Recruiting

Tamoxifen

Sponsor:

M.D. Anderson Cancer Center

Code:

NCT05056857

Conditions

Breast Carcinoma

Eligibility Criteria

Sex: Female

Age: 18+

Healthy Volunteers: Accepted

Interventions

Biospecimen Collection

Electronic Health Record Review

Study Details

Brief summary:

This study examines the long-term effects of tamoxifen (TAM) treatment on excessive production of neutrophil extracellular traps (NET) and their impact on breast cancer and side effects. NET are produced by the body to fight infections but have also been linked to side effects caused by the body's immune system. Treatment with tamoxifen increases the production of NETs. This study may help researchers determine if the increased number of NETs in the body has a damaging effect in breast cancer.

Conditions

Breast Carcinoma

Study ID

NCT05056857

Start date

Oct 1, 2021

Status verified date

Oct, 2026

Completion date

Oct 31, 2026

Anticipated

Primary completion date

Oct 31, 2026

Anticipated

Eligibility Criteria

Eligibility Criteria

Sex: Female

Age: 18+

Healthy Volunteers: Accepted

Inclusion Criteria:

  • Female
  • Age criteria for pre-menopausal group: Equal to or greater than 18 years of age and less than or equal to 45 years of age. Patients of age 46-50 will be included if they have not had menstrual cessation for 12 consecutive months.
  • Age criteria for menopausal group: At least 51 years of age (median age of menopause). Menopause is defined as cessation of menstrual cycle for 12 consecutive months.
  • Diagnosed with ER+ breast cancer
  • Being treated with tamoxifen (TAM) for at least 6 months
  • CONTROL SUBJECTS: Newly diagnosed ER+ breast cancer patients of the same age group as above on TAM for 0-6 months. This criterion is based on our preliminary results showing that patients taking TAM for 6-7 months exhibit near baseline level of NETs

Exclusion Criteria:

  • Pregnant -The immune modulations geared toward maintenance of pregnancy are known to cause wide-spread alterations in innate and adaptive immune cell functions. In this scenario, divorcing the pregnancy-related changes in myeloid cell function from those relevant to sepsis and cancer will be complicated.
  • History of severe congenital neutropenia due to genetic disorders, such as Kostmann Disorder (HAX1 gene mutation), ELA2 gene mutation, Wiskott-Aldrich syndrome (WAS), Growth Factor Independent 1 Protein (GFI1) gene mutation, Colony Stimulating Factor 3 Receptor (CSF3R) gene mutation, Schwachman-Diamond Syndrome, Barth Syndrome, WHIM Syndrome, and Chadiak-Higashi Syndrome (this list notably does not include Myelodysplastic Syndrome, or Acute/Chronic Myeloid Leukemia)
  • History of autoimmune disorders, which can affect the body's inflammatory response, such as rheumatoid arthritis, lupus, Crohn's disease, multiple sclerosis, and psoriasis.
  • History of chronic viral infections (human immunodeficiency virus \[HIV\], hepatitis), which can lead to reduced or variable immune cell function.
  • A recent positive coronavirus disease (COVID) test

Study Design

Enrollment

290 participants

Anticipated

Interventions and Outcome Measures

Arms

Observational (biospecimen collection, medical chart review)

Patients undergo collection of blood samples and their medical charts are reviewed.

Interventions

Biospecimen Collection

Undergo collection of blood sample

Electronic Health Record Review

Medical charts are reviewed

Primary outcome measure

  • Quantification of neutrophil extracellular traps (NETs) in blood samples of pre- and postmenopausal women being treated with tamoxifen for varying periods of time. [ Time Frame: through study completion, an average of 1 year ]

Central Contacts and Locations

Central contacts

Jyotika Sharma

281-787-7774jsharma1@mdanderson.org

Locations

M D Anderson Cancer Center

Recruiting

Houston, Texas, United States, 77030

Contacts

Jyotika Sharma

281-787-7774jsharma1@mdanderson.org

Principal Investigator:

Jyotika Sharma

More Information

Sponsor

M.D. Anderson Cancer Center

Last update posted

Oct 13, 2026

Last verified

Oct, 2026

Trial information was received from ClinicalTrials.gov and was last updated on 2026-10-25. This information was provided to ClinicalTrials.gov by M.D. Anderson Cancer Center on 2026-10-13. Recruitment status is synced daily from ClinicalTrials.gov and may not reflect the sponsor's current status. Confirm during your call.