PTEN and myelodysplastic syndrome: In addition, to better understand the possible correlation between PTEN, INPP4B, and SHIP1 expression in MDS patient CD34+ cells, we performed Spearman rank correlation analysis, comparing all of the probes associated with PTEN, INPP4B, and INPP5D (SHIP1) in the MDS microarray dataset GSE 19429.