Analyzing the upper of the Stx1 positive triple band of the tumor (T, left panel, inset), most abundant [M3*+Na]+ molecular ions point to the presence of Gb3Cer (d18:1/d18:0, C24:0) with saturated d18:0 sphinganine besides the more common monounsaturated d18:1 sphingosine (sphingenine). This evidence concerns the gene STX1A and neoplasm.