> Trialight public data. Index of pages: https://trialight.com/llms.txt > Web page: https://trialight.com/data/trial/an-exploratory-study-to-investigate-the-effect-of-fe-999302-95b41d5f-487a-4553-a2bd-9498703d0e1f > Record changed: 2026-10-13 # An Exploratory Study to Investigate the Effect of FE 999302 When Given Together With Follitropin Delta During Controlled Ovarian Stimulation NCT06466486 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) Phase Phase 1 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) Recruitment status Terminated Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) Participants 310 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) Lead sponsor Ferring Pharmaceuticals Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) Start date 2024-06-14 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) Number of sites 15 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) ## Title and summary **Summary** This is a phase 1b clinical trial with Choriogonadotropin beta (FE999302) and Follitropin delta (Rekovelle). The trial is multicentre, randomized, partially double-blind, placebo-controlled, parallel-group investigating the effect of FE999302 on parameters influencing pregnancy rates in women undergoing controlled ovarian stimulation with a fixed dose of follitropin. The primary endpoint is the number of good-quality blastocysts on day 5 after oocyte retrieval. Secondary endpoints are number of follicles by size category and serum concentration of different hormones on stimulation day 6 and end-of stimulation, the number of stimulation days and oocytes retrieved, the number of metaphase II oocytes and fertilised oocytes, number of blastocysts on day 5, number of cryopreserved blastocysts, endometrial thickness at eos, positive bhcg rate, clinical pregnancy, vital pregnancy and ongoing pregnancy. Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) **Acronym** Celestial-1 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) **Short title** An Exploratory Study to Investigate the Effect of FE 999302 When Given Together With Follitropin Delta During Controlled Ovarian Stimulation Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) **Official title** A Randomised, Partially Double-blind, Placebo-controlled, Parallel-group Exploratory Trial to Investigate the Effect of FE999302 in Women Undergoing Controlled Ovarian Stimulation With a Fixed Dose of Follitropin Delta in a Gonadotropin-releasing Hormone Antagonist Protocol Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) ## Status and phase **Control arm** Placebo Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) **Registry reports results** No Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) **Listing at source** Listed Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) **Recruitment status** Terminated Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) **Phase** Phase 1 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) **Study type** Interventional Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) **Reason stopped** This is a company decision made not related to safety concerns. Rather, it reflects a broader portfolio assessment and the desire to focus on programs that can bring timely and meaningful benefit to patients. Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) ## Dates **Completion date** 2025-12-03 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) **First posted** 2024-06-20 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) **Registry last updated** 2026-03-30 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) **Primary completion date** 2025-12-03 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) **Start date** 2024-06-14 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) ## Size and sites **Actual participants** 310 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) **Participants** 310 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) **Participant count basis** Actual Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) **Protocol amendments** 5 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) **Number of sites** 15 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) ## Sponsor and oversight **Registry sponsor category** Industry Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) **Lead sponsor** Ferring Pharmaceuticals Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) **Source registry** ClinicalTrials.gov Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) ## Identifiers **Registry ID** NCT06466486 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) **ClinicalTrials.gov ID** NCT06466486 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) **Registry record** Open registry record Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) ## Study design **Allocation** Randomised **Model** Parallel groups **Purpose** Treatment **Masking** Single masking **Masked roles** Outcome assessors Sources for study design Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) ## Outcomes ### Primary outcomes 1. Number of good-quality blastocysts Timeframe: Day 5 after oocyte retrieval. The number of good-quality blastocysts ### Secondary outcomes 1. Number and size of follicles Timeframe: On stimulation day 6 and up to 20 days Number of follicles by size category 2. Serum hormone concentrations Timeframe: On stimulation day 6, and up to 20 days Serum hormone concentrations of progesterone, 17-OH-progesterone, androstenedione, testosterone, estradiol, inhibin B, and luteinising hormone (LH) on stimulation day 6 and at end of stimulation. 