Assessment of the expression levels of these phosphatases in all 183 patients with MDS, or in the 135 RA and RAEB patient subset, revealed a trend toward anticorrelation between the expression of PTEN and INPP5D (SHIP1), while PTEN and INPP4B expression appear to be positively correlated (fig. This evidence concerns the gene INPP5D and myelodysplastic syndrome.