Details

Autor(en) / Beteiligte

• Chumsri, Saranya
• Weidler, Jodi
• Ali, Siraj
• Balasubramanian, Sohail
• Wallweber, Gerald
• DeFazio-Eli, Lisa
• Chenna, Ahmed
• Huang, Weidong
• DeRidder, Angela
• Goicocheal, Lindsay
• Perez, Edith A

Titel

Prolonged Response to Trastuzumab in a Patient With HER2-Nonamplified Breast Cancer With Elevated HER2 Dimerization Harboring an ERBB2 S310F Mutation

Ist Teil von

• Journal of the National Comprehensive Cancer Network, 2015-09, Vol.13 (9), p.1066-1070

Ort / Verlag

United States

Erscheinungsjahr

2015

Quelle

MEDLINE

Beschreibungen/Notizen

• In the current genomic era, increasing evidence demonstrates that approximately 2% of HER2-negative breast cancers, by current standard testings, harbor activating mutations of ERBB2. However, whether patients with HER2-negative breast cancer with activating mutations of ERBB2 also experience response to anti-HER2 therapies remains unclear. This case report describes a patient with HER2-nonamplified heavily pretreated breast cancer who experienced prolonged response to trastuzumab in combination with pertuzumab and fulvestrant. Further molecular analysis demonstrated that her tumors had an elevated HER2 dimerization that corresponded to ERBB2 S310F mutation. Located in the extracellular domain of the HER2 protein, this mutation was reported to promote noncovalent dimerization that results in the activation of the downstream signaling pathways. This case highlights the fact that HER2-targeted therapy may be valuable in patients harboring an ERBB2 S310F mutation.