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Linzagolix in Adenomyosis and Recurrent Implantation Failure (LINZA-RIF)

6. Juli 2026 aktualisiert von: Vida Fertility Institute

Efficacy of Linzagolix 200 mg for 3 to 6 Months Prior to Embryo Transfer in Patients With Adenomyosis and Recurrent Implantation Failure: A Prospective Case Series

Adenomyosis is associated with impaired endometrial receptivity and reduced implantation rates in assisted reproduction, even when using high-quality embryos. Linzagolix (Yselty, 200 mg) is an oral GnRH receptor antagonist approved for uterine fibroids with a favourable tolerability profile and rapid elimination half-life (18-20 hours) compared to GnRH agonists.

This prospective case series evaluates the efficacy of linzagolix 200 mg administered for 3 to 6 months prior to embryo transfer in patients with confirmed adenomyosis and recurrent implantation failure (RIF), defined as ≥2 failed transfers with high-quality blastocysts (≥BB Gardner in oocyte donation, or PGT-A confirmed euploid in autologous cycles).

The primary endpoint is the live birth rate (LBR) per embryo transfer. Secondary endpoints include clinical pregnancy rate, miscarriage rate, morphological response of adenomyosis (uterine volume and junctional zone [JZ] thickness assessed by standardised transvaginal ultrasound), and tolerability profile. The study also explores the optimal treatment duration (3 vs 6 months) as a sub-analysis based on morphological response at the month-3 visit.

The study is conducted at three centres of Vida Fertility Institute (Madrid, Alicante and San Sebastián, Spain). Sample size: n=35 patients. Study duration: 24 months.

Studienübersicht

Detaillierte Beschreibung

BACKGROUND:

Current standard of care for adenomyosis prior to embryo transfer in RIF patients consists of GnRH agonist therapy (triptorelin depot) for 1-3 months, with or without letrozole. This approach requires intramuscular administration, is associated with intense vasomotor symptoms, and has a prolonged pharmacological residual effect (4-6 weeks) that complicates cycle planning. No prospective study has evaluated linzagolix in this specific clinical scenario.

DESIGN:

Prospective before-after case series. Each patient serves as her own historical control (prior failed transfers under standard care vs outcome after linzagolix treatment). Treatment duration (3 or 6 months) is determined by morphological response at the month-3 ultrasound visit. Endometrial preparation is initiated 7 days after the last dose of linzagolix.

ULTRASOUND PROTOCOL:

Standardised transvaginal ultrasound measurements at each visit: uterine volume (L x AP x T x 0.523 cm3), junctional zone maximum (mm), junctional zone minimum (mm) and junctional zone difference (mm). All measurements performed in strict sagittal plane with ≥7 MHz transvaginal probe.

VASOMOTOR SYMPTOM MANAGEMENT:

Standardised non-estrogenic supplementation protocol (Cimicifuga racemosa 20 mg, Remifemin) if EVA score ≥4 for hot flushes or insomnia. Suspended simultaneously with the last dose of linzagolix.

REGULATORY FRAMEWORK:

Observational study with medicinal products (EOMF) under Spanish Royal Decree 957/2020. Use of linzagolix in this indication is off-label. Study approved by CEIm del Hospital Clinico San Carlos, Madrid.

Studientyp

Beobachtungs

Einschreibung (Geschätzt)

35

Kontakte und Standorte

Dieser Abschnitt enthält die Kontaktdaten derjenigen, die die Studie durchführen, und Informationen darüber, wo diese Studie durchgeführt wird.

Studienkontakt

Studieren Sie die Kontaktsicherung

Studienorte

Teilnahmekriterien

Forscher suchen nach Personen, die einer bestimmten Beschreibung entsprechen, die als Auswahlkriterien bezeichnet werden. Einige Beispiele für diese Kriterien sind der allgemeine Gesundheitszustand einer Person oder frühere Behandlungen.

Zulassungskriterien

Studienberechtigtes Alter

  • Erwachsene

Akzeptiert gesunde Freiwillige

Nein

Probenahmeverfahren

Nicht-Wahrscheinlichkeitsprobe

Studienpopulation

Women aged 18 to 50 years with confirmed adenomyosis (transvaginal ultrasound or MRI) and recurrent implantation failure, defined as 2 or more failed embryo transfers with high-quality blastocysts (grade BB or above in oocyte donation cycles, or PGT-A confirmed euploid blastocysts in autologous cycles), attending Vida Fertility Institute centres in Madrid, Alicante and San Sebastian, Spain.

Beschreibung

Inclusion Criteria:

  • Age 18 to 50 years
  • Confirmed adenomyosis by transvaginal ultrasound or MRI
  • Recurrent implantation failure defined as 2 or more failed embryo transfers with high-quality blastocysts: oocyte donation recipients (blastocyst grade BB or above, Gardner classification) OR autologous IVF cycles with PGT-A confirmed euploid blastocysts
  • Normal uterine cavity with no submucosal distortion
  • At least 1 suitable embryo available for transfer (blastocyst grade BB or above, or PGT-A euploid)
  • Signed written informed consent including explicit acknowledgement of off-label use of linzagolix

Exclusion Criteria:

  • Untreated hydrosalpinx
  • Untreated stage III-IV endometriosis
  • Major uterine anomaly (uterine septum, bicornuate uterus)
  • Known contraindication to linzagolix including known hepatopathy
  • Prior treatment with linzagolix
  • GnRH analogue treatment within 6 months prior to enrolment
  • BMI greater than 35 kg/m2
  • Prior failed transfers exclusively with embryos below the quality threshold (below BB grade, non-euploid)

Studienplan

Dieser Abschnitt enthält Einzelheiten zum Studienplan, einschließlich des Studiendesigns und der Messung der Studieninhalte.

