Precise Therapy for Refractory HER2 Positive Advanced Breast Cancer

This is an open, prospective and interventional clinical study. Patients with advanced Human Epidermal Growth Factor Receptor 2 (HER2) positive breast cancer resistant to trastuzumab will be enrolled in the study. Histological specimens obtained from different metastatic foci of patients, are used to conduct genome-wide sequencing together with Circulating tumor DNA (ctDNA) of blood samples. Meanwhile, investigator will construct PDO model based on biopsy tissue. Patients as well as their paired Patient-derived organoids (PDO) models are divided into six groups according to genomic signatures. Each group of patients will receive the best targeted treatment scheme from the current clinical perspective, while the matched PDO model will accept a variety of potential effective schemes intervention. The future treatment plan of patients will be timely adjusted based on the tumor inhibition rate of PDO models. This study is the first time to explore the best individualized application sequence of targeted therapy for refractory HER2 positive breast cancer by combining genome sequencing with drug sensitivity test of PDO model. The results are expected to improve the prognosis of patients with advanced HER2 positive breast cancer.

Sex

Female

Minimum age

18 Years

Maximum age

70 Years

Inclusion Criteria:

1. 18-70 years old;
2. Women;
3. ECOG score 0-2;
4. Locally advanced or metastatic breast cancer confirmed by histopathology;
5. Positive HER2 expression in cancer tissues (IHC 3 +, or IHC 2 + but FISH amplification);
6. Resistant to trastuzumab (including disease progression during or after withdrawal of trastuzumab);
7. There were enough specimens for immunohistochemistry, gene detection and establishment of PDO model;
8. Hematology and liver and kidney function were normal within 2 weeks before treatment;
9. Imaging examination showed measurable lesions (according to RECIST v1.1);
10. Women of childbearing age agree to contraception or take contraceptive measures;
11. Be able to understand the research program and participate voluntarily.

Exclusion Criteria:

1. Symptomatic, untreated or progressive central nervous system metastases;
2. Severe heart disease (poor cardiac function);
3. Within 5 years, there was a history of other malignant tumors other than breast cancer;
4. In this study, chemotherapy, radiotherapy, immunotherapy or surgery were performed within 3 weeks before the first treatment;
5. Patients who are pregnant or lactating, or plan to become pregnant during enrollment.