Yes, chemotherapy isn't usually given after surgery because borderline ovarian tumours don't tend to come back.

These tumours are made up of low grade cells. This means when they're examined under a microscope they look very like normal ovarian cells. They grow very slowly and are much less likely to spread. Most borderline ovarian tumours are found at a very early stage and haven't spread beyond the ovary. And so they're usually cured with surgery alone.

In young women who haven't had children it's not unusual to remove only the affected ovary and its fallopian tube. This is so that you can still try to have children, if you choose. But in women who've completed their family or had their menopause doctors often advise an operation to remove both ovaries and the womb.

Reference

• Cadron I et al 2006 The management of borderline tumours of the ovary. Current Opinion in Oncology 2006 18(5) 488-493