Conversely, others reported a hypercoagulable ROTEM profile in polycythaemia vera (Şahin et al., 2021); however, those patients with polycythaemia vera exhibited lower haematocrit or [Hb] levels than those in the present study, and factors other than haematocrit are implicated in the prothrombotic tendency associated with polycythaemia vera (Gangaraju et al., 2020; Kroll et al., 2015). Here, GSTM1 is linked to acquired polycythemia vera.