Krystal Biotech Inc. has received FDA acceptance of its IND application for lead oncology drug candidate KB-707 for the treatment of locally advanced or metastatic solid tumor malignancies. KB-707 is a modified herpes simplex virus 1 (HSV-1) vector designed to deliver genes encoding both human IL-12 and IL-2 to the tumor microenvironment and promote systemic immune-mediated tumor clearance.