Patients also had no history of chronic pathologies, such as chronic inflammatory bowel disease (Crohn’s disease, ulcerative colitis, etc.), pancreatitis, cirrhosis, chronic obstructive pulmonary disease (COPD), or hypothyroidism, since it has been shown that these types of pathologies may be related to alterations in the basal levels of KRT19 [43,44] and CEA [45,46,47,48,49]. The gene discussed is KRT19; the disease is chronic obstructive pulmonary disease.