Swarts et al., previously analysed the expression of OTP by qRT-PCR on frozen material of carcinoids, LCNEC, SCLC, normal tissues, and neuroendocrine cell lines (Bon-1, CM, NCI-H69, NCI-H295, NCI-H460, NCI-H720, NCI-H727, QGP and SW13). The gene discussed is OTP; the disease is carcinoid tumor.