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Adult Granulosa Cell Tumor of the Ovary: Initial Evaluation and Current Treatment Paradigm

Author(s): Melissa Hodeib, Ilene Tsui, Abed Sinno, Nisha Bansal and Joshua G. Cohen

Article Information

Melissa Hodeib1, Ilene Tsui1, Abed Sinno1,2, Nisha Bansal1 and Joshua G. Cohen1*

1Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, University of California Los Angeles, Los Angeles, CA, USA
2Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, Olive View-UCLA Medical Center, Sylmar, CA, USA

*Corresponding Author: Joshua G. Cohen, Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, University of California Los Angeles, Los Angeles, CA 90095, USA, Tel: (310) 794-9098; Fax: (310) 794-9110;

Received: 27 October 2017; Accepted: 24 November 2017; Published: 04 December 2017


Adult granulosa cell tumor (AGCT) is a sex cord stromal tumor (SCST) which constitutes 2-5% of all ovarian cancers. Initial treatment of early stage disease includes primary surgical resection with or without adjuvant treatment. Late stage disease and recurrent disease management involves multimodality treatment with surgical resection as the mainstay. Given the rarity of this tumor and its relative chemoresistance, future study is needed to better guide adjuvant treatment and individualize therapy for patients. Further evaluation of diagnostic and potential therapeutic implications involving FOXL2 mutations in AGCT is warranted.


Adult granulosa cell tumor, Fertility preservation, Sex cord stromal tumor, Ovarian cancer

Article Details

1. Epidemiology/Prognostic Factors

Adult granulosa cell tumor (AGCT) is a sex cord stromal tumor (SCST) which constitutes 2-5% of all ovarian cancers and approximately 70% of malignant SCSTs [1]. Despite late recurrences occurring up to 37 years after initial diagnosis, patients typically have a good prognosis since tumors tend to follow an indolent course [2]. Most AGCTs present at an earlier stage compared to epithelial tumors, often with signs of estrogen excess as they express aromatase activity and promote estrogen synthesis [3]. Symptoms include virilization, abnormal uterine bleeding, abdominal distention or pain due to the tumor size, and ascites in 1-2% of the cases [4, 5].

Given the rarity of this tumor risk factors for the disease have not yet been well elucidated. In the past, it was thought fertility promoting agents and oral contraceptive use may increase the risk of development of AGCTs however this has not been proven to be the case [6]. AGCTs also characteristically produce inhibin, estradiol, anti-mullerian hormone (AMH), and express receptors for follicle stimulating hormone (FSH) and luteinizing hormone (LH) [3].

Non-tumoral risk factors include obesity, non-white race, and diabetes [7], which may predispose patients to AGCT and recurrence [7] (Table 1). In one patient population, on multivariate analysis diabetes mellitus was the strongest predictor of recurrent disease with a hazard ratio (HR) of 3.58 and confidence interval (CI) of 1.10-9.03 [7]. Counseling and treatment of diabetes mellitus has therefore been a complementary approach to disease prevention and AGCT recurrence risk (RR) modification.

Significant non-modifiable prognostic factors for recurrence include stage at diagnosis, tumor size, and mitotic index greater than four [8, 9] (Table 1). Stage is considered the most important prognostic factor; patients with stage II disease have a greater than 7-fold increased risk for recurrence than patients with stage IA disease [8]. Mitotic index greater than 4 confers a 4.9x greater hazard for recurrence [8]. Residual disease after initial surgery [7, 10, 11] and residual disease after secondary debulking significantly affect overall survival (OS) [12].

Risk Factors*

Prognostic Factors+

Diabetes Mellitus

Stage at diagnosis


Optimal tumor debulking

Non-white race

Tumor size (>5 cm)

Mitotic index (>4)

*Oral contraceptives and fertility drugs have not been associated with greater risk of AGCT and there has been no known inherited predisposition that increases risk; +Unkila-Kallio, et al (1998); +Suri, et al (2013); +Thomakos, et al (2016).

Table 1: Adult Granulosa Cell Tumors.

2. Molecular Biology/Genetics/Pathology

More than 95% of ovarian AGCTs harbor a 402C>G missense somatic point mutation in the transcription factor FOXL2 gene which codes for granulosa cell differentiation and maintenance of ovarian function. This mutation causes a partial loss of apoptotic function in AGCT-derived cells [13]. In fact, the 402C>G mutation may reduce expression of GnRH receptors, making cells resistant to GnRH-induced apoptosis [14]. There has been some interaction studied between FOXL2, SMAD3 and GATA4 in regulating CCND2, which plays a role in cell cycle progression and granulosa cell proliferation [13].

