Effect of a Mushroom Extract-Containing Topical Cosmetic Formulation During Breast Radiotherapy

This study evaluated a mushroom extract-containing topical cosmetic formulation for skin care in women receiving radiotherapy to the breast after breast-conserving surgery. Participants were randomly assigned to use either the investigational cosmetic formulation or usual moisturizing cosmetic care.

The assigned cosmetic product was applied to intact skin of the breast twice daily, beginning approximately 15 days before radiotherapy, continuing throughout the approximately 3-week radiotherapy period, and ending 1 month after radiotherapy. Participants were instructed not to apply the cosmetic product during the 3 to 4 hours before a radiotherapy session.

Skin condition was assessed before use of the assigned product, at the start and end of radiotherapy, and 1 month after radiotherapy. Assessments included skin hydration, transepidermal water loss, erythema, pigmentation, dermatologic evaluation, photographs, participant-reported product experience, and adverse events. The study compared changes over time between the investigational formulation and usual cosmetic skin care.