Saowapa S.Pangkanon W.Adu Y.Chaisrimaneepan N.Bernal D.O.Polpichai N.Siladech P.Sekhon J.Mahidol University2024-04-302024-04-302024-01-01European Journal of Case Reports in Internal Medicine Vol.11 No.4 (2024)https://repository.li.mahidol.ac.th/handle/20.500.14594/98172Chronic lymphocytic leukaemia (CLL) is a lymphoproliferative disorder characterised by an accumulation of monoclonal B lymphocytes, with an increased risk of secondary cancers. The coexistence of CLL and chronic myeloid leukaemia (CML) is a rare phenomenon, with three main types being classified: CML preceding CLL, CLL preceding CML and simultaneous occurrence. The coexistence of these chronic leukaemias poses a complex clinical challenge, with the underlying mechanisms of their association remaining enigmatic. Here, we present a report of an elderly male with a long history of CLL, who was subsequently diagnosed with secondary CML.MedicineArticleSCOPUS10.12890/2024_0042972-s2.0-8519089899222842594