Some aneuploid tumours (15, 17, 19, 21, 22, and 27T) grouped together in a sub-cluster, with increased expression of HRAS, KRAS, NRAS, TP53 and EGFR. A mixed cluster of tumour and neighbouring mucosal samples (normal green: 9, 10, 23, 24; tumour red: 3, 10, 12, 24) revealed higher expression of tumour markers, cytokeratins and casein kinases. The gene discussed is KRAS; the disease is neoplasm.