◎文/藥師盧雅紋
註1:Grades based on National Cancer Institute Common Terminology
Criteria for Adverse Events Version 4.03
註2:Tucatinib階梯式劑量降階建議
縮寫:ULN = upper limit of normal; ALT = alanine aminotransferase; AST
= aspartate aminotransferase
(續)藥物介紹:
二、Trastuzumab deruxtecan (Enhertu)
Trastuzumab deruxtecan是抗體藥物複合體(ADC)由三個部分所組成,由人源化抗HER2
之IgG1單株抗體(monoclonal Antibody, mAb), 以共價鍵結合至topoisomerase I 抑制劑(DXd),透過四胜肽可裂解連接子共鍵結到DXd。抗體部份則是以DNA重組技術,每個抗體分子連接約8個deruxtecan分子。
在2023年ASCO年會上發表DESTINY-CRC02第二期研究,比較Enhertu 5.4 mg/kg的劑量治療HER2陽性的mCRC病人,相較於6.4
mg/kg。研究結果得知,無論是RAS野生型或RAS突變型,支持以5.4 mg/kg劑量靜脈注射trastuzumab
deruxtecan,每3週一次,作為HER2陽性mCRC病人的最佳劑量。
cORR: confirmed objective response rate; DOR: duration of response;
DCR: disease control rate; PFS: progression-free survival; OS:
overall survival
參考資料:
1. Ivanova M, Venetis K, Guerini-Rocco E, et al. HER2 in Metastatic
Colorectal Cancer: Pathology, Somatic Alterations, and Perspectives
for Novel Therapeutic Schemes. Life (Basel). 2022;12(9):1403.
2. Sheffels E, Kortum RL. The Role of Wild-Type RAS in Oncogenic RAS
Transformation. Genes (Basel). 2021;12(5):662.
3. Fraga T, de Sousa MJ, Magalhães J, et al. HER2 Status in RAS and
BRAF Wild-Type Metastatic Colorectal Cancer: A Portuguese Study.
Cureus. 2023;15(7):e42536.
4. Raghav K, Siena S, Takashima A, et al. Trastuzumab deruxtecan
(T-DXd) in patients (pts) with HER2-overexpressing/amplified (HER2+)
metastatic colorectal cancer (mCRC): primary results from the
multicenter, randomized, phase 2 DESTINY-CRC02 study. J Clin Oncol.
2023;41(suppl 16):3501. doi:10.1200/JCO.2023.41.16_suppl.3501
5.Tukysa package leaflet
6.Enhertu package leaflet
(全文完)
(本文作者為衛生福利部臺中醫院臨床藥師/倫敦大學臨床藥學碩士)
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