles from Brightsurf:

Oncotarget: IGF2 expression in breast cancer tumors and in breast cancer cells
The Oncotarget authors propose that methylation of DVDMR represents a novel epigenetic biomarker that determines the levels of IGF2 protein expression in breast cancer.

Breast cancer: AI predicts which pre-malignant breast lesions will progress to advanced cancer
New research at Case Western Reserve University in Cleveland, Ohio, could help better determine which patients diagnosed with the pre-malignant breast cancer commonly as stage 0 are likely to progress to invasive breast cancer and therefore might benefit from additional therapy over and above surgery alone.

Partial breast irradiation effective treatment option for low-risk breast cancer
Partial breast irradiation produces similar long-term survival rates and risk for recurrence compared with whole breast irradiation for many women with low-risk, early stage breast cancer, according to new clinical data from a national clinical trial involving researchers from The Ohio State University Comprehensive Cancer Center - Arthur G.

Breast screening linked to 60 per cent lower risk of breast cancer death in first 10 years
Women who take part in breast screening have a significantly greater benefit from treatments than those who are not screened, according to a study of more than 50,000 women.

More clues revealed in link between normal breast changes and invasive breast cancer
A research team, led by investigators from Georgetown Lombardi Comprehensive Cancer Center, details how a natural and dramatic process -- changes in mammary glands to accommodate breastfeeding -- uses a molecular process believed to contribute to survival of pre-malignant breast cells.

Breast tissue tumor suppressor PTEN: A potential Achilles heel for breast cancer cells
A highly collaborative team of researchers at the Medical University of South Carolina and Ohio State University report in Nature Communications that they have identified a novel pathway for connective tissue PTEN in breast cancer cell response to radiotherapy.

Computers equal radiologists in assessing breast density and associated breast cancer risk
Automated breast-density evaluation was just as accurate in predicting women's risk of breast cancer, found and not found by mammography, as subjective evaluation done by radiologists, in a study led by researchers at UC San Francisco and Mayo Clinic.

Blood test can effectively rule out breast cancer, regardless of breast density
A new study published in PLOS ONE demonstrates that Videssa® Breast, a multi-protein biomarker blood test for breast cancer, is unaffected by breast density and can reliably rule out breast cancer in women with both dense and non-dense breast tissue.

Study shows influence of surgeons on likelihood of removal of healthy breast after breast cancer dia
Attending surgeons can have a strong influence on whether a patient undergoes contralateral prophylactic mastectomy after a diagnosis of breast cancer, according to a study published by JAMA Surgery.

Young breast cancer patients undergoing breast conserving surgery see improved prognosis
A new analysis indicates that breast cancer prognoses have improved over time in young women treated with breast conserving surgery.

Read More: Breast Cancer News and Breast Cancer Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.