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Um Estudo para Comparar a Biodisponibilidade em Estado Estacionário de Letrozol Injetável SIE e Letrozol Oral em Mulheres Pós-Menopáusicas com Cancro da Mama Precoce Positivo para Recetores Hormonais (SIE-1)

8 de outubro de 2026 atualizado por: Rovi Pharmaceuticals Laboratories

Um Estudo Aberto, de Sequência Única, para Avaliar a Biodisponibilidade Comparativa em Estado Estacionário do Letrozol Trimestral SIE e do Letrozol Oral de 2,5 mg Uma Vez por Dia (Femara®) em Mulheres Pós-Menopáusicas Tratadas com Terapia Endócrina para Cancro da Mama Precoce com Recetores Hormonais Positivos. (SIE-1)

The study aims to compare the amount of the drug letrozole that gets into the bloodstream after multiple doses of the quarterly injection Letrozole SIE, versus multiple doses of the standard oral daily tablet of letrozole (Femara®), in women who have gone through menopause and have received treatment for hormone receptor-positive early breast cancer. Participants must have completed at least five years of hormone therapy with at least two of those years with letrozole before starting their participation in the study. Women who have completed four years of hormone therapy are also eligible if their doctor considers them at low risk of cancer returning.

Visão geral do estudo

Status

Recrutamento

Condições

Intervenção / Tratamento

Descrição detalhada

The primary objective of the study is to evaluate the steady-state comparative bioavailability of quarterly injectable Letrozole SIE compared to United States (US)-sourced oral Femara® in the US-sourced arm and of quarterly injectable Letrozole SIE compared to European Union (EU)-sourced oral Femara® in the EU-sourced arm, in post-menopausal women treated with endocrine therapy for hormone-receptor positive (HR+) early breast cancer (EBC). The study also aims to characterize the elimination phase of Letrozole SIE after multiple doses.

The study consists of four periods: Screening, Treatment Period 1 (TP1), Treatment Period 2 (TP2) and Extension Period. After the Screening Period, participants will be randomized to two different arms: US-sourced oral Femara® or EU-sourced oral Femara® for 14 days to achieve the steady-state concentrations of letrozole in TP1. After receiving the latest oral letrozole dose, participants from both arms will start TP2. In TP2, quarterly injectable Letrozole SIE will be administered to achieve steady-state. After TP2, a subset of participants (up to 60 participants, regardless of which study arm they belong to) will continue in the study for the assessment of the elimination phase of Letrozole SIE after multiple doses during the Extension Period.

It is estimated that approximately 120 subjects should be randomized.

Tipo de estudo

Intervencional

Inscrição (Estimado)

120

Estágio

  • Fase 1

Contactos e Locais

Esta seção fornece os detalhes de contato para aqueles que conduzem o estudo e informações sobre onde este estudo está sendo realizado.

