Breast cancer study

As breast cancer survivors live longer, their risk of developing other serious medical conditions also increases, according to a Mayo Clinic-led study published in the journal Cancer.

Overall survival of patients with breast cancer in the U.S. has significantly improved over the past two decades. However, as breast cancer survivors live longer, their risk of developing other serious medical conditions also increases, according to a Mayo Clinic-led study published in the journal Cancer.

The retrospective study provides the largest and most recent population-based, long- term analysis to date of non-cancer causes of death among women diagnosed with breast cancer. It also provides a detailed assessment of changes in the risk of each cause of death, compared to those in the general U.S. population over the same period.

The researchers reviewed the data of 754,270 women who had breast cancer diagnosed from 2000 to 2015. Most patients studied were older than 50; 38.6% were older than 64; 37.5% were between 50–64 years; and 23.8% were younger than 50.

The study found:

• The greatest proportion of deaths among those studied occurred within one to five years after diagnosis. Most deaths occurred from breast cancer or other cancers.

• The number of breast cancer-related deaths decreased as more years passed after diagnosis.

• The most common non-cancer causes of death within 10 years of diagnosis were heart disease followed by cerebrovascular disease.

• The most common non-cancer causes of death 10 years or more after diagnosis were heart disease followed by Alzheimer’s disease, cerebrovascular disease and chronic obstructive pulmonary disease.

• There was a statistically significant higher risk of death from chronic liver disease and cirrhosis within five to 10 years after diagnosis, compared to the general U.S. population.

• There was a statistically significant higher risk of death from Alzheimer’s disease, heart disease and non-breast cancers more than 10 years after diagnosis, compared to the general U.S. population.

“Our findings emphasize how important it is for breast cancer survivors to discuss potential long-term health risks with their health care providers so that screenings and tests for other medical conditions could be proactively planned as part of their ongoing care,” says Mohamad Sonbol, M.D., a Mayo Clinic oncologist and senior author of the study.