Produced in CHO cell cultures, trastuzumab is a recombinant IgG1 kappa, humanized monoclonal antibody that selectively binds with high affinity in a cell-based assay (Kd = 5 nM) to the extracellular domain of the human epidermal growth factor receptor protein (HER2). It is used as a treatment of human epidermal growth factor receptor (HER)-2+ metastatic breast cancer, where there is a proven amplification of the HER-2 oncogene or over-expression of the HER-2 protein in tumours. It is suggested that the overexpression or gene amplification of HER2 has been found in about 20–30% of breast cancers and elevated activation of HER2 triggers multiple downstream pathways leading to abnormal proliferation of cancer cells . Trastuzumab binds to HER2 and suppresses cancer cell growth, proliferation, and survival directly and indirectly .
In December 2017, FDA approved OGIVRI (trastuzumab-dkst) as a biosimilar to Herceptin (trastuzumab) for the treatment of patients with breast or metastatic stomach cancer (gastric or gastroesophageal junction adenocarcinoma) whose tumors overexpress the HER2 gene (HER2+). It displays biosimilar properties as Herceptin according to clinical data. While Ogivri is the first biosimilar approved in the U.S. for the treatment of breast cancer or stomach cancer, it is the second biosimilar approved in the U.S. for the treatment of cancer. Herzuma (trastuzumab-pkrb) is a biosimilar drug approved in December 2018 for the treatment of HER2-overexpressing breast cancer. KANJINTI (trastuzumab-anns) is another biosimilar approved by the FDA in June 2019. ONTRUZANT, another biosimilar of Herceptin, was approved by Health Canada in February 2022.
For the adjuvant treatment of HER2-overexpressing breast cancer, trastuzumab is indicated in several clinical settings: as part of a treatment regimen consisting of doxorubicin, cyclophosphamide, and either paclitaxel or docetaxel; as part of a treatment regimen with docetaxel and carboplatin; or as monotherapy following multi-modality anthracycline-based therapy.
Trastuzumab is indicated as a first-line treatment, in combination with paclitaxel, for metastatic HER2-overexpressing breast cancer, and as monotherapy in patients who have previously received one or more chemotherapy regimens in the metastatic setting.
Trastuzumab is also indicated, in combination with cisplatin and capecitabine or 5-fluorouracil, for the treatment of patients with HER2-overexpressing metastatic gastric or gastroesophageal junction adenocarcinoma who have not received prior treatment for metastatic disease.
Trastuzumab is indicated for subcutaneous administration - in combination with either hyaluronidase or both hyaluronidase and pertuzumab - for the treatment of adults with HER2-positive breast cancers.
Cedars-Sinai Medical Center, Los Angeles, California, United States
Memorial Sloan Kettering Cancer Center (All Protocol Activities), New York, New York, United States
Memorial Sloan Kettering Bergen (Limited Protocol Activities), Montvale, New Jersey, United States
Memorial Sloan Kettering Commack (Limited Protocol Activities), Commack, New York, United States
University of Chicago Medical Center, Chicago, Illinois, United States
Comprehensive Cancer Centers of Nevada, Las Vegas, Nevada, United States
Duke University Medical Center, Durham, North Carolina, United States
University of Chicago Medical Center, Chicago, Illinois, United States
Duke University Medical Center, Durham, North Carolina, United States
National Cancer Center Hospital, Chuo-ku, Other, Japan
Beth Israel Deaconess Medical Center, Boston, Massachusetts, United States
MD Anderson Cancer Center, Houston, Texas, United States
Dana-Farber Brigham Cancer Center - Foxborough, Foxboro, Massachusetts, United States
University of Rochester Medical Center, Rochester, New York, United States
Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, Shanghai, China
Research Site, Sutton, United Kingdom
Second Affiliated Hospital, Zhejiang University, School of Medicine, Hangzhou, Zhejiang, China
Sun Yat-sen University Cancer Center, Guangzhou, Guangdong, China
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