Other stratification factors were used in literature: performance status [10, 13, 22, 24], primary tumor localization (head vs body or tail) [10], albumin [22], time since receiving most recent anticancer therapy [22], tumor stage at diagnosis [22], baseline CA19-9 [15, 22, 24] number of metastatic sites [15], peritoneal carcinomatosis [15], CRP>5mg/dL [24]. The gene discussed is CRP; the disease is neoplasm.