Clinical Study to Compare Efficacy and Safety of Indinol Forto® 200 mg Capsules and Visanne 2 mg Tablets in Treatment of Endometriosis

Not Applicable

Recruiting

• Conditions: Endometriosis
• Interventions: Drug: Indole-3-carbinol; Drug: Dienogest

• Registration Number: NCT07164183
• Lead Sponsor: Alcea

Brief Summary

Prospective open-label randomized parallel groups study to compare efficacy and safety of Indinol Forto® 200 mg capsules and Visanne 2 mg tablets in treatment of endometriosis. This is phase 3 study, based on hypothesis of non-inferiority.

Detailed Description

Prospective open-label randomized parallel groups study to compare efficacy and safety of Indinol Forto® 200 mg capsules and Visanne 2 mg tablets in treatment of endometriosis. This is phase 3 study, based on hypothesis of non-inferiority.

The study population consists of females from 18 to 45 years old inclusively at the moment of screening who have been surgically (laparoscopy or laparotomy) diagnosed with endometriosis within not more than 60 months and not less than 2 weeks of study entry, and reported at least moderate pelvic pain within minimum 2 months of study entry.

Study participants are observed during 1 menstrual cycle during screening period (Screening Cycle). Participants who meet inclusion criteria and don't meet exclusion criteria will be randomly assigned to one of two treatment arms (Group 1: Indinol Forto® 200 mg capsules two times per day or Group 2: Visanne 2 mg tablets once per day). After observation on treatment during 24 weeks (monthly Visits 1-7) the study subjects enter post-treatment period and are observed for one more month (Post-Treatment Period, Visit 8).

Visual Analog Scale (VAS) is used in the study as the main tool for assessment of daily pelvic pain. Cyclic and non-cyclic pain, as well as intensity of vaginal bleeding are assessed daily during the study.

The study primary efficacy endpoint is the change in average daily pelvic pain score (cyclic and non-cyclic, combined) during the 6th treatment period (interval between Visit 6 and Visit 7) in comparison to the Screening period.

Study Timeline

• Status Verified: 2025-09
• Study First Submitted: 2025-09-02
• Study First Submitted QC: 2025-09-02
• Study First Posted: 2025-09-10
• Study Start: 2025-09-11
• Last Update Submitted: 2025-09-12
• Last Update Posted: 2025-09-18
• Primary Completion: 2026-10
• Study Completion: 2026-11-01

Recruitment & Eligibility

• Status: RECRUITING
• Sex: Female
• Target Recruitment: 290

Inclusion Criteria

1. The participant provides written informed consent for participation in the study in accordance with current legislation.
2. Female participants in reproductive/premenopausal period from 18 to 45 years old inclusively (at the moment of signing informed consent).
3. Participants have been surgically (laparoscopy or laparotomy) diagnosed with endometriosis (ICD code #80) within not more than 60 months and not less than 2 weeks of study entry, stage I-III according to endometriosis revised classification of American Fertility Society (R-AFS, 1985)).
4. Participant has had spontaneous, (i.e., without hormonal therapy) regular, menstrual cycles with a cycle length between 24 to 38 days (inclusive) for the past 2 cycles before Visit 0 and during screening period.
5. Participant has no current indications for surgical treatment of endometriosis.
6. Participant has had endometriosis-related pelvic pain assessed with visual analogue scale (VAS) and defined as average daily pain score ≥3.5 cm during 2 menstrual cycles prior to screening (assessed by the participant retrospectively at the moment of screening) and during screening menstrual cycle (according to the data from the participant's diary completed daily).
7. Presence of other symptoms of endometriosis (e.g. dysmenorrhea, dyspareunia, dyschezia, data of ultrasound imaging, or magnetic resonance imaging (MRI).
8. The participant agrees to use highly effective contraception methods described in the protocol from the time of signing informed consent through the whole duration of the study and for 2 months after the study completion.
9. Negative pregnancy test.
10. Participant completed daily diary on minimum 75% of days during screening menstrual cycle.

