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Anti-HER2 treatment Discontinuation Guided by ctDNA in Patients with HER2-Positive Metastatic Breast Cancer with Sustained Disease Control: PHENIX Trial

Status
Not yet recruiting
Phases
Phase 2
Study type
Interventional
Source
EU CTIS
Registry ID
CTIS2026-526268-18-00
Enrollment
239
Registered
2026-10-19
Start date
Unknown
Completion date
Unknown
Last updated
2026-10-19

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Breast Cancer

Brief summary

Proportion of patients with undetectable MRD by ctDNA, who, after discontinuation of anti-HER2 therapy, remain free from mBC progression over a two-year follow-up period. Anti-HER2 therapy could be reintroduced upon molecular progression.

Interventions

DRUGPerjeta 420 mg concentrate for solution for infusion

Sponsors

Fundacion Para El Fomento De La Investigacion Sanitaria Y Biomedica De La Comunitat Valenciana
Lead SponsorOTHER

Eligibility

Sex/Gender
All
Age
18 Years to No maximum

Design outcomes

Primary

MeasureTime frame
Proportion of patients with undetectable MRD by ctDNA, who, after discontinuation of anti-HER2 therapy, remain free from mBC progression over a two-year follow-up period. Anti-HER2 therapy could be reintroduced upon molecular progression.—

Outcome results

None listed

Source: EU CTIS · Data processed: Oct 20, 2026