Contato de estudo

Locais de estudo

      • Alcorcón, Espanha, 28922
        • Recrutamento
        • Hospital Universitario Fundación Alcorcón (Investigational Site number ESP-015)
      • Barcelona, Espanha, 08023
        • Recrutamento
        • NEXT Oncology. Phase I Unit / IOB - Hospital Quironsalud Barcelona (Investigational Site number ESP-002)
      • Granada, Espanha, 18014
        • Recrutamento
        • Hospital Universitario Virgen de las Nieves (Investigational Site number ESP-011)
      • Jaén, Espanha, 23007
        • Recrutamento
        • Hospital Universitario de Jaén (HUJ) (Investigational Site number ESP-005)
      • León, Espanha, 24071
        • Recrutamento
        • Complejo Asistencial Universitario de León - Hospital de León (Investigational Site number ESP-013)
      • Lleida, Espanha, 25198
        • Recrutamento
        • Hospital Universitario Arnau de Vilanova de Lleida (Investigational Site number ESP-003)
      • Manresa, Espanha, 08243
        • Recrutamento
        • Althaia Xarxa Assistencial Universitària de Manresa F.P (Investigational Site number ESP-012)
      • Murcia, Espanha, 30120
        • Recrutamento
        • Hospital Clínico Universitario Virgen de la Arrixaca (Investigational Site number ESP-009)
      • Málaga, Espanha, 29004
        • Recrutamento
        • Hospital Quirónsalud Málaga (Investigational Site number ESP-001)
      • Pozuelo de Alarcón, Espanha, 28223
        • Recrutamento
        • NEXT Oncology Phase I Unit - Hospital Universitario Quironsalud Madrid (Investigational Site number ESP-008)
      • Reus, Espanha, 43204
        • Recrutamento
        • Hospital Universitari Sant Joan de Reus (Investigational Site number ESP-004)
      • Sabadell, Espanha, 08208
        • Recrutamento
        • Consorci Corporació Sanitària Parc Taulí - Hospital de Sabadell (Investigational Site number ESP-006)
      • Santiago de Compostela, Espanha, 15705
        • Recrutamento
        • Hospital Clinico Universitario Santiago de Compostela (Investigational Site number ESP-007)
    • California
      • Beverly Hills, California, Estados Unidos, 90212
        • Recrutamento
        • Precision NextGen Oncology and Research Center (Investigational Site number USA-001)
    • Florida
      • Margate, Florida, Estados Unidos, 33063
        • Recrutamento
        • D&H National Research Centers INC (Investigational Site number USA-002)
      • Port Orange, Florida, Estados Unidos, 32127
        • Recrutamento
        • United Medical Research (Investigational Site number USA-005)
      • Belgrade, Sérvia, 11000
        • Recrutamento
        • Investigational Site number SRB-004
      • Belgrade, Sérvia, 11080
        • Recrutamento
        • Investigational Site number SRB-002
      • Kamenitz, Sérvia, 21204
        • Recrutamento
        • Investigational Site number SRB-001
      • Kragujevac, Sérvia, 34000
        • Recrutamento
        • Investigational Site number SRB-003
      • Niš, Sérvia, 18000
        • Recrutamento
        • Investigational Site number SRB-005

Critérios de participação

Os pesquisadores procuram pessoas que se encaixem em uma determinada descrição, chamada de critérios de elegibilidade. Alguns exemplos desses critérios são a condição geral de saúde de uma pessoa ou tratamentos anteriores.

Critérios de elegibilidade

Idades elegíveis para estudo

18 anos a 80 anos (Adulto, Adulto mais velho)

Aceita Voluntários Saudáveis

Não

Gêneros Elegíveis para o Estudo

Fêmea

Descrição

Inclusion Criteria:

  • Women with weight of ≥50 kg and a Body Mass Index (BMI) ≥19 kg/m2 and ≤39 kg/m2
  • Postmenopausal women.
  • Women with confirmed diagnosis of HR+/HER2- or HR+/HER2+ early stage breast cancer who have completed at least 5 years of endocrine therapy, at least 2 years of which were with letrozole. Participants at a low risk of relapse, as assessed by the investigator, can also be eligible after completing 4 years of adjuvant endocrine therapy, at least 2 of which were with letrozole.
  • Women in good health.
  • Women who have undergone breast imaging per applicable guidelines (e.g., mammogram) within the last 12 months with no evidence of malignancy (documentation required), and if not done, must be willing to have 1 performed prior to baseline.

Exclusion Criteria:

  • Presence of an uncontrolled, unstable, clinically significant medical condition.
  • Have used estrogen or progesterone systemic or topical therapy, oral contraceptives, androgens, LH-releasing hormone analogs, prolactin inhibitors, or antiandrogens within 3 months prior to screening.
  • Use of inducers or inhibitors of CYP3A4 and CYP2A6.
  • Diagnosed with osteoporosis.
  • Preexisting cardiovascular disease
  • Positive result for hepatitis B surface antigen, hepatitis B core antibody, hepatitis C antibody, or HIV antibodies.

Plano de estudo

Esta seção fornece detalhes do plano de estudo, incluindo como o estudo é projetado e o que o estudo está medindo.

Como o estudo é projetado?

Detalhes do projeto

  • Finalidade Principal: Tratamento
  • Alocação: Randomizado
  • Modelo Intervencional: Atribuição Paralela
  • Mascaramento: Nenhum (rótulo aberto)

Armas e Intervenções

Grupo de Participantes / Braço
Intervenção / Tratamento
Experimental: Femara® oral de origem dos EUA

US-sourced Femara® 2.5 mg/day oral for 14 days (treatment period 1) + quarterly injectable Letrozole SIE (treatment period 2)

Experimental: Femara® oral de origem da UE

EU-sourced oral Femara® 2.5 mg/day for 14 days (treatment period 1) + quarterly injectable Letrozole SIE (treatment period 2)

O que o estudo está medindo?

