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Langenhagen, Germany

Kuhlmann J.D.,University of Duisburg - Essen | Kuhlmann J.D.,TU Dresden | Kuhlmann J.D.,German Cancer Research Center | Wimberger P.,University of Duisburg - Essen | And 16 more authors.
Clinical Chemistry | Year: 2014

BACKGROUND: Platinum resistance constitutes one of the most recognized clinical challenges for ovarian cancer. Notably, the detection of the primary tumor-based excision repair cross-complementation group 1 (ERCC1) protein by immunohistochemistry was recently shown to be inaccurate for the prediction of platinum resistance. On the basis of the previous finding that circulating tumor cells (CTC) in the blood of ovarian cancer patients are prognostically significant, and given our hypothesis that the negative prognostic impact of CTC may arise from a cellular phenotype associated with platinum resistance, we asked whether expression of the excision repair cross-complementation group 1 (ERCC1) gene in the form of the ERCC1 transcript in CTC may be a suitable blood-based biomarker for platinum resistance. METHODS: The presence of CTC was analyzed by immunomagnetic CTC enrichment (n = 143 patients) targeting the epithelial epitopes epithelial cell adhesion molecule (EPCAM) (also known as GA733-2) and mucin 1, cell surface associated (MUC1), followed by multiplex reverse-transcription PCR to detect the transcripts EPCAM, MUC1, and mucin 16, cell surface associated (MUC16) (also known as CA125), including ERCC1 transcripts in a separate approach. ERCC1 expression in primary tumors was comparatively assessed by immunohistochemistry, using the antibody 8F1. RESULTS: At primary diagnosis, the presence of CTC was observed in 14% of patients and constituted an independent predictor of overall survival (OS) (P = 0.041). ERCC1-positive CTC (ERCC1+CTC) were observed in 8% of patients and constituted an independent predictor, not only for OS but also for progression-free survival (PFS) (P = 0.026 and P = 0.009, respectively). More interestingly, we discovered the presence of ERCC1+CTC at primary diagnosis to be likewise an independent predictor of platinum resistance (P = 0.010), whereas ERCC1 expression in corresponding primary tumor tissue predicted neither platinum resistance nor prognosis. CONCLUSIONS: The presence of ERCC1+CTC can serve as a blood-based diagnostic biomarker for predicting platinum resistance at primary diagnosis of ovarian cancer. © 2014 American Association for Clinical Chemistry. Source

Adnagen Inc. | Entity website

Adnagen Inc. | Entity website

The present invention concerns a monoclonal antibody and corresponding hybridoma cells and antigens suitable for isolating fetal cells from maternal blood. The inventive monoclonal antibody reacts with a surface antigen present on fetal red blood cells including their nucleated precursor cells, but not with surface antigens on adult erythroid cell.

Adnagen Inc. | Entity website

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