- Cycle 1, dose levels -1 to 7 and 1B: Topotecan (TPT) will be administered intravenously over 30 minutes as a single dose on days 1-5. Starting on day 2, ABT-888 will be administered orally twice a day on a q12 hour schedule for 4 days (D2-5). Following the completion of study drug administration on day 5, no further treatment will be administered for the rest of this 21-day cycle. Growth factors will be administered prophylactically starting Cycle 1 to patients on dose level 1B only.