{"entity":{"id":"nct03737695","kind":"trial","name":"Recurrent or metastatic breast cancer biospecimen registry","aka":["Clinical Information and Biospecimen Collection From Patients With Recurrent or Stage IV Breast Cancer"],"tldr":"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.\n\nObservational 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.","status":"active","asOf":"2026-10-10","links":[{"label":"ClinicalTrials.gov NCT03737695","url":"https://clinicaltrials.gov/study/NCT03737695"},{"label":"UCSF study listing and local availability","url":"https://clinicaltrials.ucsf.edu/trial/NCT03737695"}],"tags":["ucsf-breast-coverage","observational"],"related":[],"cancers":["breast-cancer"],"sections":[],"technologies":[],"targets":[],"drugs":[],"companies":[],"institutions":["ucsf"],"pathways":[],"terms":[],"trials":[],"people":[],"bottlenecks":[],"keyPapers":[],"journals":[],"dependsOn":[],"notes":[],"nct":"NCT03737695","phase":"observational","setting":"Recurrent or stage IV breast cancer","sponsor":"Mayo Clinic","participation":[{"nct":"NCT03737695","source":"https://clinicaltrials.gov/study/NCT03737695","fetchedAt":"2026-10-10T20:54:22.869192Z","studySha256":"5c1ceb8dda2e1225c9c0ae2d637154853bc2fb63312b79fcd243c93461d3f15e","overallStatus":"ACTIVE_NOT_RECRUITING","lastUpdatePosted":"2026-06-04","leadSponsor":"Mayo Clinic","collaboratorCount":0,"minimumAge":"18 Years","sex":"ALL","healthyVolunteers":false,"hasEligibility":true,"enrolment":300,"enrolmentType":"ESTIMATED","siteCount":14,"recruitingSiteCount":0,"countries":["United States"]}],"started":"2019-09-16","startedType":"actual","enrolledBasis":"registry","outcomes":[]},"route":"/trials/nct03737695/","neighbours":{"cancer":[{"id":"breast-cancer","kind":"cancer","name":"Breast cancer (all types)","route":"/cancers/breast-cancer/"}],"institution":[{"id":"ucsf","kind":"institution","name":"UCSF Helen Diller Family Comprehensive Cancer Center","route":"/institutions/ucsf/"}]}}