Wie ist die Studie aufgebaut?

Designdetails

Kohorten und Interventionen

Gruppe / Kohorte
Intervention / Behandlung
Linzagolix 200 mg - Adenomyosis and RIF
Patients with confirmed adenomyosis and recurrent implantation failure (2 or more failed embryo transfers with high-quality blastocysts: grade BB or above in oocyte donation cycles, or PGT-A confirmed euploid in autologous cycles) receiving linzagolix 200 mg orally once daily for 3 to 6 months prior to embryo transfer. Treatment duration is determined by morphological response assessed at the month-3 transvaginal ultrasound visit. Endometrial preparation is initiated 7 days after the last dose of linzagolix.
Linzagolix 200 mg orally once daily for a minimum of 3 months, extendable to 6 months based on morphological response (uterine volume and junctional zone assessment) at the month-3 transvaginal ultrasound visit. Off-label use for adenomyosis prior to embryo transfer.
Andere Namen:
  • Yselty
  • GnRH receptor antagonist

Was misst die Studie?

Primäre Ergebnismessungen

Ergebnis Maßnahme
Maßnahmenbeschreibung
Zeitfenster
Live Birth Rate (LBR) per embryo transfer
Zeitfenster: Up to 12 months after embryo transfer
Proportion of embryo transfers resulting in the birth of a live neonate at or beyond 24 weeks of gestation.
Up to 12 months after embryo transfer

Sekundäre Ergebnismessungen

Ergebnis Maßnahme
Maßnahmenbeschreibung
Zeitfenster
Clinical Pregnancy Rate
Zeitfenster: 6-7 weeks after embryo transfer
Proportion of embryo transfers resulting in the presence of an intrauterine gestational sac with fetal heartbeat on transvaginal ultrasound at 6-7 weeks of gestation.
6-7 weeks after embryo transfer
Miscarriage Rate
Zeitfenster: Up to 22 weeks of gestation
Proportion of clinical pregnancies ending in spontaneous pregnancy loss before 22 weeks of gestation.
Up to 22 weeks of gestation
Change in Uterine Volume
Zeitfenster: Baseline, month 3, month 6 (if applicable) and pre-transfer (approximately 3-7 months from baseline)
Change in uterine volume (cm3) measured by transvaginal ultrasound using the ellipsoid formula (L x AP x T x 0.523) from baseline to post-treatment.
Baseline, month 3, month 6 (if applicable) and pre-transfer (approximately 3-7 months from baseline)
Change in Junctional Zone Maximum Thickness
Zeitfenster: Baseline, month 3, month 6 (if applicable) and pre-transfer (approximately 3-7 months from baseline)
Change in junctional zone (JZ) maximum thickness (mm) measured by standardised transvaginal ultrasound in strict sagittal plane from baseline to post-treatment.
Baseline, month 3, month 6 (if applicable) and pre-transfer (approximately 3-7 months from baseline)
Incidence of Vasomotor Adverse Events
Zeitfenster: Monthly during treatment period (up to 6 months)
Proportion of patients reporting hot flushes, insomnia or other vasomotor symptoms, assessed using a visual analogue scale (EVA 0-10) at each visit.
Monthly during treatment period (up to 6 months)

Mitarbeiter und Ermittler

Hier finden Sie Personen und Organisationen, die an dieser Studie beteiligt sind.

Studienaufzeichnungsdaten

Diese Daten verfolgen den Fortschritt der Übermittlung von Studienaufzeichnungen und zusammenfassenden Ergebnissen an ClinicalTrials.gov. Studienaufzeichnungen und gemeldete Ergebnisse werden von der National Library of Medicine (NLM) überprüft, um sicherzustellen, dass sie bestimmten Qualitätskontrollstandards entsprechen, bevor sie auf der öffentlichen Website veröffentlicht werden.

Haupttermine studieren

Studienbeginn (Geschätzt)

1. September 2026

Primärer Abschluss (Geschätzt)

1. Juli 2028

Studienabschluss (Geschätzt)

1. September 2028

Studienanmeldedaten

Zuerst eingereicht

6. Juli 2026

Zuerst eingereicht, das die QC-Kriterien erfüllt hat

6. Juli 2026

Zuerst gepostet (Tatsächlich)

13. Juli 2026

Studienaufzeichnungsaktualisierungen

Letztes Update gepostet (Tatsächlich)

13. Juli 2026

Letztes eingereichtes Update, das die QC-Kriterien erfüllt

6. Juli 2026

Zuletzt verifiziert

1. Juli 2026

Mehr Informationen

Begriffe im Zusammenhang mit dieser Studie

Plan für individuelle Teilnehmerdaten (IPD)

Planen Sie, individuelle Teilnehmerdaten (IPD) zu teilen?

UNENTSCHIEDEN

Beschreibung des IPD-Plans

Individual participant data will not be shared at this stage due to the small sample size and the need to protect patient privacy in accordance with the General Data Protection Regulation (GDPR, EU 2016/679) and Spanish Organic Law 3/2018 on Personal Data Protection. Anonymised aggregate data may be made available upon reasonable request following publication of the primary results.

Arzneimittel- und Geräteinformationen, Studienunterlagen

Studiert ein von der US-amerikanischen FDA reguliertes Arzneimittelprodukt

Nein

Studiert ein von der US-amerikanischen FDA reguliertes Geräteprodukt

Nein

Diese Informationen wurden ohne Änderungen direkt von der Website clinicaltrials.gov abgerufen. Wenn Sie Ihre Studiendaten ändern, entfernen oder aktualisieren möchten, wenden Sie sich bitte an register@clinicaltrials.gov. Sobald eine Änderung auf clinicaltrials.gov implementiert wird, wird diese automatisch auch auf unserer Website aktualisiert .

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