Taking advantage of the specificity of primer pair 2 and primer pair 3, we thus aimed at investigating in a pilot study the prognostic value of ZNF217-WT (E3-E4) and ZNF217-ΔE4 (E3-E5) mRNA expression levels, alone or in combination, in the molecular subtypes of breast cancer. The gene discussed is ZNF217; the disease is breast cancer.