It's more than 12 weeks post-surgery for stage 3 ovarian cancer. is it too late to benefit from chemotherapy?

Unknown: Most oncologists prefer to treat patients with a malignancy like ovarian cancer within 12 weeks from their diagnosis. At 12 weeks post surgery you are right on the edge. However, i think most oncologists would want to treat you because of the nature of ovarian cancer. You should have restaging studies with a ct scan as well. Definitely ask your oncologist, as there are many variable here.

No: Depending on the extent of the surgical outcome and your health status, chemotherapy will be recommended. Discuss this with your gyn oncologist or medical oncologist. http://www.cancer.gov/cancertopics/pdq/treatment/ovarianepithelial/healthprofessional/page5.

Ovarian cancer: Unfortunately, yes. By this time the disease that was removed has recurred. In general with ovarian cancer, we try and treat within 4 weeks of surgery.