Topotecan in combination with carboplatin: phase I trial evaluation of two treatment schedules. - Simpson AB; Calvert PM; Sludden JA; Boddy AV; Griffin MJ; Schätzlein A; Wilson P; Fishwick K; Wheatley A; Ross GA; Calvert AH; Twelves CJ (Annals of oncology : official journal of the European Society for Medical Oncology, 2002)