Breast Cancer Cases to Rise Globally by 2050, Study Finds | Healio

The global incidence of breast cancer is poised for a significant increase, with projections indicating over 3.5 million new cases annually by 2050. This represents a substantial rise from the approximately 2.3 million cases diagnosed in 2023, according to new research published in The Lancet Oncology. Alongside this increase in cases, deaths related to breast cancer are also expected to climb, with a projected 44% rise during the same period. While advancements in screening and treatment have improved outcomes in high-income countries, the growing burden of the disease is shifting towards low- and lower-middle-income nations, where access to quality care remains a significant challenge.

Shifting Global Burden and Disparities

The study, led by Kayleigh Bhangdia, MS, a research scientist at the Institute for Health Metrics and Evaluation (IHME) at the University of Washington, Seattle, analyzed breast cancer trends and burden data from 204 countries spanning 1990 to 2023. Researchers utilized data from population-based cancer registries, vital registration systems, and interviews with family members and caregivers to create projections through 2050. The findings highlight a stark disparity in breast cancer outcomes, with a disproportionate impact on women in lower-resource settings.

In 2023, an estimated 2.3 million (95% uncertainty interval [UI], 2.01-2.61) new breast cancer cases were diagnosed globally, with 73% occurring in high- or upper-middle-income countries. However, 764,000 (95% UI, 672,000-854,000) deaths occurred worldwide that year. From 1990 to 2023, the total years of healthy life lost due to breast cancer – measured as disability-adjusted life-years (DALYs) – more than doubled, increasing from 11.7 million to 24.1 million. Notably, women in low- and lower-middle-income countries account for over 45% of these DALYs, despite representing only 27% of new breast cancer cases annually. This underscores the impact of later-stage diagnoses and limited access to effective treatment in these regions.

Beyond Incidence: Years of Healthy Life Lost

The concept of DALYs is crucial to understanding the true impact of breast cancer. It’s not simply about the number of cases, but the cumulative effect of illness and premature death on a population’s health. A higher DALY rate indicates a greater loss of potential years of healthy life. The disproportionate DALY burden in low- and lower-middle-income countries emphasizes the urgent need for improved access to early detection and treatment in these areas.

Modifiable Risk Factors and Declining Trends

The research identified several modifiable risk factors contributing to breast cancer DALYs, including tobacco use, high red meat intake, high body mass index (BMI), excessive alcohol consumption, low physical activity, and high fasting plasma glucose. These factors accounted for 28.3% (95% UI, 16.6%-38.9%) of breast cancer DALYs in 2023. However, the study also revealed positive trends: worldwide breast cancer burden linked to high alcohol use decreased by 47% and tobacco use by 28% between 1990 and 2023. This suggests that public health interventions targeting these behaviors can have a measurable impact on reducing the overall burden of the disease. Research suggests many women are unaware of the preventative role of diet, highlighting a need for increased education.

Age-Related Incidence and Changing Patterns

In 2023, the incidence rate of breast cancer was 160.7 per 100,000 women aged 55 years or older, more than three times higher than the rate among women aged 20 to 54 years (50.4 per 100,000). While breast cancer is generally considered a disease of older women, the study found a 29% increase in new cases among younger women (20-54 years) from 1990 to 2023. This trend warrants further investigation, as it may reflect changes in risk factors, reproductive patterns, or earlier detection methods.

Projected Increases and the Need for Collaborative Efforts

The projections for 2050 are concerning, with annual breast cancer cases expected to reach 3.56 million (95% UI, 2.29-4.83) and resulting deaths to reach 1.37 million (95% UI, 0.841-2.02). Addressing this growing burden requires a multifaceted approach, emphasizing both prevention and improved access to care.

“There are tremendous opportunities to alter the trajectory of breast cancer risk for the next generation,” says Marie Ng, PhD, a study co-author and affiliate associate professor at IHME. “Targeting known risk factors through public health policies and making healthier choices more accessible, while working with individuals to take action to reduce obesity and high blood sugar, is crucial to halting the rise in breast cancers worldwide.”

Strengthening Health Systems and Ensuring Access

The study underscores the critical need for well-functioning health systems capable of early diagnosis and comprehensive treatment of breast cancer in all countries. Lisa M. Force, MD, MPH, a study co-author and assistant professor at IHME, emphasizes the importance of reducing the cost of breast cancer therapies and ensuring that universal health coverage includes essential breast cancer care. Improving access to care is a key focus of ongoing initiatives.

What’s Next: Surveillance, Research, and Policy Updates

The findings from this study will likely inform ongoing and future public health initiatives aimed at reducing the global burden of breast cancer. Continued surveillance of incidence and mortality rates is essential to track progress and identify emerging trends. Further research is needed to understand the underlying causes of the increasing incidence among younger women and to develop more effective prevention strategies. Regular reviews of clinical guidelines and policy recommendations will be crucial to ensure that healthcare systems are equipped to meet the evolving needs of patients. The World Health Organization (WHO) regularly updates its guidance on breast cancer screening and treatment, and national health authorities will likely adapt their policies based on the latest evidence. The WHO provides comprehensive information on breast cancer, including prevention, early detection, and treatment options.

tackling the projected rise in breast cancer cases requires a collaborative, global effort focused on prevention, early detection, and equitable access to high-quality care.