Overall, a tumour was found in 9/20 (45%) of the ITPR1/anti-Sj-seropositive patients with available data (3 × breast, 1 × breast and endometrial, 3 × lung [including non-small lung cancer/adenocarcinoma in 2, not specified in 1], 1 × renal, 1 × multiple myeloma) [1, 16, 18, 26, 27]. This evidence concerns the gene ITPR1 and plasma cell myeloma.