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- Klinische proef NCT01669343
Aromatase Inhibitor Host Factors Study
Patient-related Predictors of Estrogen Suppression in Postmenopausal Women Using Adjuvant Letrozole
The purpose of this study is to examine how key patient factors, including body size affect how well letrozole suppresses circulating estrogen levels.
This study has two components: (1) Part A - an observational phase to evaluate the impact of vitamin D and obesity on estrogen suppression in post-menopausal women already receiving letrozole treatment, and (2) Part B - an interventional phase for women with body mass index (BMI) > 25 kg/m2 to assess the effect of double AI dose on estrogen levels.
If BMI or other patient factors reduce the effectiveness of letrozole, modifications to treatment recommendations and studies to test higher dosing of letrozole may be needed to maximize the benefit of this treatment and minimize the risk of the breast cancer coming back.
Studie Overzicht
Gedetailleerde beschrijving
Studietype
Inschrijving (Werkelijk)
Fase
- Niet toepasbaar
Contacten en locaties
Studie Locaties
-
-
Ontario
-
Toronto, Ontario, Canada, M5G 1X5
- Mount Sinai Hospital
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Toronto, Ontario, Canada, M5G 1M9
- Princess Margaret Hospital
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Toronto, Ontario, Canada, M5S 1B1
- Women's College Hospital
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-
Deelname Criteria
Geschiktheidscriteria
Leeftijden die in aanmerking komen voor studie
- Kind
- Volwassen
- Oudere volwassene
Accepteert gezonde vrijwilligers
Geslachten die in aanmerking komen voor studie
Beschrijving
Inclusion Criteria:
- Postmenopausal female patients
- histological confirmed diagnosis of estrogen receptor and/or progesterone receptor positive breast cancer (Stage I-III) who have completed local therapy
- Currently prescribed and taking letrozole 2.5 mg daily for a minimum of 3 months
- Willing to provide written informed consent to participate
- for the experimental arm: all of the above and body mass index (BMI) > 25 kg/m2
Exclusion Criteria:
Known abnormal liver or renal function defined by:
- Serum Creatinine > 1.25 times institutional upper limit of normal (ULN) or Calculated Creatinine Clearance < 40 mL/min
- Serum Bilirubin, Aspartate transaminase (AST) or alanine transaminase (ALT) > 1.5 times ULN
- Presence of persistent local or known metastatic cancer
Studie plan
Hoe is de studie opgezet?
Ontwerpdetails
- Primair doel: Behandeling
- Toewijzing: NVT
- Interventioneel model: Opdracht voor een enkele groep
- Masker: Geen (open label)
Wapens en interventies
Deelnemersgroep / Arm |
Interventie / Behandeling |
|---|---|
|
Ander: Post-menopausal Women Using Adjuvant Letrozole
Part A Routine Care Letrozole; Part B Double Dose Letrozole in overweight/obese participants
|
Part A Monitor standard of care letrozole use for 28 days; measure blood levels of estrogens and vitamin D at start and end of period.
Part B In overweight/obese participants who completed Part A, provide a double dose of letrozole and monitor use for 28 days; measure blood levels of estrogens and vitamin D at start and end of period.
Andere namen:
|
Wat meet het onderzoek?
