Summary of SAGE libraries generated and tags sequenced.

BE, bronchial epithelial; Precancer (squamous metaplasia, squamous dysplasia); CIS, carcinoma-in-situ; SCC, invasive squamous cell carcinoma.
1Unique tags are defined by the 10 nucleotide long sequence, and represent the maximum number of unique transcripts within the respective SAGE dataset.
2Exclusion of singletons; singleton is defined as sequence tags having a raw tag count of one within an individual dataset (comprised of multiple libraries as indicated).
3BE libraries were generated in previous studies [19], [37].