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Frequency of MTX‐LPD cases per total hematopoietic and lymphoid tissue neoplasm cases from 2007‐2014. The frequency of MTX‐LPD cases was 0.11%, 0.18%, 0.40%, 0.35%, 0.58%, 0.63%, 0.94%, and 1.6% in 2011‐2014, respectively. MTX‐LPD: methotrexate‐associated lymphoproliferative disorder
