PLAUR and neoplasm: The population of CD87+ cells contains a subpopulation of CSC, has the ability to form spheres and possesses an increased potential for initiating tumor growth, as well as a significant resistance to numerous traditional chemotherapeutic agents intended for the treatment of patients with SCLC (Ginestier et al., 2007; Ginestier et al., 2007; Huang et al., 2009; Jiang et al., 2009; Okudela et al., 2013; MacDonagh et al., 2017).