PSON0007 The effect of two pre-analytical variables (type of collection tube and time to analysis) on the detection and enumeration of Circulating Tumor Cells (CTCs) This study uses immunohistochemistry to detect candidate circulating tumor cells in 90 blood samples from 61 different cancer patients. Collection protocols differ by type of blood collection tube, time to assay, and detection methodology. The dataset includes jpg files of the images of the cells and text files with the cell size and fluorescence intensity, and total cell count per sample. Low pass sequencing on select cells was done, and sequence reads were aligned to the human genome. Derived data for the sequencing and mapping part of this study consists of defined sections of the genome that appear to have comparable sequence coverage.