Breast lumps epidemiology and demographics

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Shadan Mehraban, M.D.[2]

Overview

The incidence rate of breast lumps is not particularly clear due to the fact that breast lumps is not considered as a life threatening condition and majority of the women who receives medical therapies or surgeries come into account.The prevalence of benign breast disease is approximately 68% among all breast diseases and the incidence of breast diseases is higher on the left upper/outer quadrant of breast. Fibrocystic diseases are more frequent in age of 40-44 years and fibroadenoma is more frequent between 15-35 years. Fibroadenoma rate is higher in black women. African-American women have worse prognosis and higher mortality rate in comparison European American women.

Epidemiology and Demographics

Incidence

• The incidence rate of benign breast disease is unclear due to the fact that breast lumps is not considered as a life threatening condition.
• Majority of the women who receives medical therapies or surgeries come into account.
• Particular detection rate is unknown and not estimated.

Prevalence

• The prevalence of benign breast disease is approximately 68% among all breast diseases.
• Approximately 60% of benign breast diseases occur in left breast and 40% in the right breast.
• 100% of definite palpable lumps are characteristics of fibroadenoma, phyllodes tumor, and adenomyoepithelioma.
• 64% of lumps located in upper outer quadrant, 26% of lumps in lower outer quadrant, 10% of lumps in upper inner quadrant.

Age

Age-specific incidence rate of benign breast diseases.

• The incidence rate of fibrocystic disease is 137 per 100,000 in women aged 25-29 years, 411 per 100,000 in age of 40-44 years and 387 per 100,000 in 45-49 years.
• The incidence rate of fibroadenoma is 115 per 100,000 in women aged 20-24 years.
• The peak incidence rate of fibroadenoma is between 15-35 years.
• Fibrocystic disease, phyllodes tumor, and adenomyoepithelioma are usually seen in 3rd and 4th decade of life.

Race

• African American women have worse prognosis and higher mortality rate in comparison to European American women.
• European American women have higher incidence rate of breast cancers.
• The prevalence of fibroadenoma is higher in black women than white individuals.