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O29 - Cancer Control & Epidemiology IV (ID 132)
- Event: WCLC 2013
- Type: Oral Abstract Session
- Track: Prevention & Epidemiology
- Presentations: 1
O29.04 - A new medical device for in vivo isolation of circulating tumor cells in non-small cell lung cancer (NSCLC) patients and immunofluorescence identification of ALK (ID 2659)
10:30 - 12:00 | Author(s): S. Herold
Circulating tumor cells (CTCs) in the bloodstream of lung cancer patients provide a source for early detection, prognosis, and therapy monitoring. CTCs are currently mostly isolated in vitro from small volumes of patient blood samples. In order to increase the sensitivity of the CTC detection in the peripheral blood GILUPI has developed a novel in vivo method, the CellCollector, which enables the capture of CTCs from the patient´s blood stream with a higher sensitivity and efficacy than existing methods. Enumeration and characterization of those CTCs will serve to improve and monitor clinical cancer early detection and treatment. The aim of this study was to assess the Detektor CANCER01 (DC01) for in vivo isolation of CTCs directly from the blood of NSCLC patients, and to compare it to the CellSearch® method.
The device was inserted in a cubital vein through a standard cannula for thirty minutes. The interaction of target CTCs with the DC01 was mediated by an antibody directed against the epithelial cell adhesion molecule (EpCAM). To confirm the CTCs binding to the wire, the immunohistochemical staining against EpCAM and/ or Cytokeratins as well as CD45 for negative cell selection and nuclei counterstaining was performed. There were enumeration data available for 34 stage I-IIIB NSCLC patients and 8 non cancer patients. For 34 patients, samples were also tested with the CellSearch® method.
In this study, we successfully isolated EpCAM-positive tumor cells in the peripheral blood originating from NSCLC patients. We obtained in vivo CTC detection rate of 94% in 32 of 34 NSCLC patients with a median (range) of 13 (0-300) CTCs. In 2 of 34 samples (5.8 %), CTCs were detected by the CellSearch® method. In all matched pairs, the DC01detected the same number or more CTCs compared to the CellSearch® method. The sensitivity was similar for early and late stage NSCLC patients. In the non-cancer patients, no CTCs were detected (100 % specificity). ALK gene rearrangements in NSCLC patients are an indication for targeted therapy with crizotinib. Therefore the staining for CTCs on the CellCollector was enhanced to identify the anaplastic lymphoma kinase (ALK). It could be identified by capturing cells and immunohistochemical staining.
Due to a detection rate of over 90% this new device might overcome present limitations in the enrichment of CTCs. This proof of concept study may have important clinical implications, as the implementation of the device into clinical practice may improve early detection, prognosis and therapy monitoring of NSCLC patients. The performed IHC for ALK expression on samples using a novel combination of a new ALK antibody with the high detection rate of the CellCollector offers an alternative to FISH or IHC on tumor tissue. This new technology also allows, as the captured tumor cells are ready using immunofluorescence approaches or qPCR, the possibility of establishing more personalized treatment regiments.
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