- International normalized ratio (INR)/partial thromboplastin time (PTT) =< 1.5 x ULN; Note-subjects who are therapeutically treated with an agent such as warfarin or heparin will be allowed to participate provided that their medication dose and INR/PTT are stable; close monitoring (day 1 of each cycle) is mandatory; if either of these values is above the therapeutic range, the doses should be modified and the assessments should be repeated weekly until they are stable