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Dark room being illuminated by light-filled garden, symbolizing hope in platinum-resistant ovarian cancer (PROC)

Shining a light on platinum-resistant ovarian cancer (PROC)

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What is chemotherapy resistance?

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Chemotherapy resistance occurs when your ovarian cancer progresses after any type of chemotherapy

Over time, your treatment may not work as well as it did before, and your ovarian cancer may get worse (progress) or come back (recur). Chemotherapy resistance is the term used for this whether your chemotherapy treatment was platinum or non-platinum.

Platinum resistance is when your cancer doesn't respond well to or recurs after platinum-based chemotherapy

Therefore, platinum-resistant ovarian cancer is the term used when the cancer progresses or recurs within 6 months of treatment with a platinum-based chemotherapy.

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Why does chemotherapy treatment stop working?

Scientists believe that cortisol may play a role in how tumors respond to certain chemotherapy agents in ovarian cancer

Cortisol, known as “the stress hormone,” is a natural hormone in the body and is responsible for different things, like regulating your metabolism and managing how your body responds to stress.

Cortisol activity may also affect how well certain chemotherapy agents work in ovarian cancer cells.

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Cortisol binds to a molecule called the glucocorticoid receptor.

Easing the burden

Cortisol attaches to the glucocorticoid receptor like a key in a lock. In ovarian cancer cells, this turns on a series of signals which can cause certain chemotherapy treatments to become less effective. This can happen even with normal levels of cortisol in the body.

Easing the burden

Understanding how cortisol and the glucocorticoid receptor interact with ovarian cancer may help oncologists understand why some chemotherapies may not work for women with platinum-resistant ovarian cancer.Ovarian cancer and the results of your treatment are complex. Chemotherapy resistance is not your fault, and you have a care team to help explore your options moving forward.

Easing the burden
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What happens after chemotherapy resistance?

The conversation does not end with resistance

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Your oncologist and care team will work with you to determine the way forward for you

There are several ways your oncologist can respond to chemotherapy resistance, including switching your therapy. Some of today’s options in platinum-resistant ovarian cancer require testing for a biomarker—a gene or a protein in your cancer cells—that indicates the treatment may work.While biomarkers provide an additional treatment opportunity for eligible women, researchers are looking to expand opportunities for all women.

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Staying positive at this stage can be hard, but the support of your care team and loved ones can make a meaningful difference

In addition to your medical care team, loved ones and caregivers, community ovarian cancer groups, and even your own mindset will play a huge role in advocating for and supporting you.

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Illuminate Recurrence Brochure

Get a guide to understanding and living with recurrence in ovarian cancer.

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Platinum-Resistant Ovarian Cancer Quick Guide

Get a quick refresher on what platinum-resistant ovarian cancer means and the role cortisol may play.

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Care Team Discussion Guide

It’s important to remember that your voice has value and there is power in advocating for yourself.Explore this guide when speaking with your doctor about managing chemotherapy resistance.

Managing PROC icon
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Managing platinum-resistant ovarian cancer takes strength and perseverance

Treatment options may be different for everyone based on biomarkers, treatment history, or other factors.

The information provided on this website is not a substitute for medical advice and is intended for educational purposes and for US audiences only. Talk with a healthcare professional if you have concerns about your health. This website is funded and maintained by Corcept Therapeutics.
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Copyright © 2025 Corcept Therapeutics Incorporated. All rights reserved. REL-N-00020 JUN 2025 ONC
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