Inclusion Criteria:  Adult subjects aged ≥18 year and up to 75 years Male and females. Initially diagnosed and treated with extramedullary leukemia at KHCC and followed till last encounter. Patients, who underwent an allogeneic stem cell transplant. Period January 2003-September 2019  Exclusion Criteria:  Pediatric patients <18 year of age Patients, who lost their follow up within study period.