The IDESR1+ kit is a system for detecting mutations in :
exon 4 (K303R), exon 5 (E380Q), exon 6 (V422del), exon 7 (S463P) and exon 8 (L536H, L536P, L536R, L536Q, L536F, Y537S, Y537C, Y537N, Y537D, Y537H, D538G) of the ESR1 (EStrogen Receptor 1) gene.