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Create free account to monitor HALOwe are a clinical-stage biotechnology company focused on developing and commercializing novel cancer therapies that target the tumor microenvironment. our lead proprietary program, investigational drug pegph20, applies a unique approach to targeting solid tumors, potentially providing increased tumor access for co-administered cancer therapies. by breaking down potential barriers to cancer, pegph20 may help make existing treatments more effective by allowing therapies to reach the tumor.