Don't be afraid to ask questions, and take a written list of questions with you. Some good  questions might  be:

• How many cases of appendix cancer (or peritoneal cancer) have you treated?
• What treatments do you use?
• What are your survival rates?
• What are your complications rates?
• How aggressive is my particular tumor?
• What treatments do you think I will need?
• How long do you expect my recovery from treatment to take

If you want to know some other questions to ask your surgeon, the US Department of Health and Human Services offers a suggested list of questions in a brochure entitled:   Making Sure Your Surgery is Safe