Melodi Matrix™ in Breast Reconstruction

Inclusion Criteria: * Female. * Age 22 or older at the time of enrollment. * Is scheduled to undergo unilateral or bilateral mastectomy (including prophylactic) with immediate two-stage post-mastectomy alloplastic prepectoral breast reconstruction. * Is able to and willing to comply with the study requirements and providing informed consent. Exclusion Criteria: * Has prior history of neoadjuvant radiotherapy. * Has had prior history of failed tissue expansion or breast implantation at the intended reconstruction site. * Has an active abscess or infection requiring antibiotics anywhere in their body within 30 days. * Has a Body Mass Index (BMI) \< 14 or \> 40. * Is pregnant or is nursing; or plans to become pregnant during the course of the study. * Has any connective tissue/autoimmune disorder or rheumatoid disease. * Has known allergies to study device materials. * Is participating in another interventional research study that may interfere with study endpoints. * Has limited life expectancy or co-morbid conditions, social/psychological problems, or cognitive impairments that precludes participation. * Has a medical condition or is taking medications that would result in elevated risk and/or affect the validity of the study. * Intraoperative assessment demonstrates unfavorable conditions (i.e., poor mastectomy skin flap thickness or viability) for immediate, two-stage post-mastectomy alloplastic prepectoral reconstruction in any breast.