Trilaciclib, a CDK4/6 inhibitor, was approved as a myeloprotective agent for extensive-stage small cell lung cancer in 2021. It achieves this by inducing a temporary cell cycle arrest in bone marrow cells. While it has been studied in various cancer types, its potential in haematological cancers remains unexplored. This research aimed to investigate the efficacy of trilaciclib in haematological cancers.