Recent evaluation of tumors has identified molecular differences between early and late stage disease [15], which suggests the need for different therapeutic targets in managing these two molecularly unique clinicopathologic stages. A transcriptome analysis of AGCT cells with a positive FOXL2 mutation identified 24 genes whose expression differs significantly between stage 1 and stage 3 disease [15]. The impact of differing molecular signatures in early versus late stage disease remains to be determined. Future characterization is needed to determine if molecular signatures lead to better prediction of tumor response and further therapeutic intervention.

AGCTs are often large (10-15cm in diameter) and multicystic [16]. They can have an edematous exterior, causing them to be adherent to other pelvic organs [16]. Within the interior, these tumors are comprised of solid components mixed with hemorrhagic and necrotic or cystic areas that are filled with serosanguinous fluid [17]. Microscopically, they are composed predominantly of granulosa cells with coffee bean nuclei and Call-Exner bodies, a rosette arrangement of cells around eosinophilic fluid space [16]. Cells are crowded and contain scant, pale cytoplasm [16].

3. Evaluation

Upon the initial presentation of a patient with suspected AGCT, evaluation should include imaging with a pelvic ultrasound, a computer tomography (CT) scan of the abdomen and pelvis, and tumor marker levels, including inhibin A, inhibin B, and possibly mullerian inhibiting substance (MIS) [19, 20, 21] (Figure 1). Magnetic resonance imaging (MRI) of the abdomen and pelvis is another option for preoperative imaging. If final pathology confirms cancer, imaging of the chest with CT, MRI, or chest x-ray to evaluate for metastatic disease is reasonable.

Inhibin, a peptide hormone produced by granulosa cells in response to follicle stimulating hormone (FSH), can be inappropriately elevated in women with ovarian granulosa cell tumors [22]. Studies have shown an inappropriate rise 5-20 months before a clinical recurrence suggesting its utility as a marker for early detection of disease [22]. Anti-mullerian hormone (AMH), like inhibin, is also produced by granulosa cells and typically undetectable in post-menopausal women. An elevated AMH level is highly specific for granulosa cell tumors and can become elevated 11 months before a recurrence [19]. A recent study has shown that AGCT recurrence may be detected non-invasively from circulating plasma cell free DNA in patients with clinical disease via a liquid biopsy for the FOXL2 mutation [23]. This may have particular efficacy if tumor biopsy samples cannot otherwise be obtained. Results suggest that the mutation can be detected prior to elevation of serum markers and clinical symptoms [23]. Further testing of this technology is needed before this becomes routine.

An endometrial biopsy is another component in the initial evaluation for AGCT due to the prolonged exposure of the endometrium to high levels of estradiol produced by granulosa cells. The incidence of endometrial hyperplasia ranges from 21-60% and endometrial carcinoma, from 1.3-12.8%, with almost all of these women being older than 45 years of age [24-27]. A preoperative endometrial biopsy is especially important in women who desire fertility preservation in order to appropriately manage their risk of cancer.

3. Treatment of Early Stage Disease

Surgery has been the mainstay of treatment for AGCTs with the goal of achieving no gross residual disease [28]. Residual disease at the time of completion surgery is associated with poor prognosis and recurrence [9-11].

Complete surgical resection and limited staging include a total abdominal hysterectomy (TAH), bilateral salpingo-oophorectomy (BSO), exploration of the peritoneal cavity, omentectomy, peritoneal biopsies and washings. Nodal dissection is of limited value and typically not recommended, especially in suspected early stage 1A disease, as sex cord stromal tumors have a very low incidence of lymph node metastasis [29]. A recent study performed by Wilson et al further validated the importance of upfront surgical resection with optimal cytoreduction followed by adjuvant therapy if indicated [26]. This study reported patients who received neoadjuvant chemotherapy had a median recurrence almost two times earlier than those who underwent upfront surgical resection [26]. For young premenopausal patients desiring fertility sparing surgery, a unilateral salpingo-oophorectomy (USO) is feasible if disease is confined to one ovary (stage 1A) [27, 28]. Pelvic washings, omental sampling, and peritoneal biopsies are recommended as part of evaluation for metastatic disease. An endometrial biopsy is recommended to rule out concomitant endometrial cancer (Figure 1).


* Schumer et al (2003); * NCCN - Ovarian Cancer (2017).
Figure 1: Adult Granulosa Cell Tumor.

