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Real-World Treatment of ADC-Resistant HER2-Low Advanced Breast Cancer

8 maj 2026 uppdaterad av: The First Affiliated Hospital with Nanjing Medical University

Optimal Treatment Strategies for ADC-Resistant HER2-Low Advanced Breast Cancer: A Multicenter, Retrospective Real-World Study

This is a multicenter, retrospective real-world study aiming to evaluate the efficacy and safety of post-antibody-drug conjugate (post-ADC) treatment strategies in patients with HER2-low advanced breast cancer who have developed resistance to prior ADC therapy. The study plans to enroll approximately 220 eligible patients from three centers in China (Jiangsu Province Hospital, Nanjing Drum Tower Hospital, and Nanjing General Hospital of Nanjing Military Command) between January 2018 and December 2025. Key efficacy outcomes include progression-free survival (PFS), overall survival (OS), objective response rate (ORR), and clinical benefit rate (CBR). Safety outcomes include the incidence of grade 3/4 adverse events and serious adverse events. Subgroup analyses will compare different post-ADC regimens (e.g., alternative ADC, chemotherapy, endocrine therapy, immunotherapy) and explore the impact of visceral metastasis and prior ADC treatment response on subsequent outcomes. This study seeks to identify optimal post-ADC treatment strategies and preferred patient populations for clinical benefit.

Studieöversikt

Status

Avslutad

Betingelser

Bröstcancer

Studietyp

Observationell

Inskrivning (Faktisk)

220

Kontakter och platser

Det här avsnittet innehåller kontaktuppgifter för dem som genomför studien och information om var denna studie genomförs.

Studieorter

Kina
- Jiangsu
  - Nanjing, Jiangsu, Kina, 210029
    - The First Affiliated Hospital with Nanjing Medical University

Deltagandekriterier

Forskare letar efter personer som passar en viss beskrivning, så kallade behörighetskriterier. Några exempel på dessa kriterier är en persons allmänna hälsotillstånd eller tidigare behandlingar.

Urvalskriterier

Åldrar som är berättigade till studier

Vuxen
Äldre vuxen

Tar emot friska volontärer

Nej

Testmetod

Sannolikhetsprov

Studera befolkning

Patients with histologically confirmed HER2-low advanced or metastatic breast cancer who received antibody-drug conjugate (ADC) therapy in the advanced setting and subsequently experienced disease progression.

Beskrivning

Inclusion Criteria:

females aged ≥18 years.
confirmed pathologic diagnosis of HER2-low MBC (defined as HER2 IHC 1+ or 2+ without gene amplification by FISH detection).
patients had disease progression following ADC treatment in advanced setting and had undergone at least one available efficacy evaluation.
patients received at least one subsequent anti-tumor treatment following ADC failure, with at least one available efficacy evaluation.

Exclusion Criteria:

patients previously treated with ADC during neoadjuvant or adjuvant setting.
patients who had not experienced disease progression on their first ADC (ADC1) regimen and remained on ADC1 treatment.
patients with no documented subsequent anti-tumor therapy following ADC1 treatment.
patients who lacked evaluable efficacy assessment data during ADC1 or post-ADC therapy.
patients with incomplete clinicopathological information.

Studieplan

Det här avsnittet ger detaljer om studieplanen, inklusive hur studien är utformad och vad studien mäter.

Hur är studien utformad?

Designdetaljer

Vad mäter studien?

Primära resultatmått

Resultatmått	Åtgärdsbeskrivning	Tidsram
real-world (rwPFS) of post-ADC therapy Tidsram: up to 12 months.	the duration from the post-ADC treatment initiation to either disease progression or death from any cause, whichever came first	up to 12 months.

Sekundära resultatmått

Resultatmått	Åtgärdsbeskrivning	Tidsram
objective response rate (ORR) Tidsram: at 12 weeks	ORR was defined as the percentage of patients achieving a best overall response of complete response (CR) or partial response (PR).	at 12 weeks
Clinical benefit rate (CBR) of post-ADC therapy Tidsram: at 12 weeks	CBR was determined by the percentage of patients achieving disease control, defined as complete response (CR), partial response (PR), or stable disease (SD).	at 12 weeks
overall survival (OS) of post-ADC therapy Tidsram: up to 24 months	Overall survival was defined as the duration from post-ADC treatment initiation to death from any cause.	up to 24 months

Samarbetspartners och utredare

Det är här du hittar personer och organisationer som är involverade i denna studie.

Sponsor

The First Affiliated Hospital with Nanjing Medical University

Studieavstämningsdatum

Dessa datum spårar framstegen för inlämningar av studieposter och sammanfattande resultat till ClinicalTrials.gov. Studieposter och rapporterade resultat granskas av National Library of Medicine (NLM) för att säkerställa att de uppfyller specifika kvalitetskontrollstandarder innan de publiceras på den offentliga webbplatsen.

Studera stora datum

Studiestart (Faktisk)

1 mars 2018

Primärt slutförande (Faktisk)

31 december 2025

Avslutad studie (Faktisk)