Medidas de resultados primários

Medida de resultado
Descrição da medida
Prazo
Area under the concentration-time curve within a dosing interval at Steady-State (SS AUCtau)
Prazo: After multiple doses of Letrozole SIE until Day 281 TP2 and after multiple doses of US-sourced oral Femara® or EU-sourced oral Femara® on Day 14 TP1

Individual and mean area under the concentration-time curve within a dosing interval at steady-state

After multiple doses of Letrozole SIE until Day 281 TP2 and after multiple doses of US-sourced oral Femara® or EU-sourced oral Femara® on Day 14 TP1

Medidas de resultados secundários

Medida de resultado
Descrição da medida
Prazo
Adverse Events
Prazo: From the time of obtaining signed informed consent until the final follow-up visit on Day 281 (or Day 421 for the subset of participants in the Extension Period)

Incidence of adverse events (type, severity, seriousness, and relationship to study drug), including the incidence of treatment-emergent adverse events (TEAEs), the incidence of serious TEAEs, and the incidence of TEAEs leading to treatment discontinuation.

From the time of obtaining signed informed consent until the final follow-up visit on Day 281 (or Day 421 for the subset of participants in the Extension Period)
Injection site reactions
Prazo: At pre-dose and 1 hour after each Letrozole SIE administration in TP2

Incidence of injection site reactions

At pre-dose and 1 hour after each Letrozole SIE administration in TP2
Injection-related pain score
Prazo: From baseline TP2 to the follow-up visit on Day 281

Changes in injection-related pain score by numeric rating scale (NRS). The NRS evaluates the intensity of injection-related pain experienced at the time of Letrozole SIE administration. It is scored from 0 to 10 (0 meaning no pain and 10 meaning the worst possible pain).

From baseline TP2 to the follow-up visit on Day 281
Bone mineral density (BMD) by dual energy x-ray absorptiometry (DXA)
Prazo: From screening to Day 281 TP2

Changes in bone mineral density BMD by DXA

From screening to Day 281 TP2
Average plasma drug concentration during a dosing interval at Steady-State (SS Cave)
Prazo: After multiple doses of Letrozole SIE until Day 281 TP2 and after multiple doses of US-sourced oral Femara® or EU-sourced oral Femara® at Day 14 TP1

Individual and mean steady-state average plasma drug concentration during a dosing interval

After multiple doses of Letrozole SIE until Day 281 TP2 and after multiple doses of US-sourced oral Femara® or EU-sourced oral Femara® at Day 14 TP1
Minimum drug concentration at steady-state (Cmin ss)
Prazo: After multiple doses of Letrozole SIE until Day 281 TP2 and after multiple doses of US-sourced oral Femara® or EU-sourced oral Femara® at Day 14 TP1

Minimum drug concentration at steady-state

After multiple doses of Letrozole SIE until Day 281 TP2 and after multiple doses of US-sourced oral Femara® or EU-sourced oral Femara® at Day 14 TP1
Maximum plasma concentration at steady-state (Cmax ss)
Prazo: After multiple doses of Letrozole SIE at Day 281 TP2 and after multiple doses of US-sourced oral Femara® or EU-sourced oral Femara® at Day 14 TP1

Maximum plasma concentration at steady-state

After multiple doses of Letrozole SIE at Day 281 TP2 and after multiple doses of US-sourced oral Femara® or EU-sourced oral Femara® at Day 14 TP1
Letrozole blood level percent fluctuation
Prazo: After multiple doses of Letrozole SIE at Day 281 TP2 and after multiple doses of US-sourced oral Femara® or EU-sourced oral Femara® at Day 14 TP1

Individual and mean letrozole blood percent fluctuation

After multiple doses of Letrozole SIE at Day 281 TP2 and after multiple doses of US-sourced oral Femara® or EU-sourced oral Femara® at Day 14 TP1
Time to peak observed concentration (Tmax)
Prazo: After multiple doses of Letrozole SIE until Day 281 TP2 and after multiple doses of US-sourced oral Femara® or EU-sourced oral Femara® at Day 14 TP1

Time to peak observed concentration

After multiple doses of Letrozole SIE until Day 281 TP2 and after multiple doses of US-sourced oral Femara® or EU-sourced oral Femara® at Day 14 TP1
Steady-State (SS)
Prazo: After multiple doses of Letrozole SIE until Day 281 TP2 and after multiple doses of US-sourced oral Femara® or EU-sourced oral Femara® at Day 14 TP1