Exclusion Criteria

1. Presence of contraindications to Indinol Forto (indolcarbinol)
2. Presence of contraindications to Visanne (dienogest)
3. Participant had undiagnosed (unexplained), abnormal, vaginal or urinary tract bleeding within the past 6 months before screening (Visit 0).
4. Participant has chronic pelvic pain not caused by endometriosis, but other gynecological or urological disorders (consequences of inflammatory process, uterine fibroids, pelvic congestion syndrome, etc.).
5. Participant has chronic, non-pelvic pain not caused by endometriosis that requires chronic analgesic or other chronic therapy (including, but not limited to, fibromyalgia, chronic back pain or chronic headaches).
6. Endometrioid cysts ≥ 3 cm.
7. Participant has a surgical history of hysterectomy and/or bilateral oophorectomy; premature ovarian failure. Note: Participants who have undergone surgical sterilization (eg, bilateral salpingectomy, tubal ligation) are permitted in the trial.
8. Participant has a clinically significant gynecologic condition identified in the screening evaluation including, but not limited to, ovarian cysts larger than 3 cm and present longer than 4 months, an active sexually transmitted disease, etc. Note: Participants may be rescreened after completing treatment for infection or for simple ovarian cysts.
9. Participant with endometriosis-related pelvic pain who didn't respond to previous treatment with combined oral contraceptives, GnRH agonists or antagonist, progestins or aromatase inhibitors. Note: Participants who demonstrated partial response or interrupted their treatment due to side effects, may be enrolled in the study.
10. History of malignancy, including suspected malignization of endometriomas within ≤5 years before signing informed consent, except for adequately treated basal cell or squamous cell skin cancer or in situ cervical cancer.
11. Severe renal failure (glomerular filtration rate calculated with Cockcroft-Gault formula is below 30 ml/min/1,73 m2).
12. Systolic blood pressure >160 mm Hg or diastolic blood pressure >90 mm Hg during screening period.
13. Clinically significantly abnormal laboratory tests at Screening, including: alkaline phosphatase (AP), alanine aminotransferase (ALT, SGPT), aspartate aminotransferase (AST, SGOT) >200% of the upper limit of normal, or total bilirubin >150% of the upper limit of normal; hemoglobin <10 g/dl, white blood cell count <2500 in mm³, neutrophil count <1500 in mm³, platelet count <100 х 10³/mm³.
14. Hyperthyroidism (TSH below 0.4 mU/L) or hypothyroidism (TSH above 4.0 mU/L).
15. Positive pregnancy test (including pregnancy within 3 months prior to screening) or lactation period.
16. Other medical conditions that, in the judgment of the Investigator, may increase the risk associated with study participation or may interfere with the interpretation of study results.
17. History of alcohol or substance abuse.
18. Participation in a clinical study within 90 days before screening.
19. Other reasons that, in the judgment of the Investigator, may interfere with participation in the study or may lead to unreasonable risks.
20. Conditions requiring surgery in the period of the study.
21. Conditions requiring therapy prohibited by the study protocol.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Arm 1	Indole-3-carbinol	Participants receive Indinol Forto 200 mg capsules orally twice a day during 24 weeks
Arm 2	Dienogest	Participants receive Visanne 2 mg tablets orally once a day during 24 weeks

Primary Outcome Measures

Name	Time	Method
Average daily pelvic pain score, combined	Visit 7 (week 24)	Change in average daily VAS (in mm) endometriosis-related pelvic pain score (cyclic and non-cyclic, combined) during Treatment Period 6 (assessed at Visit 7) in comparison to Screening Cycle as reported in the participant's diary.

Secondary Outcome Measures

Name	Time	Method
Average daily pelvic pain score, non-cyclic	Visit 7 (week 24)	Change in average daily VAS (mm) endometriosis-related pelvic pain score (non-cyclic) during Treatment Periods in comparison to Screening Cycle as reported in the participant's diary.
Proportion of participants with improvement	Visit 7 (week 24)	Proportion of participants with more than 10 mm reduction (at least minimal clinically significant change) in average daily pelvic pain score (cyclic, non-cyclic and combined) during Treatment Period 6 (assessed at Visit 7) in comparison to Screening Cycle
Change in signs and symptoms of endometriosis assessed in B&B scale	Visit 8 (week 28)	Change in signs and symptoms of endometriosis (including dyspareunia), assessed with B\&B scale at visits 2, 4, 7, 8 in comparison to baseline (Visit 1).
Proportion of participants with full recovery	Visit 7 (week 24)	Proportion of participants with complete absence of endometriosis symptoms, assessed with B\&B scale at Visit 7.
Proportion of participants with recurrence of endometriosis	Visit 8 (week 28)	Proportion of participants with recurrence of endometriosis symptoms, assessed with B\&B scale at Visit 8.
Quality of life change	Visit 8 (week 28)	Change in the quality of life assessment at Visits 2-8 in comparison to Visit 1 according to the EPH-30 questionnaire (total and in each of the modules).
Menstruation duration	Visit 8 (week 28)	Change in average duration of menstruation (in days) during Treatment Period and In Post-Treatment Period in comparison with Screening Cycle.
Menstruation intensity	Visit 8 (week 28)	Proportion of participants with more intensive, less intensive and normal menstruation during Treatment Period and In Post-Treatment Period in comparison with Screening Cycle.
Irregular vaginal bleeding	Visit 8 (week 28)	Proportion of participants with irregular vaginal bleeding during Treatment Periods and in Post-Treatment Period in comparison with Screening Cycle.
Proportion of participants with amenorrhea	Visit 8 (week 28)	Proportion of participants with amenorrhea during Treatment Periods and in Post-Treatment Period.
Number of menstruations	Visit 8 (week 28)	Number of menstruations (counted on day 1) registered during Treatment Periods.
Menstrual Cycle Duration	Visit 7 (week 24)	Duration of the last menstrual cycle (from day 1 of the previous menstruation to day 1 of the last menstruation) registered in the period from Visit 4 to Visit 7 (if applicable).
Endometriosis lesions size	Visit 7 (week 24)	Change in size of the biggest ovarian endometriosis lesion at Visit 7 in comparison to Screening ultrasound assessment.
Average daily pelvic pain score, cyclic	Visit 7 (week 24)	Change in average daily VAS (in mm) endometriosis-related pelvic pain score (cyclic) during Treatment Periods in comparison to Screening Cycle as reported in the participant's diary.

Trial Locations

Locations (1)

Research Site; 🇷🇺 Yaroslavl, Russia