The efficacy of adjuvant chemotherapy in the setting of AGCT remains unclear for several reasons. Indications for use include an unresectable tumor at initial diagnosis or recurrent tumor, extra ovarian spread (advanced stage) or suboptimal cytoreduction. Consideration for chemotherapy in high risk stage 1 patients is recommended through the National Comprehensive Cancer Network (NCCN), though the definition of a high risk group remains unclear [28]. High risk features may include large tumor size (>10cm), poorly differentiated tumor, high mitotic index, tumor rupture, and stage 1C as these factors are associated with a higher risk of relapse [30]. Additional risk factors that may also warrant adjuvant therapy include obesity, diabetes, and residual disease [7, 26].

Adjuvant chemotherapy was not significantly associated with DFS in early stage AGCT (p=0.193) [29]. A retrospective study of 40 patients with stage IC primary granulosa cell tumor of the ovary recently found no improvement in disease free survival with adjuvant chemotherapy [31]. The relative chemoresistance of this tumor and its predisposition for late recurrence makes the role of chemotherapy in early stage, low risk patients unclear.

There is variability in the cytotoxic treatment regimens for AGCT. The BEP regimen has been the most commonly used and widely studied regimen [32]. Several other regimens have been evaluated including cisplatin, vinblastine, bleomycin [33], cisplatin, doxorubicin, cyclophosphamide [34], taxanes with or without platinum [35]. Given the toxicity associated with chemotherapy, particularly with BEP, use of adjuvant treatment in early stage AGCT should involve a discussion with the patient regarding prognostic factors in the context of treatment toxicity.

4. Treatment of Advanced Stage and Recurrent AGCT

With metastatic or recurrent disease the mainstay of treatment is surgical cytoreduction with the goal to achieve no visible residual disease. In the setting of recurrent disease, a multi-modality approach is recommended. In non-resectable disease, radiation, chemotherapy, and hormonal therapy are reasonable approaches (Figure 1). Most AGCTs recur in the abdominal cavity and complete resection of recurrent tumor offers the best chance for survival [36]. Greater than 80% of recurrent patients can be optimally cytoreduced, though it is frequently technically challenging and can increase morbidity [10, 37]. Either paclitaxel/carboplatin or BEP is preferred for patients with recurrent AGCT of the ovary following complete surgical resection [28, 30].

In a study of 57 patients, 84% of whom had sex cord stromal tumors, only 69% of patients with advanced stage disease and 51% of patients with recurrent disease remained progression free with the BEP regimen [35]. Grade 4 myelotoxicity occurred in 61% of patients and grade 4 gastrointestinal toxicity in 14%. Two bleomycin-related deaths occurred in the first six patients and a dose reduction from 20 units/m ^ 2 weekly for 9 weeks to 20 units/m ^ 2 every three weeks for four in the remaining study population. If BEP is the regimen chosen for use, the bleomycin dose reduction should be used at 20 units/m ^ 2 every three weeks. Pulmonary function tests (PFTs) should be obtained prior to initiation of any treatment which includes bleomycin with low threshold to repeat and compare PFTs during treatment.

In inoperable recurrent disease, a response rate of only 22% was reported with moderate to severe toxicity [38]. A review of fifteen studies that assessed response rates to chemotherapy found in a total of 224 patients with residual or recurrent disease, a measured response rate of 50% was demonstrated (95% CI; 44-57%) [38]. A recent phase two study in patients with malignant stromal tumors evaluated paclitaxel (175mg/m2) over 3 hours as second line therapy [39]. Only one patient (3.2%) had a complete response and 8 patients (25.8%) had a partial response with this regimen [39]. Median PFS in this limited study group was 10.0 months with an OS of 73.6 months. Myelosuppression was also a common side effect, impacting more than a third of participants[39]. Given the small number of complete responses, further study of single agent paclitaxel in the setting of recurrent malignant ovarian stromal tumors with measurable disease was not warranted [39].

Data comparing the efficacy of paclitaxel/carboplatin to standard BEP is still lacking and an ongoing randomized phase 2 trial led by the Gynecological Oncology Group is evaluating this question [40]. One study demonstrated that at 4 years, the OS and event-free survival were 58% and 30% respectively with the BEP. Toxicity included 35% of patients with grade 4 neutropenia, 20% with febrile neutropenia, and 25% with a low bleomycin pulmonary toxicity [41]. Other studies have shown that while there is an overall response to the BEP regimen reported as high as 83%, its effect may be short lived with a mean PFS of only 14 months [42]. The improved toxicity profile associated with paclitaxel/carboplatin compared to BEP make it important to further elucidate if there is a difference in efficacy between these regimens. Prospective clinical trials are needed to further compare the efficacy of carboplatin and paclitaxel vs BEP (Table 2).


