Compared with other cancer types in which the OSNA method has been reported to be helpful for the detection of CK19, such as cervical (14.3–16.0), colorectal (13.3–14.3), endometrial (12.1–14.0), thyroid (11.0–13.3), head and neck (7.8–14.7), and prostate cancer (10.8–12.4), CK19 expression levels in SCLC samples was equivalent. The gene discussed is KRT19; the disease is Familial prostate cancer.