Characterization of the steady-state

After multiple doses of Letrozole SIE until Day 281 TP2 and after multiple doses of US-sourced oral Femara® or EU-sourced oral Femara® at Day 14 TP1
Terminal rate constant (λz)
Prazo: After multiple doses of Letrozole SIE in TP2 until Day 421 in the Extension Period

Individual and mean Terminal rate constant (λz) after multiple doses of Letrozole SIE in the subset of participants in the Extension Period

After multiple doses of Letrozole SIE in TP2 until Day 421 in the Extension Period
Terminal half-life (t1/2)
Prazo: After multiple doses of Letrozole SIE in TP2 until Day 421 in the Extension Period

Individual and mean Terminal half-life after multiple doses of Letrozole SIE in the subset of participants in the Extension Period

After multiple doses of Letrozole SIE in TP2 until Day 421 in the Extension Period
Area under the curve extrapolated to infinity (AUC∞)
Prazo: After multiple doses of Letrozole SIE in TP2 until Day 421 in the Extension Period

Individual and mean Area under the curve extrapolated to infinity after multiple doses of Letrozole SIE in the subset of participants in the Extension Period

After multiple doses of Letrozole SIE in TP2 until Day 421 in the Extension Period
Area under the curve that is extrapolated (AUCextrap)
Prazo: After multiple doses of Letrozole SIE in TP2 until Day 421 in the Extension Period

Percentage of area under the curve that is extrapolated after multiple doses of Letrozole SIE in the subset of participants in the Extension Period

After multiple doses of Letrozole SIE in TP2 until Day 421 in the Extension Period

Outras medidas de resultado

Medida de resultado
Descrição da medida
Prazo
Hormone supression
Prazo: From screening to the final follow-up visit on Day 281 (or Day 421 for the subset of participants in the Extension Period)

Analysis of letrozole exposure and hormone suppression measuring the sex hormone estrone (E1), sulfate estrone (SE1), and estradiol (E2) plasma levels.

From screening to the final follow-up visit on Day 281 (or Day 421 for the subset of participants in the Extension Period)
CYP2A6 genotyping
Prazo: From screening to final follow-up visit Day 281 (or Day 421 for the subset of participants in the Extension Period)

Proportion of participants in each CYP2A6 metabolizer phenotype category (normal, intermediate, slow)

From screening to final follow-up visit Day 281 (or Day 421 for the subset of participants in the Extension Period)

Colaboradores e Investigadores

É aqui que você encontrará pessoas e organizações envolvidas com este estudo.

Patrocinador

Datas de registro do estudo

Essas datas acompanham o progresso do registro do estudo e os envios de resumo dos resultados para ClinicalTrials.gov. Os registros do estudo e os resultados relatados são revisados ​​pela National Library of Medicine (NLM) para garantir que atendam aos padrões específicos de controle de qualidade antes de serem publicados no site público.

Datas Principais do Estudo

Início do estudo (Real)

8 de junho de 2026

Conclusão Primária (Estimado)

1 de maio de 2028

Conclusão do estudo (Estimado)

1 de outubro de 2028

Datas de inscrição no estudo

Enviado pela primeira vez

22 de janeiro de 2026

Enviado pela primeira vez que atendeu aos critérios de CQ

3 de fevereiro de 2026

Primeira postagem (Real)

10 de fevereiro de 2026

Atualizações de registro de estudo

Última Atualização Postada (Real)

9 de outubro de 2026

Última atualização enviada que atendeu aos critérios de controle de qualidade

8 de outubro de 2026

Última verificação

1 de outubro de 2026

Mais Informações

Termos relacionados a este estudo

Outros números de identificação do estudo

  • ROV-SIE-2025-01
  • 2025-523269-31-00 (Ctis)
  • 2025 (Concessão/Contrato do NIH dos EUA)

Informações sobre medicamentos e dispositivos, documentos de estudo

Estuda um medicamento regulamentado pela FDA dos EUA

Sim

Estuda um produto de dispositivo regulamentado pela FDA dos EUA

Não

Essas informações foram obtidas diretamente do site clinicaltrials.gov sem nenhuma alteração. Se você tiver alguma solicitação para alterar, remover ou atualizar os detalhes do seu estudo, entre em contato com register@clinicaltrials.gov. Assim que uma alteração for implementada em clinicaltrials.gov, ela também será atualizada automaticamente em nosso site .