Of the fifty percent of high-grade serous tumours with ≥5% of tumour cells showing membrane FRα expression, 17.3% of tumours showed expression on 5–<25% cells, 4% of tumours on 25–<50% cells and 30.2% of tumours on ≥50% cells (Fig. 3b, bottom left). This evidence concerns the gene FOLR1 and neoplasm.