Paclitaxel/Carboplatin vs BEP* in advanced or recurrent SCTs

TRC102 and Temozolomide for solid tumors and lymphomas

Orteronel in metastatic or advanced AGCT: The Greko II study

Trial ID

NCT01042522, GOG-0264




Phase II

Phase I

Phase II

Primary outcome


Maximum tolerated dose of TRC102 and temozolomide; response rate of various cancers to this combination

Partial or complete radiological response in patients at six months

Secondary outcome

OS and tumor response rate

Pharmacokinetic profile of TRC102 with temozolomide; PFS

Overall response rate, PFS, OS, reduction in sex hormones and the toxicity profile of orteronel


Inhibin A and B levels as a predictor of response will also be evaluated. Inclusion criteria are chemo-naive patients with histologically diagnosed advanced SCTs within 8 weeks from surgery

TRC102 is a new drug that blocks tumor cells’ ability to repair their DNA and temozolomide specifically damages tumor cell DNA

Orteronel is a selective inhibitor of 17,20 lyase which suppresses sex hormone production

                *BEP = Belomycin Etoposide and Cisplatin; PFS = Progress Free Survival; SCT = sex cord tumors;
OS = overall survival; AGCT = adult granulosa cell tumor; TRC102 = methoxyamine HCl.

Table 2: Ongoing clinical trials.

Chemotherapy in the recurrent setting appears to have clinical benefit (either complete remission, partial remission or stable disease after 6 months) [27, 29, 43, 44]. Other studies evaluating the role of chemotherapy in the recurrent setting have called into question the clinical benefit with recurrent AGCT with some studies suggesting no benefit [9-12]. Limitations of these studies include the small number of enrolled patients, the various stages of disease, and the variation in chemotherapy regimens used.

The role for radiation therapy with residual disease or in the recurrent setting remains unclear. Response rates are variable across the studies as imaging studies were not as precise at the time the original research was conducted [45-51]. With improvement in targeted radiation, further research is warranted in the role of radiation for treatment of oligometastatic disease.

5.  Hormone Therapy/Targeted Therapy/Immunotherapy

The toxicity of BEP or carboplatin/paclitaxel regimens, including pulmonary fibrosis, myelosuppression, and neuropathy, demonstrate the importance of further evaluation of hormonal therapy and targeted agents. Hormonal therapy (HT) is a treatment option for recurrent metastatic or surgically unresectable AGCT [28]. Various agents that have been studied include medroxyprogesterone acetate, megestrol acetate, tamoxifen, aromatase inhibitors and GnRh agonists [28]. Progestins inhibit the production of pituitary gonadotropin, thereby reducing estrogen secretion and interfering with the amount of available estrogen [52]. In one small study, all 22 patients with AGCT were progesterone receptor (PR) positive, suggesting that one additional mechanism for the effectiveness of continuous progesterone is to downregulate receptors on the tumors themselves [53]. GnRH agonists inhibit gonadotropin release, thereby decreasing stimulation of granulosa cells [52]. As most published reports on hormone therapy (HT) are case reports or small studies there are unclear guidelines about patient selection for HT and unclear guidelines for HT regimens. In general, there has been a widely reported range of response to HT in patients with measurable disease: 18% pooled objective response rate (ORR) with a range of 2-34 months PFS to 71% ORR with median PFS of 18 months [28, 54, 55]. The efficacy of HT is further complicated by the wide range of HT combinations showing various results among a limited number of patients who receive HT as an adjunctive therapy. In one small study of 25 patients, only 4 patients who received HT had progressive disease, defined as a greater than 20% increase in the longest lesion diameter [55].

The therapeutic role of aromatase inhibitors (AI) continues to be an area of active study. The proposed mechanism of action is that the FOXL2 missense point binds the aromatase promoter region and increases the activation of aromatase compared to wild type and endogenous estrogen production [56]. Recent data indicates the preservation of the c.402C>G FOXL2 mutation in recurrent AGCTs [57]. Two commonly prescribed AIs for HT are anastrozole (1 mg daily) or letrozole (2.5 mg daily). Switching to a different AI when there is disease progression on the initial AI may provide some clinical benefit [58].

