HSPD1 and cancer: For instance, we found a HSPD1-PNPLA4 chRNA in both KPL-4 and SK-BR-3 libraries: PNPLA4 (GS2) is highly expressed in human SW872 liposarcoma cells [29], while HSPD1, the heat shock protein Hsp60, shows a broad antiapoptotic function in cancer [30].