Similar to the DotScan method, however, our antibody array can also be multiplexed to analyze primary tumor samples containing multiple subpopulations that can be recognized by fluorescently conjugated antibodies (e.g. epithelial tumor cells with CEA-FITC and hematopoietic cells with CD45-APC) while the antibodies in the array are labeled with Alexa647. This evidence concerns the gene PTPRC and neoplasm.