MMP1 and neoplasm: Consistently, the retarded fat body cell dissociation caused by Mmp1 or Mmp2 RNAi could be regulated by modulating the expression of foi. Further, by using Drosophila models of malignant tumour RafGOFscrib−/− and RasV12lgl−/−, we showed that the tumour growth, invasion and migration could be markedly inhibited by foi knockdown.