biostudies-literatureUnknown107(6)Witzel I<h4>Background</h4>We were able to demonstrate a predictive value of serum HER2 (sHER2) in patients receiving trastuzumab in the neoadjuvant GeparQuattro trial. However, the role of sHER2 in patients receiving neoadjuvant therapy (NT) with lapatinib is still unclear.<h4>Methods</h4>The neoadjuvant GeparQuinto trial compared trastuzumab vs lapatinib in addition to chemotherapy in HER2-positive primary breast cancer patients. The sHER2 levels were measured by enzyme-linked immunosorbant assay in 210 patients, of whom 109 (52%) patients received trastuzumab and 101 (48%) lapatinib at three different time points.<h4>Results</h4>Twenty-two percent of patients had elevated baseline sHER2 levels (>15 ng ml⁻¹). A decrease of sHER2 levels (>20%) in the trastuzumab and lapatinib-treated group duringBritish journal of cancer956-60https://www.ebi.ac.uk/biostudies/studies/S-EPMC3464767biostudies-literaturePredictive value of HER2 serum levels in patients treated with lapatinib or trastuzumab -- a translational project in the neoadjuvant GeparQuinto trial.PMC3464767Eidtmann HKarn TZu Eulenburg CIssa-Nummer YWitzel IMeinhold-Heerlein IKhandan FFehm TRack BMuller VFasching PAMau CLiedtke Cvon Minckwitz GLoibl SUntch MHuober JBischoff JHauschild MSchem CSchmatloch SfalsePredictive value of HER2 serum levels in patients treated with lapatinib or trastuzumab -- a translational project in the neoadjuvant GeparQuinto trial.<h4>Background</h4>We were able to demonstrate a predictive value of serum HER2 (sHER2) in patients receiving trastuzumab in the neoadjuvant GeparQuattro trial. However, the role of sHER2 in patients receiving neoadjuvant therapy (NT) with lapatinib is still unclear.<h4>Methods</h4>The neoadjuvant GeparQuinto trial compared trastuzumab vs lapatinib in addition to chemotherapy in HER2-positive primary breast cancer patients. The sHER2 levels were measured by enzyme-linked immunosorbant assay in 210 patients, of whom 109 (52%) patients received trastuzumab and 101 (48%) lapatinib at three different time points.<h4>Results</h4>Twenty-two percent of patients had elevated baseline sHER2 levels (>15 ng ml⁻¹). A decrease of sHER2 levels (>20%) in the trastuzumab and lapatinib-treated group during2012-01-01T00:00:00Z2012 Sep2026-07-15T10:12:43.26Z2026-07-03T03:14:55.461ZS-EPMC34647672289239310.1038/bjc.2012.353