Vokes EE, Gordon GS, Rudin CM, Mauer AM, Watson S, Krauss S, Arrieta R, Golomb HM, Hoffman PC. A phase II trial of 9-aminocaptothecin (9-AC) as a 120-h infusion in patients with non-small cell lung cancer. Invest New Drugs. 2001; 19(4):329-33.