Incubation of the only cryosections of the adenocarcinoma of patient 1 available for research with a commercial antibody to ITPR1 revealed ITPR1 expression by a subset of cells which was identical to that obtained by incubating the sections with an ITPR1-IgG-positive CSF sample from the same patient (Fig. 7). This evidence concerns the gene ITPR1 and adenocarcinoma.