"Colorectal cancer cell lines identified VACO6 cells as a carrier of a canonical PTPRK(e1)-RSPO3(e2) fusion; cell line displayed marked in vitro and in vivo sensitivity to WNT blockade by the porcupine inhibitor LGK974. Long-term treatment of VACO6 cells with LGK974 led to the emergence of a resistant population carrying two frameshift deletions of the WNT pathway inhibitor AXIN1 with consequent protein loss."xsd:string