OnCo
pairingsPairing

Early FDG-PET response → chemotherapy omission (HER2+)

A PET scan after two cycles of antibodies alone identifies women who can be cured without chemotherapy.

PHERGain: PET responders continued trastuzumab + pertuzumabendocrine therapy) alone; those with pCR skipped chemotherapy, with 3-year iDFS 95.4%. Phase 3 PHERGain-2 and similar response-adapted designs (WSG-ADAPT) are testing the approach more broadly.

FDG PET→ selectsDual HER2 blockadediagnostic → therapeutic
Rationale
Metabolic response at 2 cycles predicts pCR to antibody-only therapy; pCR predicts excellent long-term outcome.
Evidence
Randomised phase 2 meeting co-primary endpoints; phase 3 pending.

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