# Recurrent or metastatic breast cancer biospecimen registry

Source: https://onco.cc/trials/nct03737695/  
OnCo record `nct03737695` (Trial). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

This registry collects clinical information, blood and tumor samples from people with recurrent or metastatic breast cancer. It aims to understand tumor spread and differences in treatment response.

## Summary

This registry collects clinical information, blood and tumor samples from people with recurrent or metastatic breast cancer. It aims to understand tumor spread and differences in treatment response.

Observational study registered as NCT03737695, sponsored by Mayo Clinic. Registry enrollment is 300 participants (estimated). Registry status checked October 10, 2026: active not recruiting. UCSF lists this study as closed to local enrollment; local availability and overall registry status are separate. See the registry for full eligibility and current sites.

## Fields

- Kind: Trial
- Status: active
- Last checked: 2026-10-10
- Also known as: Clinical Information and Biospecimen Collection From Patients With Recurrent or Stage IV Breast Cancer
- Tags: ucsf-breast-coverage; observational
- Registry id: NCT03737695
- Phase: observational
- Setting: Recurrent or stage IV breast cancer
- Sponsor: Mayo Clinic

## Sources

- ClinicalTrials.gov NCT03737695: https://clinicaltrials.gov/study/NCT03737695
- UCSF study listing and local availability: https://clinicaltrials.ucsf.edu/trial/NCT03737695

## Connected records

- cancers: [Breast cancer (all types)](https://onco.cc/cancers/breast-cancer/)
- institutions: [UCSF Helen Diller Family Comprehensive Cancer Center](https://onco.cc/institutions/ucsf/)

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