Fortuitous Eradication of an Aggressive Basal Cell Carcinoma Via Foreign Body Reaction to a Polyurethane Vacuum-Assisted Closure Sponge.

The foreign body reaction (FBR) is a well-documented immune reaction. Much of the literature on FBRs has focused on minimizing this immune response to mitigate the impact on medical implants. Here, we present a case that illustrates a serendipitous oncologic outcome from an FBR. A 54-year-old man presented with an aggressive basal cell carcinoma (BCC). At the first resection, he had broadly positive surgical margins. The surgical wound was temporized with a polyurethane wound vacuum assisted closure (VAC) device. He was lost to follow-up having retained a VAC sponge for a total of 12 weeks. A wide re-resection was performed 7 months after the initial resection. Exhaustive examination of the resected specimen was performed. There was an absence of any BCC, replaced by a widespread chronic FBR to polyurethane VAC sponge particles. This suggests that the foreign body immune response was sufficiently intense to eradicate any remaining BCC. This case illustrates the concept of an FBR as a novel method of local immunotherapy.