Metastatic Breast Cancer Awareness Day

Celebrated on 10/13/2026

Quick Fact

Metastatic Breast Cancer Awareness Day, observed on October 13, was established to highlight the unique challenges of stage IV breast cancer, which accounts for about 30% of initial diagnoses and nearly all breast cancer deaths. Unlike early-stage breast cancer, MBC cannot be cured, but treatments can extend and improve quality of life. This day aims to ensure that the 168,000 women in the US living with MBC are not forgotten in the broader breast cancer conversation.

Origins and Establishment of Metastatic Breast Cancer Awareness Day

Metastatic Breast Cancer Awareness Day was first observed on October 13, 2009, following a resolution introduced by Congresswoman Rosa DeLauro (CT-3) and Senator Dianne Feinstein (CA). The day was created to address the lack of awareness and research funding specifically for metastatic breast cancer (MBC), also known as Stage IV breast cancer, which occurs when cancer spreads beyond the breast to other organs. Advocacy groups, including the Metastatic Breast Cancer Network (MBCN) and Living Beyond Breast Cancer, led the effort to establish a day dedicated to the unique needs of the MBC community.

Evolution and Modern Commemoration

Since its inception, Metastatic Breast Cancer Awareness Day has grown in visibility, with events such as webinars, social media campaigns, and educational programs focused on MBC research and patient support. In 2010, the Metastatic Breast Cancer Alliance was formed to unite organizations and accelerate research. Modern commemoration includes wearing green (the color for MBC awareness), sharing stories using hashtags like #MBCawareness, and advocating for increased funding for MBC-specific research. The day also emphasizes the importance of including MBC patients in clinical trials and addressing disparities in care.

Facts & General Observations - Approximately 30% of women initially diagnosed with early-stage breast cancer will eventually develop metastatic disease. - The 5-year relative survival rate for metastatic breast cancer is about 29%, compared to 99% for localized breast cancer. - Despite representing only a small fraction of breast cancer cases, MBC research receives less than 10% of overall breast cancer research funding.

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