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Promising Results for Ribociclib and Letrozole Combination in Recurrent Low-Grade Serous Ovarian Cancer



Trial Results Presentation

Mar 25, 2023 | SF STAT!

Brian Slomovitz, MD, Professor of Obstetrics/Gynecology and Division Director at Mount Sinai  Medical Center presents trial results at The Society of Gynecologic Oncology’s 2023 Annual Meeting on Women’s Cancer in Tampa, Florida.

Clinical Trial Outcomes

MIAMI BEACH, FL, March 25, 2023 — Mount Sinai Medical Center (MSMC) is pleased to announce the results of a clinical trial led by Brian Slomovitz, MD, Professor of Obstetrics/Gynecology and Division Director at Mount Sinai Medical Center in Miami Beach, Florida. The investigator-initiated phase II trial, sponsored by the GOG Foundation, investigated the combination of ribociclib and letrozole in patients with recurrent low-grade serous ovarian cancer (LGSOC) (GOG-3026) presenting positive results that will change the standard of care for this cancer moving forward. As the Principal Investigator for this trial, Dr. Slomovitz presented the results at The Society of Gynecologic Oncology’s 2023 Annual Meeting on Women’s Cancer ™ in Tampa, Florida.

In this trial, the reported response rate was 23%, the progression-free survival 19.1 months, and the duration of response of 19.1 months. Sixty-four percent of evaluable patients experienced a reduction in target tumor size.

About Low-Grade Serous Ovarian Cancer

LGSOC is a rare subtype of ovarian cancer, which typically occurs in younger women and may arise from a non-invasive precursor disease (serous borderline tumor). Approximately 80% of women with LGSOC suffer disease recurrence following primary therapy. Traditional treatment options, including chemotherapy, hormonal therapy, and biologic targeted therapies, have limited clinical efficacy and short durations of response.  In particular, response rates to chemotherapy range from 0-15%. Treatment options for women with recurrent disease remains an unmet need.

Next Steps

Dr. Slomovitz added, “Our next steps are to compare this regimen of ribociclib and letrozole vs the best current therapies in a head-to-head study. Hopefully this work can lead to an FDA approval for this combination.”

Mount Sinai Medical Center

Mount Sinai Medical Center is excited about this promising advancement for gynecologic cancer patients dealing with rare tumors. This is yet another opportunity to help transform the standard of care in gynecologic oncology.

Founded in 1949, Mount Sinai Medical Center is the largest independent, private, not-for-profit teaching hospital in South Florida. Mount Sinai’s mission is to provide quality health care to a diverse community enhanced through teaching, research, charity care and financial responsibility. Mount Sinai’s Centers of Excellence combine technology, research, and academics to provide innovative and comprehensive care in cardiology, neuroscience, oncology, urology, and orthopedics. One of the original statutory teaching hospitals in the state of Florida, Mount Sinai is the hospital of choice for those who seek the level of expertise and care that only a teaching hospital can offer. Mount Sinai currently offers nine convenient locations in Miami-Dade County, including three emergency centers, and two specialty care offices and a primary care office in Monroe County. For more information on Mount Sinai Medical Center, visit or call 305.674.CARE (2273).

About GOG Foundation

The GOG Foundation, Inc. is a not-for-profit organization with the purpose of promoting excellence in the quality and integrity of clinical and translational scientific research in the field of gynecologic malignancies. The GOG Foundation is committed to maintaining the highest standards in clinical trials development, execution, analysis, and distribution of results.  The GOG Foundation is the only clinical trialist group in the United States that focuses its research on patients with pelvic malignancies, such as cancer of the ovary (including surface peritoneal malignancies), uterus (including endometrium, soft tissue sarcoma, and gestational trophoblastic neoplasia), cervix, and vulva. The GOG Foundation is multi-disciplinary in its approach to clinical trials, and includes gynecologic oncologists, medical oncologists, pathologists, radiation oncologists, oncology nurses, biostatisticians (including those with expertise in bioinformatics), basic scientists, quality of life experts, data managers, and administrative personnel.

GOG Partners Program

Supported by industry, GOG Partners program is structured to work directly with pharmaceutical organizations and operate clinical trials outside the National Cancer Institute (NCI) framework. The GOG Partners program promotes the mission of the GOG Foundation dedicated to transforming the care in Gynecologic Oncology.  By providing an alternative venue for patient accrual and site infrastructure support, GOG Partners has helped provide additional trials and opportunities for patients outside the national gynecologic clinical trials network.

About Ovarian Cancer

Ovarian cancer is the eighth leading cause of cancer-related death among women worldwide. LGSOC make up 5-10% of all serous carcinomas of the ovary. They tend to occur in younger women than high grade serous cancers. 80% of the women who are diagnosed have stage III disease. Current treatment options include surgery, chemotherapy, hormonal therapy, and biomarker driven therapies. Better treatment options clearly represent an unmet need.

Investigator Initiated Trial Studies

In support of our dedication to transforming the standard of care in gynecologic oncology, the GOG Foundation, Inc. sponsors Investigator Initiated Trial (IIT) studies with scientific merit.  In some instances, through sponsorship and in collaboration with individuals or companies, the GOG will work collaboratively with these entities that provide partial support, drugs or technology. These trials are designed to have a direct impact on patients by assessing cost-effective treatments and generating data applicable to the local population at both academic and community-based sites through the GOG Partners Program. The GOG physician leadership provides mentorship for the next generation of investigators leading these IITs.  The GOG has a committee that periodically reviews and evaluates applications during a request for proposals process.    More details on how to apply can be found at




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