TCF21 and neoplasm: Among the 100 top-ranked discriminative genes for “normal” samples using GA/KNN, only 18 were in common with the top 100 discriminative genes from tumor samples (C11orf9, EMX2, EMX20S, ESR1, FOXF1, FTHL3, GAL3ST1, HAND2, HOXA11, HOXA11AS, HOXA9, IRX5, NACA2, NBLA00301, PA2G4P4, SFTPD, TBX5, and TCF21).