Tumor-targeted gene delivery of tumor necrosis factor-α induces tumor necrosis and tumor regression without systemic toxicity. - Kircheis, Ralf; Ostermann, Elinborg; Wolschek, Markus F; Lichtenberger, Cornelia; Magin-Lachmann, Christine; Wightman, Lionel; Kursa, Malgorzata; Wagner, Ernst (Cancer Gene Therapy, 2002)