- Women of child bearing potential (WOCBP) must have a negative serum (or urine) pregnancy test within 72 hours prior to the first dose of study treatment. Women of childbearing / reproductive potential should use adequate birth control measures, as defined by the investigator, during the study treatment period and for at least 3 months after the last study treatment. Men who are fertile must use effective contraception during treatment with trabectedin and for 5 months thereafter. A highly effective method of birth control is defined as one that results in low failure rate, i.e. less than 1% per year, when used consistently and correctly.