Why Do Chemotherapy Before Ovarian Cancer Surgery?

It is completely natural to hear “you have cancer” and immediately think, “Get it out of me as soon as possible.” However, for many women with advanced ovarian cancer, doctors recommend starting with chemotherapy before doing surgery. This standard-of-care approach is called neoadjuvant chemotherapy (NACT), followed by an interval debulking surgery.

Instead of rushing into the operating room, your care team uses NACT to shrink the cancer first. Patients typically receive 3 to 4 cycles of chemotherapy, undergo their surgery, and then finish any remaining chemotherapy cycles afterward. During the initial chemotherapy phase, your doctor will closely monitor your progress with blood tests (like CA-125) or scans to ensure the tumors are responding ^[1].

The Goal: Complete Removal (R0)

The single most important factor for long-term survival in ovarian cancer is a surgical outcome called complete cytoreduction (often called R0). This means the surgeon is able to remove all visible cancer from your abdomen ^[2].

When ovarian cancer is advanced, it often spreads like seeds across the lining of the abdomen and onto delicate organs like the liver, diaphragm, or bowels. If a surgeon tries to remove all of it right away (called primary debulking surgery), they might not be able to get it all safely. By giving chemotherapy first, the drugs can shrink the tumors and pull them away from vital organs ^[3]. Large clinical trials have shown that patients who have chemotherapy first are nearly twice as likely to have all visible cancer successfully removed during their later surgery ^[2].

Improved Safety and Easier Recovery

Surgery for advanced ovarian cancer is a major, complex operation. If the cancer is widespread, operating immediately can carry a high risk of severe complications. Research shows that starting with chemotherapy dramatically reduces these risks ^[4].

In a landmark clinical trial, patients who had chemotherapy before surgery had a significantly lower rate of serious post-operative complications (14% compared to 24% for those who had surgery first) ^[5]. The risk of death in the month following surgery also dropped from 6% to less than 1% ^[5]. Additionally, patients who undergo NACT often experience shorter hospital stays and a smoother surgical recovery ^[6].

Survival Rates Are The Same

You might worry that delaying surgery gives the cancer time to grow or reduces your chances of beating it. However, multiple large-scale studies have proven that this is not the case ^[4]. The overall survival rates for women who have chemotherapy first are essentially the same as for women who have surgery first ^[2][5]. You are not losing any survival advantage by waiting for surgery; instead, you are gaining a safer procedure with a higher chance of a complete removal of the tumors ^[3].

How Doctors Make the Decision

Your doctor doesn’t guess which approach is best for you. They use specific tools to map out the cancer before making a recommendation:

• Imaging (CT or MRI scans): To see exactly where the tumors are located and if they are pressing on important blood vessels or organs. This may also be used to safely guide a needle to obtain a small tissue sample (biopsy), which is absolutely required to confirm your exact cancer type before you can start chemotherapy.
• Diagnostic Laparoscopy: A minimally invasive procedure where the surgeon uses a small camera to look inside your abdomen. They often take biopsy samples during this test and use a scoring system (like the Fagotti score) to evaluate how widespread the cancer is ^[7]. If the score is high, it means immediate surgery is unlikely to remove all the cancer safely, making NACT the much better choice ^[8].
• Your Overall Health: If you have other health conditions or are older, a massive upfront surgery might be too hard on your body. Chemotherapy first gives you the best chance at a safer treatment path ^[9].