For example, OR8B8 and OR8H1 were exclusively detected in malignant breast epithelial cells, whereas OR1A1 and OR2M3 activation were observed in 11 and 10 different tumor types respectively, suggesting a distinct mode of expression regulation (Fig. 1a, Supplementary Fig. 2a, b; Supplementary Data 2). Here, OR1A1 is linked to neoplasm.