GAS6 and acute myeloid leukemia: Unlike the expression of Axl and Mer, Gas6 expression is low in AML cells, similar to the situation in healthy haematopoietic cells.75 In contrast, Gas6 is abundant in AML bone marrow (BM) stromal cells with a fibroblastic/mesenchymal morphology (referred to as BMDSCs), whereas its expression is lower in control BMDSCs.75 Therefore, the mechanism of Gas6/TAM overexpression in acute leukaemia remains unclear.