The existence of the predominant ASV Δ8 in the full-length HNF1B alternative transcript form (HNF1BΔ8; including canonical exon 3 variant) was proven by the sequencing analysis of the cloned transcript, isolated from the non-tumour ovary tissue during the method optimization steps (as described in the Materials and Methods section). The gene discussed is HNF1B; the disease is neoplasm.