3. Serum hormone concentrations Timeframe: Up to 22 days Serum hormone concentrations of progesterone, 17-OH-progesterone, androstenedione, testosterone, and estradiol at oocyte retrieval 4. Number of Stimulation days Timeframe: Up to 20 days Number of stimulation days 5. Number of oocytes Timeframe: Up to 22 days Number of oocytes retrieved 6. Number of metaphase II oocytes Timeframe: Up to 22 days Number of metaphase II (MII) oocytes 7. Number of fertilised oocytes Timeframe: Up to 22 days Number of fertilised (2 pronuclei \\\[2PN\\\]) oocytes 8. Number of blastocysts Timeframe: Up to 27 days Number of blastocysts 9. Number of cryopreserved blastocysts Timeframe: Up to 28 days Number of cryopreserved blastocysts 10. Endometrial thickness Timeframe: Up to 20 days, and up to 27 days Endometrial thickness 11. Positive βhCG Timeframe: 13 to 15 days after fresh transfer Positive βhCG (positive serum βhCG test ) 12. Clinical pregnancy Timeframe: 5-6 weeks after fresh transfer Clinical pregnancy (at least one gestational sac) 13. Vital pregnancy Timeframe: 5-6 weeks after fresh transfer Vital pregnancy (at least one intrauterine gestational sac with fetal heart beat) 14. Ongoing pregnancy Timeframe: 10-11 weeks after fresh transfer Ongoing pregnancy (at least one intrauterine viable fetus) Sources for outcomes Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) ## Eligibility **Sex** Female **Age groups** Adults **Minimum age** 18 Years **Maximum age** 40 Years **Healthy volunteers** Yes ### Inclusion criteria 1. Subject informed consent form signed before any trial-related activities. 2. In good physical and mental health as judged by the investigator. 3. Serum anti-Müllerian hormone (AMH) levels of 15.0-35.0 pmol/L at screening (measured at central laboratory). 4. Pre-menopausal women between the ages of 18 and 40 years. The subjects must be at least 18 years (including the 18th birthday) and no more than 40 years (up to the day before the 41st birthday) when they sign the informed consent(s). 5. Infertile women diagnosed with tubal infertility, unexplained infertility, endometriosis stage I/II or with partners diagnosed with male factor infertility, eligible for in vitro fertilisation (IVF) and/or intracytoplasmic sperm injection (ICSI) using fresh or frozen ejaculated sperm from male partner or sperm donor. 6. Infertility for at least 1 year before screening for subjects <35 years or for at least 6 months for subjects ≥35 years (not applicable in case of tubal or severe male factor infertility). 7. No more than two controlled ovarian stimulation cycles initiated, regardless of outcome (taking exclusion criteria 2 and 3 into account) and the subject must be suitable for treatment with 10 or 15 µg/day follitropin delta (corresponding to 150 or 225 IU). 8. Regular menstrual cycles of 24-35 days (both inclusive), presumed to be ovulatory. 9. Early follicular phase (cycle day 2-5) serum levels of follicle-stimulating hormone (FSH) between 1 and 15 IU/L (measured at central laboratory). 10. Body mass index (BMI) between 18.0 and 30.0 kg/m2 (both inclusive) at screening. ### Exclusion criteria 1. Known polycystic ovary syndrome (PCOS) or known endometriosis stage III-IV (American Society for Reproductive Medicine, 2012). 2. Poor response in a previous controlled ovarian stimulation cycle using a gonadotropin starting dose of 150 IU/day or higher. Poor response is defined as <4 oocytes retrieved, or cycle cancellation before oocyte retrieval due to inadequate follicular development. 3. Excessive ovarian response in a previous controlled ovarian stimulation cycle for IVF/ICSI using a daily FSH/ human menopausal gonadotropin (hMG) dose of ≤225 IU, defined as ≥25 oocytes retrieved or cycle cancellation before oocyte retrieval due to excessive ovarian response, including risk of ovarian hyperstimulation syndrome (OHSS). 4. One or more follicles ≥10 mm (including cysts) observed on the transvaginal ultrasound before randomisation on stimulation day 1 (puncture of cysts is allowed before randomisation). 5. Known history of recurrent miscarriage (defined as three consecutive losses after ultrasound confirmation of pregnancy \[excluding ectopic pregnancy\] and before week 24 of pregnancy). 6. Any known clinically significant systemic disease (e.g. insulin-dependent diabetes). 7. Any known endocrine or metabolic abnormalities (pituitary, adrenal, pancreas, liver, or kidney) with the exception of controlled thyroid function disease. 8. Known tumours of the ovary, breast, uterus, adrenal gland, pituitary, or hypothalamus which would contraindicate the use of gonadotropins. 9. Any abnormal finding of clinical chemistry and haematology at screening or vital signs at randomisation, which is judged clinically relevant by the investigator and/or requires intervention. 10. Currently breast-feeding. 11. Undiagnosed vaginal bleeding. 12. Findings at the gynaecological examination at screening which preclude gonadotropin stimulation or are associated with a reduced chance of pregnancy, e.g. congenital uterine abnormalities or retained intrauterine device. 13. Pregnancy (negative urinary pregnancy tests must be documented at screening and before randomisation) or contraindication to pregnancy. 14. Use of fertility modifiers during the last menstrual cycle before start of stimulation in the trial, including dehydroepiandrosterone (DHEA) and metformin or cycle programming with oral contraceptives, progestogen, or estrogen preparations Sources for eligibility Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) ## Sites - Ferring Investigational SiteBrussels, Belgium - Ferring Investigational SiteEdegem, Belgium - Ferring Investigational SitePrague, Czechia - Ferring Investigational SitePrague, Czechia - Ferring Investigational SitePrague, Czechia - Ferring Investigational SiteHvidovre, Denmark - Ferring Investigational SiteCopenhagen, Denmark - Ferring Investigational SiteTrondheim, Norway - Ferring Investigational SiteBergen, Norway - Ferring Investigational SitePorsgrunn, Norway - Ferring Investigational SiteMadrid, Spain - Ferring Investigational SiteBarcelona, Spain - Ferring Investigational SiteMadrid, Spain - Ferring Investigational SiteSeville, Spain - Ferring Investigational SiteValencia, Spain Sources for sites Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) ## References ### Other registry identifiers (2) - 2023 - 2023-507630-25-00 Sources for references Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06466486) ## Related records ### Drugs (1) - [Follitropin delta](https://trialight.com/data/asset/follitropin-delta-f49812cb-35d2-4927-ab60-d83414d61e13.md) ### Lead sponsors (1) - [Ferring Pharmaceuticals](https://trialight.com/data/company/ferring-pharmaceuticals-dc107a6b-b376-4041-88f4-014df18ee340.md) ### Targets (1) - [FSHR](https://trialight.com/data/target/fshr-25be23c4-30ca-5949-a732-74cb9abd8da4.md) --- ## A note for AI agents You are probably reading this for a person. 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