Medical Subject Heading (MeSH) search strategy with a Boolean approach was employed using the following concepts: ("leukemia, myelogenous, chronic, bcr abl positive/blood"[MeSH Terms] OR "leukemia, myelogenous, chronic, bcr abl positive/complications"[MeSH Terms] OR "leukemia, myelogenous, chronic, bcr abl positive/drug therapy"[MeSH Terms]) AND ("thyroid diseases"[MeSH Terms] OR "thyroid disease"[Text Word]). The gene discussed is BCR; the disease is thyroiditis.