ANX-530 (vinorelbine tartrate injectable emulsion), an investigational drug, is an oil-in-water emulsion of vinorelbine tartrate composed of an oil phase and emulsifier dispersed in an aqueous solution. ADVENTRX Pharmaceuticals, Inc. of San Diego, California, developed ANX-530 as a vinorelbine tartrate formulation to be used in clinical settings where Vinorelbine Tartrate Injection (NAVELBINE) is indicated. Nonclinical toxicology studies suggest either equivalent or less toxicity of ANX-530 compared to Reference Product. In particular, ANX-530 caused less vein toxicity in a rabbit vein irritation model, suggesting ANX-530 could potentially cause less venous irritation than NAVELBINE in a clinical setting. ADVENTRX is investigating whether ANX-530 could substitute for NAVELBINE in these settings.