Squamous cell carcinoma in situ. Photo by Klaus D. Peter via Wikimedia Commons Findings from a preclinical study show a topical cream that blocks the immune-suppressing enzyme LSD1 suppressed tumour growth in two models of cutaneous squamous cell carcinoma (cSCC). The study, published in the  Journal of Clinical Investigation ,  describes how the cream, developed by researchers at the Perelman School of Medicine at the University of Pennsylvania in Philadelphia, prevents LSD1