EGFR and breast neoplasm: For example, the length of a polymorphic [GT/CA] allele within intron one of the EGFR gene is inversely correlated with transcription (Gebhardt et al. 1999), and EGFR expression is increased in breast tumors with [GT/CA]15 alleles, relative to tumors with [GT/CA]18 alleles (Buerger et al. 2000, 2004).