Mepitel Film Breast

Inclusion Criteria: * Age ≥ 21 years old (legal age of maturity in Singapore) * Male or female * Informed consent * Patients have undergone a mastectomy with or without reconstruction or breast-conserving surgery. * Histological confirmation of breast carcinoma (invasive or in situ carcinoma) * Patients are scheduled to receive hypofractionated (40Gy in 15 daily fractions or 26Gy in 5 daily fractions) photon-based RT * Patient treated with or without tissue the addition of equivalent bolus and/or boost. * Can communicate in English or be aided by a translator. Exclusion Criteria: * Prior RT to any portion of the planned treatment site. * Patients will receive partial breast external beam RT, proton beam therapy, or brachytherapy. * Patients with active rash, pre-existing dermatitis, or other conditions within the treatment area may make skin assessment for the study difficult per treating physician discretion. * Known history of adhesive, tape or silicon allergy or sensitivity. * Concomitant cytotoxic chemotherapy * Bilateral breast pathology requiring concurrent bilateral breast or chest wall RT. * Current inflammatory breast cancer or gross dermal involvement at initiation of RT. * Patient has a Karnofsky Performance Status score \<60.