Primaire uitkomstmaten
Uitkomstmaat |
Maatregel Beschrijving |
Tijdsspanne |
|---|---|---|
|
Part A Correlation of Day 29 Estradiol With BMI
Tijdsspanne: Day 29
|
Determine if estradiol levels vary with BMI levels after 28 days of monitored adherence to standard dose letrozole, by calculating the Pearson correlation between estradiol and log-transformed BMI
|
Day 29
|
|
Part A Correlation of Day 29 Estrone With BMI
Tijdsspanne: Day 29
|
Determine if estrone levels vary with BMI levels after 28 days of monitored adherence to standard dose letrozole, by calculating the Pearson correlation between estrone and log-transformed BMI
|
Day 29
|
|
Part A Correlation of Day 29 Estradiol With Vitamin D
Tijdsspanne: Day 29
|
Determine if estradiol levels vary with Vitamin D levels levels after 28 days of monitored adherence to standard dose letrozole, by calculating the Pearson correlation between estradiol and log-transformed Vitamin D level
|
Day 29
|
|
Part A Correlation of Day 29 Estrone With Vitamin D
Tijdsspanne: Day 29
|
Determine if estrone levels vary with Vitamin D levels levels after 28 days of monitored adherence to standard dose letrozole, by calculating the Pearson correlation between estrone and log-transformed Vitamin D level
|
Day 29
|
|
Part B Change in Estradiol Level After Double Dose of Letrozole
Tijdsspanne: Day 29 to Day 58
|
In overweight/obese patients enrolled in part B, determine if blood levels of estradiol levels changed from before to after the double dose of letrozole
|
Day 29 to Day 58
|
Secundaire uitkomstmaten
Uitkomstmaat |
Maatregel Beschrijving |
Tijdsspanne |
|---|---|---|
|
Plasma Letrozole
Tijdsspanne: Day 29 and day 58
|
Day 29 and day 58
|
|
|
Endocrine Symptoms During Part A of Study
Tijdsspanne: baseline, day 29 (end of part A)
|
Functional Assessment of Cancer Therapy - Endocrine Sub-scale (FACT-ES) consists of 19 questions answered of a Likert scale.
The sub-scale score ranges from 0 to 76 and the higher the score the better the quality of life
|
baseline, day 29 (end of part A)
|
|
Endocrine Symptoms During Part B of the Study
Tijdsspanne: day 29 (end of part A) and day 58 (end of part B)
|
Functional Assessment of Cancer Therapy - Endocrine Sub-scale (FACT-ES) consists of 19 questions answered of a Likert scale.
The sub-scale score ranges from 0 to 76 and the higher the score the better the quality of life
|
day 29 (end of part A) and day 58 (end of part B)
|
Andere uitkomstmaten
Uitkomstmaat |
Tijdsspanne |
|---|---|
|
Musculoskeletal Symptoms
Tijdsspanne: baseline (day 1), day 29 (end of part A) and day 58 (end of part B)
|
baseline (day 1), day 29 (end of part A) and day 58 (end of part B)
|
Medewerkers en onderzoekers
Onderzoekers
- Hoofdonderzoeker: Srikala Sridhar, M.D., Princess Margaret Hospital, Canada
Studie record data
Bestudeer belangrijke data
Studie start (Werkelijk)
Primaire voltooiing (Werkelijk)
Studie voltooiing (Werkelijk)
Studieregistratiedata
Eerst ingediend
Eerst ingediend dat voldeed aan de QC-criteria
Eerst geplaatst (Schatting)
Updates van studierecords
Laatste update geplaatst (Werkelijk)
Laatste update ingediend die voldeed aan QC-criteria
Laatst geverifieerd
Meer informatie
Termen gerelateerd aan deze studie
Trefwoorden
Aanvullende relevante MeSH-voorwaarden
- Huidziektes
- Neoplasmata
- Neoplasmata per site
- Borst ziekten
- Borstneoplasmata
- Fysiologische effecten van medicijnen
- Moleculaire mechanismen van farmacologische werking
- Enzymremmers
- Antineoplastische middelen
- Hormonen, hormoonvervangers en hormoonantagonisten
- Hormoon antagonisten
- Aromatase-remmers
- Steroïde syntheseremmers
- Oestrogeen antagonisten
- Letrozol
Andere studie-ID-nummers
- AI Host Factors
Plan Individuele Deelnemersgegevens (IPD)
Bent u van plan om gegevens van individuele deelnemers (IPD) te delen?
Beschrijving IPD-plan
The data supporting the related manuscript are kept in institutional file storage on an internal server at Lunenfeld-Tanenbaum Research Institute. There are de-identification concerns in small, regionally restricted, clinical datasets which prevent these data being openly available, but data will be made available at reasonable request from the corresponding author for up to and including 5 years from publication of the related manuscript.
For all data requests please contact:
Dr David Cescon, Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada. Dave.Cescon@uhn.ca
IPD-tijdsbestek voor delen
IPD-toegangscriteria voor delen
IPD delen Ondersteunend informatietype
- LEERPROTOCOOL
- SAP
- ICF
- MVO
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