PPP1R14D and cancer: In conclusion, our results indicate that in certain cancer cell lines where phosphorylated CPI-17 or its related proteins (PHI-1, KEPI, or GBPI-1) are not detected, proteins with a molecular mass of 40–220 kDa range are phosphorylated in CPI-17-like sequences that are cross-reactive with anti-CPI-17pThr38.