The 30 antibodies (with CD31 and PDGFRα pooled in the same channel) were grouped into 4 subpanels (Supplementary Table 1 and ‘Methods’ section): (a) human tumour compartment (HTC, n = 11); (b) mouse stroma compartment (MSC, n = 7); (c) oncogenic signalling activation (OSA, n = 10); and (d) cell cycle and apoptosis (CCA, n = 5). Here, PECAM1 is linked to neoplasm.