The present invention demonstrates for the first time that FA Tl plays an important role in modulating PDCD4 expression, which in turn regulates AP-1 dependent transcription, controls processes crucial for migration and invasion in cancer cells, controls induction of a pro -inflammatory micro environment in cancer cells. The study illustrates a link between inflammation and cancer in cells or in a subject. This work highlights the importance of FAT 1 in the induction of the cellular pathways of migration and invasion, proteolysis of the ECM and the expression of pro- inflammatory molecules leading to a favorable micro environment for tumor and cancer progression. The present invention also provides the use of FAT1 in regulating neoplastic phenotypes and genotypes including invasiveness and inflammatory micro environment of the cancer cells by acting as a novel apical regulator of a signaling pathway by affecting the AP1 transcriptional activity, affecting the property of both cell migration and invasion and at the same time affecting the expression of inflammatory modulators. The present invention also identifies a novel regulatory pathway for inflammatory mediators and inflammatory cellular responses via PDCD4 and AP1. The invention describes a pathway for the upregulation of inflammatory processes as such, and hence a means of regulating inflammatory pathologies in general.La présente invention démontre pour la première fois que FAT1 joue un rôle important dans la modulation de lexpression de PDCD4, qui à son tour régule la transcription dépendante dAP-1, commande des procédés cruciaux pour la migration et linvasion dans des cellules cancéreuses, commande linduction dun microenvironnement pro-inflammatoire dans des cellules cancéreuses. Létude illustre une liaison entre linflammation et le cancer dans des cellules ou chez un sujet. Ce travail souligne limportance de FAT1 dans linduction des voies cellulaires de migration et dinvasion, la protéolyse de lECM et lexp
