The APIS ESR1 Mutations Kit is an advanced qPCR assay for the sensitive and precise detection of mutations within the oestrogen receptor gene. The ESR1 Mutations Kit is a qualitative test, detecting eleven ESR1 mutations across three exons: exon 5 (E380Q), exon 7 (S463P) and exon 8 (P535H, L536R, L536Q, L536H, L536P, Y537C, Y537S, Y537N and D538G).