Our sponsors empower RFTC Japan’s mission to eradicate breast cancer through vital awareness and education. Their active participation and generous donations are essential to our work and saving lives.
Hana-me offers free seminars with lectures and hands-on workshops. Master self-exams and dispel myths to empower your health through early breast cancer detection.
Run For The Cure Foundation (RFTC) Japan is a non-profit organization dedicated to saving lives through breast cancer education, early detection, and compassionate support.
Non-invasive breast cancer, also referred to as Stage 0, consists of abnormal cells that are confined to their original location—typically the milk ducts or lobules—and have not spread into the surrounding breast tissue.
Ductal Carcinoma in Situ (DCIS)
The most common non-invasive breast cancer
Cancer cells are confined to the milk ducts
Has not spread to surrounding breast tissue
Highly treatable when detected early
Often found through mammography, before symptoms appear
Normal Cell
Non-invasive Cell
Invasive Cell
Invasive Breast Cancers
Invasive Ductal Carcinoma (IDC)
Most common type of breast cancer
Begins in the milk ducts and spreads into nearby breast tissue
Can spread to lymph nodes and other parts of the body if untreated
Accounts for about 70–80% of invasive breast cancers
Invasive Lobular Carcinoma (ILC)
Starts in the lobules and spreads into surrounding tissue
Second most common invasive type
May be harder to detect on imaging
Often affects both breasts or larger areas of tissue
Less-Common Types of Breast Cancer
Triple-Negative Breast Cancer
Lacks estrogen, progesterone, and HER2 receptors
Tends to grow and spread more quickly
More common in younger women
Treated primarily with chemotherapy and newer targeted therapies
HER2-Positive Breast Cancer
Cancer cells produce excess HER2 protein
Can grow aggressively without treatment
Highly responsive to targeted therapies
Outcomes have improved significantly with modern treatments
Inflammatory Breast Cancer
A rare but aggressive form of breast cancer
Causes redness, swelling, warmth, and skin thickening
Often does not form a lump
Requires urgent medical attention
Paget’s Disease of the Breast
A rare cancer involving the nipple and areola
Symptoms may resemble eczema or rash
Often associated with underlying DCIS or invasive cancer
Breast Cancer in Men
While rare, men can develop most of the same types of breast cancer as women. The most common type of breast cancer in men is invasive ductal carcinoma. Symptoms include a lump, nipple changes, or discharge
Why the Type of Breast Cancer Matters
Knowing the type of breast cancer helps doctors determine:
The best treatment options
Whether hormone therapy or targeted therapy will be effective
The expected course and outlook of the disease
A Closing Message
Breast cancer is highly individual.
Advances in screening and treatment mean that many types—especially when found early—are very treatable.
This site is registered on wpml.org as a development site. Switch to a production site key to remove this banner.
