Göksu SS, Bozcuk H, Koral L, Çakar B, Gündüz S, Tatlı AM, Arslan D, Uysal M, Koçer M, Artaç M, Karabulut B, Coşkun HS, Özdoğan M, Savaş B. Factors predicting lapatinib efficacy in HER-2+ metastatic breast carcinoma: Does it work better in different histologic subtypes?
Indian J Cancer 2016;
52:517-9. [PMID:
26960462 DOI:
10.4103/0019-509x.178382]
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Abstract
CONTEXT
Introduction of trastuzumab, a recombinant monoclonal antibody against the extracellular domain of HER-2, is a cornerstone in the treatment of HER-2+ breast carcinoma. However, many cancers that have an initial response to trastuzumab will progress some time later. After progression on trastuzumab-based first-line treatment, there are several options. Although TDM-1 (Trastuzumab emtansine) has prolonged progression-free survival (PFS) and overall survival in patients previously treated with trastuzumab and taxane, it is still not available in Turkey. Patients may be switched to lapatinib (an oral tyrosine kinase inhibitor targeting both HER-1 and HER-2), or they may re-challenge with trastuzumab. There is no clear definition of the patients who should be switched to lapatinib.
AIM
In this study, we investigated the factors predicting the efficacy of lapatinib.
SUBJECTS AND METHODS
Totally, 94 patients treated with lapatinib for metastatic breast carcinoma was included in our study. Retrospective data including pathology, treatments and treatment results, metastatic sites, and laboratory tests were collected.
RESULTS
Progression-free survival was 9.1 months. Histologic subtypes other than invasive ductal carcinoma and liver metastasis were inversely related with PFS. Overall survival was 22.1 months, and patients with histologic subtypes other than invasive ductal carcinoma and who progress with brain metastasis had a worse prognosis.
CONCLUSION
Clinicians should give attention to histologic subtype and metastatic sites when choosing patients for lapatinib treatment.
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