Dược động học quần thể của trastuzumab emtansine (T-DM1), một conjugate kháng thể - thuốc nhắm vào HER2, ở bệnh nhân ung thư vú di căn HER2 dương tính: ý nghĩa lâm sàng của ảnh hưởng các yếu tố đồng quy

Cancer Chemotherapy and Pharmacology - Tập 74 - Trang 399-410 - 2014
Dan Lu1, Sandhya Girish1, Yuying Gao2, Bei Wang1, Joo-Hee Yi3, Ellie Guardino1, Meghna Samant4, Melody Cobleigh5, Mothaffar Rimawi6, Pierfranco Conte7, Jin Yan Jin1
1Department of Clinical Pharmacology, Genentech, Inc, South San Francisco, USA
2Drug Development Consulting Services, Quantitative Solutions, Menlo Park, USA
3BioAnalytical Sciences, Genentech Inc., South San Francisco, USA
4Biostatistics, Genentech, Inc, South San Francisco, USA
5Department of Internal Medicine, Rush University Medical Center, Chicago, USA
6Lester and Sue Smith Breast Center, Baylor College of Medicine, Houston, USA
7Department of Surgery, Oncology and Gastroenterology, University of Padua, Padua, Italy

Tóm tắt

Trastuzumab emtansine (T-DM1) là một conjugate kháng thể - thuốc bao gồm kháng thể đơn dòng human hóa trastuzumab liên kết với DM1, một tác nhân độc tế bào có hoạt tính cao. Một phân tích dược động học quần thể (PK) đã được thực hiện để ước lượng các giá trị điển hình và biến thiên giữa các cá nhân của các tham số PK T-DM1 và ảnh hưởng của các yếu tố đồng quy có liên quan lâm sàng. Mẫu huyết thanh đã được thu thập từ 671 bệnh nhân mắc bệnh ung thư vú (MBC) di căn hoặc tiến triển tại chỗ có thụ thể yếu tố tăng trưởng biểu bì người 2 (HER2) dương tính, người đã nhận T-DM1 như một liệu pháp đơn trị trong năm nghiên cứu từ giai đoạn I đến giai đoạn III. Phân tích mô hình hỗn hợp phi tuyến tính với phương pháp ước lượng điều kiện bậc nhất đã được sử dụng. Một mô hình hai buồng tuyến tính với sự loại bỏ bậc nhất từ buồng trung tâm đã mô tả PK T-DM1 trong dải liều lâm sàng. Độ thanh thải loại bỏ T-DM1 là 0.676 L/ngày, thể tích phân bố ở buồng trung tâm (Vc) là 3.127 L, và thời gian bán hủy loại bỏ cuối cùng là 3.94 ngày. Tuổi, chủng tộc, vùng và chức năng thận không ảnh hưởng đến PK T-DM1. Với hiệu ứng thấp đến trung bình của tất cả các yếu tố đồng quy có ý nghĩa thống kê lên sự tiếp xúc với T-DM1, không yếu tố nào trong số này được dự kiến sẽ gây ra thay đổi có ý nghĩa lâm sàng trong việc tiếp xúc với T-DM1. Các đặc tính PK của T-DM1 là đồng nhất và có thể dự đoán ở bệnh nhân. Việc điều chỉnh liều dựa trên các yếu tố đồng quy ban đầu khác ngoài trọng lượng cơ thể cho phác đồ hiện tại 3.6 mg/kg sẽ không mang lại sự giảm thiểu có ý nghĩa lâm sàng trong biến thiên PK giữa các cá nhân ở bệnh nhân MBC.

Từ khóa

#Trastuzumab emtansine #dược động học quần thể #HER2 #ung thư vú di căn #yếu tố đồng quy

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