- Patients must be entered and treated within 12 weeks of their most recent surgery performed for the combined purpose of diagnosis, staging and/or cytoreduction; the first cycle of chemotherapy should not be given until at least seven days after the most recent major surgery, which allows 4 weeks to have elapsed prior to the first bevacizumab dose; (placement of venous or peritoneal access devices will be considered minor surgery) (03/29/10)