# Cosmetic Habits Associated With Breast Cancer in Benin: A Multicenter Case–Control Study

## TL;DR

The study finds that using certain cosmetics is linked to higher breast cancer risk in Benin, suggesting a need for better regulation and awareness.

## Contribution

The study identifies specific cosmetic products as risk factors for breast cancer in Benin, a novel insight in this region.

## Key findings

- Use of scented lotions, perfumes, and shampoos significantly increases breast cancer risk.
- Consumption of soy, beans, and sesame is unexpectedly linked to higher breast cancer risk.
- A family history of breast cancer triples the risk of developing it.

## Abstract

Breast cancer remains the leading cause of cancer‐related death among women worldwide. An increasing number of studies highlight the contribution of environmental and lifestyle factors, including cosmetic use, in its development.

To assess the association between cosmetic and dietary habits and breast cancer risk among women in Benin.

A case–control study was conducted involving 100 women diagnosed with breast cancer and matched 200 controls in the departments of visceral surgery, internal medicine, dermatology‐venereology, and rheumatology at CNHU‐HKM, and the gynecology‐obstetrics department of CHU‐MEL. Data were collected using a standardized questionnaire addressing family history, dietary patterns, and cosmetic product usage.

In multivariate analysis, several cosmetic practices including the use of alkaline soaps (ORa = 7.26; p = 0.001), scented body lotions (ORa = 25.90; p < 0.001), perfumes (ORa = 30.43; p < 0.01), deodorants (ORa = 5.76; p = 0.009), shampoos/conditioners (ORa = 31.92; p < 0.001), and lipsticks (ORa = 69.12; p = 0.018) were significantly associated with increased breast cancer risk. First‐degree family history of breast cancer was associated with more than a threefold increase in risk. Contrary to existing literature, the consumption of soy, beans, and sesame also appeared to be linked to a higher risk of breast cancer in this population.

Our results show a possible association between environmental factors—particularly the use of cosmetic products—and breast cancer. These results underscore a compelling need for a national cosmetovigilance system in Benin and public health initiatives promoting healthier lifestyles, especially among genetically predisposed women.