Within the last decade, the development of anti-angiogenic and immunogenic agents may impact the treatment of AGCT. VEGF-A is a mediator of angiogenesis and is intimately involved with tumor growth, migration, and metastasis and is overexpressed in 94% of AGCTs [59]. Bevacizumab, is a monoclonal antibody that blocks angiogenesis by inhibiting vascular endothelial growth factor A (VEGF-A). A recent study by Brown et al. demonstrated that 77.8% of patients achieved stable disease with bevacizumab therapy alone [60]. One study showed that inhibin A and B appear to be markers of bevacizumab therapy response as they were significantly lower post-treatment in patients that did respond to bevacizumab [60]. Further study is needed to determine if inhibin A and B could be used as prognostic markers to select patients for response to anti-VEGF therapy. Additionally, several potential immunotherapeutic targets are now available and warrant further study. Given the presence of FOXL2 upregulation in AGCT, this may represent a potential therapeutic target in vaccines [61].

6. Surveillance

Due to the late recurrence of this disease, long term follow-up is necessary. Monitoring inhibin A and B levels can be helpful in detecting recurrence. A study of 27 patients showed that serum inhibin levels increased to 10 times the upper limit of normal for postmenopausal women with evidence of disease [25]. Other studies have confirmed a 60-fold elevation in median inhibin B concentrations with active disease, reporting that disease usually becomes manifest within one year from marker elevation [62]. Inhibin B had a 89% sensitivity and 100% specificity rate and seemed to more accurately reflect disease status than inhibin A and thus may be the preferred method of follow-up [62]. Both inhibin B and AMH seem to predict earlier recurrence of disease compared to monitoring clinical symptoms and no evidence-based preference for either tumor marker exists [19, 20, 23]. Importantly AMH will not become elevated in epithelial ovarian cancers therefore making it an option to be used for follow up [23].

Imaging should be limited to patients who are symptomatic or have concerning findings on physical exam. Serum tumor markers and a physical exam should be assessed every 2-4 months for the first 2 years followed by every 6 months thereafter [63].

7. Survival

Early stage AGCT has an OS rate of 87 and 76% after 5 and 10 years [65]. In another study of 160 early stage patients, 5 and 10-year OS was 98.5 and 91.6% [26]. In comparison, OS for advanced stage disease is worse with 5-year survival rates between 22-50% [17] and 10-year survival rates for stage III and stage IV at 10% and 0%, respectively [65]. AGCT has been described as a very indolent clinical course well known for late recurrence with recurrence reported even 37 years after initial diagnosis [2].           

More than 70% of women with recurrence die from their disease [17]. Recurrence varies based on median follow-up period; 7% in 9.2 years, 21% in a median time of 57.6 months, 25% in 4-6 years; 32% in 12 years; 43% in 3.2 years [8, 9, 27, 65]. The pelvis is the most common site of recurrence followed by the liver, bowel and retroperitoneum [37]. Overall mortality rates of patients with recurrent AGCT was 30.3% with a median post-recurrent survival of 55.8 months (4.6-193.7 months) [36]. DFS alone contributed to OS in this study; if patients had DFS > 61.5 months, the risk of disease-related death was significantly decreased [36].

8. Conclusion

AGCT is a rare subtype of ovarian cancer, however, this tumor accounts for over 70% of malignant sex cord stromal tumors. Initial treatment of early stage disease includes primary surgical resection followed with or without adjuvant treatment. Fertility preservation is an option for patients with early stage disease. Late stage disease and recurrent disease management involves multimodality treatment with surgical resection as the mainstay followed by chemotherapy, hormonal therapy, or observation. AGCT classically present with late recurrences which can be managed surgically, with chemotherapy, radiation, hormonal therapy, or a combination of these. Given the rarity of this tumor subtype and its relative chemoresistance future research is warranted to better guide our approach and individualize therapy for patients in the post-surgical phase of treatment. Molecular characterization shows promise however no definitive treatment modalities exist at this time based on these studies. Further evaluation of FOXL2 mutations in AGCT and potential therapeutic interventions represents an important future area of study. Enrollment in clinical trials is encouraged when feasible to further elucidate better treatment options for these patients.

9. Acknowledgements

Patients and families impacted by this cancer.

10. Disclosure of Interests

None declared. Completed disclosure of interests form available to view online as supporting information.

11. Contribution To Authorship 

MH and IT performed the initial literature review, MH and JC conceived the ?gure, and MH, IT, AS, NB, and JC participated in the development and revisions of the manuscript.

12. Details of Ethics Approval

Not applicable.

13. Funding

The study was supported solely by departmental funds


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