Fig. 1.

Quality control of microarray data. The median absolute deviation (MAD) estimates were used as a measure of array data quality. The plot shows the frequency distribution of MAD estimates for microarray data generated from 30 cerebrospinal fluid tumor cell (CSFTC)-samples collected from 13 metastatic breast cancer patients diagnosed with leptomeningeal carcinomatosis. All the samples were considered evaluable since the MAD estimates were < 0.25, which is the threshold chosen for good quality array data.