I suppose a similar device will be developed for those who become tired of repeatedly entering their digital signatures for validation.
Differential mRNA abundance analysis of 36-gene signature for the validation cohort.
(b) US Geological Survey mineral spectral signatures used for validation purposes.
(a) False color composition and (b) U.S. Geological Survey mineral spectral signatures used for validation purposes.
Because almost all public cancer signatures have only been validated using a few test datasets, a practical question is how to select additional valid datasets for signature validation.
The resultant 296 probesets, whose differential expression between SCC and AC shows the most stability, are robust candidates for signature validation.
This database has been suggested to be a model for development of predictive signatures of toxicity and for validation of the U.S. EPA's ToxCast research program (Martin et al. 2009).
From each group of migratory and stationary signatures genes were selected for validation by quantitative RT-PCR because they exhibited 1.5-fold or greater differential expression between rim and core in a majority of the cell lines and are annotated as being engaged in cancer, migration, and/or invasion (literature mining).
For signature external validation, CEL files were downloaded from GEO GSE18571, which contains gene expression data for both in vitro and in vivo rapamycin treatment samples on TNBC cell line MDA-MB-468 [ 26], and from Connectivity Map batches 2, 35, 44, 56, 63, 70, 626, 757 and 767, and analyzed as described by Cohen et al. [ 49].
However, the establishment of a reliable gene expression signature for ESFT and the validation of robustly EWS/FLI1-regulated genes require the analysis of large cohorts of primary tumors from untreated patients on a single analysis platform.
