Clinical trial NCT06033092: Low Dose TamOxifen and LifestylE Changes for bReast cANcer prevenTion
Official title: Low Dose TamOxifen and LifestylE Changes for bReast cANcer prevenTion: a Randomized Phase II Biomarker Trial in Subjects at Increased Risk
Study type: INTERVENTIONAL
Overall status: RECRUITING
Phase: PHASE2
Conditions: BRCA Mutation
PALB2 Gene Mutation
Ductal Carcinoma in Situ
Lobular Carcinoma in Situ
ATM Gene Mutation
CHEK2 Gene Mutation
CDH1 Gene Mutation
RAD51C Gene Mutation
RAD51D Gene Mutation
Keywords: Low Dose Tamoxifen
Intermittent Caloric Restriction
Sex Hormone Binding Globulin
Lifestyle
Lead sponsor: European Institute of Oncology
Sponsor class: OTHER
Collaborators: name: Ente Ospedaliero Ospedali Galliera
name: Istituto Oncologico Veneto IRCCS
name: Istituto Nazionale Tumori IRCCS - Fondazione G. Pascale
First posted: 2023-09-13
Enrollment: 200
Sex: FEMALE
Minimum age (years): 18
Maximum age (years): 70
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: PREVENTION

Brief summary: Circulating levels of Sex Hormone Binding Globulin (SHBG) are significantly associated with a decreased risk of breast cancer.

The main aim of this clinical trial is to verify whether Low Dose Tamoxifen (LDT) increases circulating levels of SHBG more than lifestyle intervention (LI) with or without intermittent caloric restriction (ICR) after 6 months in women at increased risk of breast cancer (i.e., healthy participants carriers of a germline pathogenic/likely pathogenetic variant in at least one of the following genes: BRCA1, BRCA2, PALB2, ATM, CHEK2, CDH1, RAD51C or RAD51D, or with \> 5% breast cancer risk at 10 years, using the Tyrer Cuzick or the Breast Cancer Surveillance Consortium Risk models or with a recently resected intraepithelial neoplasia of the breast (IEN).

The secondary aims are:

* to verify whether ICR significantly modulates primary and secondary endpoints such as Homeostasis Model Assessment (HOMA) index, immune and inflammatory markers, lipid profile, Adiponectin/Leptin (A/L) ratio, quality of life (QoL), Body mass index (BMI), fat body composition, safety and toxicity;
* to verify whether LDT significantly modulates secondary endpoints, such as HOMA-index, immune and inflammatory markers, lipid profile, A/L ratio, QoL, BMI, fat body composition, safety and toxicity;
* to investigate differences in microbiome composition by arms and the effect of changes in microbiome on QoL taking into account circulating biomarkers, cytokines, immune modulators, and inflammatory proteins in serum;
* to investigate MD (Mammographic Breast Density) changes by LDT vs. LI, with or without ICR. This aim will be performed in a subgroup of participants (not all the participants will undergo mammography due to younger age).

Detailed description: Italian, multicenter, phase II, biomarker trial. A total of 200 women aged 18-70 years will be randomly assigned (1:1:1:1) to one of the four intervention arms Arm 1: Low dose Tamoxifen (LDT) i.e. 10 mg every other day; Arm 2: Low dose Tamoxifen (LDT) + Intermittent Caloric Restriction (ICR); Arm 3: Lifestyle intervention (LI) using a step counter; Arm 4: Lifestyle intervention (LI) using a step counter + Intermittent Caloric Restriction (ICR).

Participants will be stratified by center and by disease status (high risk vs. previous IEN) and intervention will last six months for all arms.

Eligibility criteria: Inclusion Criteria:

1. Women between 18 and 70 years old;
2. Healthy participants carriers of a germline pathogenic/likely pathogenetic variant in at least one of the following genes BRCA1, BRCA2, PALB2, ATM, CHEK2, CDH1, RAD51C or RAD51D, or

   \> 5% breast cancer risk at 10 years, using the Tyrer Cuzick or the Breast Cancer Surveillance Consortium Risk models, or

   with previous diagnosis of intraepithelial neoplasia (surgery for ADH, LCIS, ER positive DCIS) within the last 3 years;
3. Ability to understand and the willingness to sign a written informed consent document;
4. Eastern Cooperative Oncology Group (ECOG) Performance Status ≤1;

5a. For high-risk strata: A negative mammogram or any radiological image based on age and center protocol screening within 6 months before baseline visit;

5b. For IEN Strata: A negative mammogram within 12 months before baseline visit;

6. A negative transvaginal ultrasound within 6 months before baseline visit.

Exclusion Criteria:

1. Diagnosis of ER-negative (\<10%) DCIS, or history of invasive breast cancer;
2. Previous treatment with SERMs or any other hormonal treatment for breast neoplasms;
3. BMI \< 18.5 Kg/m2 and/or Malnutrition Universal Screening Tool (MUST) score ≥2 and/or any current or past eating disorders;
4. Any diagnosis of invasive neoplasia, except non-melanoma skin cancer, in the previous 5 years;
5. Any tamoxifen contraindications (abnormal liver function, previous ischemic heart disease, endometrial disorder, previous deep venous thrombosis, history of pulmonary embolus, current or suspected glaucoma, retinopathy and cataract);
6. Current use of warfarin or other anticoagulant drugs
7. Bilateral mastectomy;
8. Pregnancy or desire to become pregnant in the subsequent 9 months after treatment cessation;
9. Diabetes or any other clinical condition that at the investigator's discretion contraindicates the proposed intervention.
10. No hormonal contraception is allowed during study intervention. Non-hormonal methods will be advised for women of childbearing potential (WOCBP)

Primary outcomes:
measure: Post intervention levels of circulating binding globulin
timeFrame: Through study completion, an average of 6 months
Secondary outcomes:
Other outcomes:
Locations:
city: Genoa
country: Italy
facility: E.O. Galliera
city: Milan
country: Italy
facility: Istituto Europeo di Oncologia
city: Napoli
country: Italy
facility: Istituto Nazionale Tumori G. Pascale
city: Padova
country: Italy
facility: Istituto Oncologico Veneto
Study officials:
affiliation: Istituto Europeo di Oncologia
name: Bernardo Bonanni, MD
role: PRINCIPAL_INVESTIGATOR
References: