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Les progrès de la biologie moléculaire ont permis la caractérisation des principales voies de signalisation et ont mis en évidence l'implication majeure de la signalisation cellulaire dans les processus de cancérogenèse. Des cibles moléculaires ont ainsi été identifiées et ont permis le développement de thérapeutiques dites ciblées, telles que les anticorps monoclonaux ou encore les inhibiteurs de kinase. Malgré ces avancées considérables qui ont permis l'amélioration de la prise en charge des patientes, on constate l'apparition de résistances aux traitements. Ce travail avait pour objectifs d'identifier de nouveaux biomarqueurs et de déterminer leur signification clinique ,
, Dans un premier temps nous avons étudié les mutations activatrices du gène PIK3CA. Ces mutations sont retrouvées dans 25% des cancers du sein et sont impliquées dans la résistance au trastuzumab, aux anti-oestrogènes et aux inhibiteurs de mTOR
, Les résultats des 2 techniques étaient concordants (?=0,845 ; p<0,001) et une relation entre mutations du gène PIK3CA et grade SBR a été mise en évidence, les tumeurs de grade SBR III étant moins fréquemment mutées que les autres, échantillons de tumeurs de sein infiltrantes ont été analysés par une technique de PCR-HRM
/2 (p=0.003) et p-P38MAPK (p<0.001) dans le bras de traitement associant l'évérolimus au trastuzumab qui pourrait s'expliquer par la suppression par l'évérolimus d'une boucle de rétrocontrôle négatif contrôlant l'activation de la voie RAS/RAF/MAPKinases. Dans le bras de traitement évaluant le trastuzumab seul, aucune variation du niveau d'expression des phosphoprotéines n'a été mise en évidence, y compris en aval du récepteur HER2, ce qui soulève l'hypothèse d'un mécanisme d'action prédominant immunologique du trastuzumab, Pour cela nous avons analysé le niveau d'expression des phosphoprotéines p-AKT, p-GSK3?, p-S6 kinase, vol.2, p.1 ,
Advances in molecular biology have allowed the characterization of the major signaling pathways and revealed their major implication in carcinogenesis processes. Molecular targets have been identified and have enabled the development of targeted therapies, such as monoclonal antibodies, or kinase inhibitors. Despite these considerable advances that have improved the care of patients, emerging of resistance to treatments has been observed. The aim of this work was to identify new tumor biomarkers and determine their clinical significance, ce travail a mis en évidence que la détermination du statut mutationnel du gène PIK3CA et du niveau d' ,
, We analyzed 149 invasive breast tumor samples for PIK3CA gene mutations by PCR-HRM (High Resolution Melting) and 118 by PCR-ARMS (Amplification Refractory Mutation System). The results achieved with the 2 techniques were consistent (? = 0.845; p <0.001) and a relationship between PIK3CA mutations and grade SBR was highlighted with a lower occurrence of mutations in SBR grade III tumors
This part includes 3 studies. The first study was a retrospective study of 45 frozen samples of invasive breast tumors in which we observed that the level of expression of P38 and p-P38 was higher in the ER + tumors. The second study was a prospective study to identify biomarkers of response to trastuzumabeverolimus association in patients with early breast cancer treated preoperatively. This study showed a statistically significant increase of the expression level of p-MEK1 (p = 0.012), p-ERK1/2 (p = 0.003) and p-p38MAPK (p<0.001) in arm treated by trastuzumab associated with everolimus. It could be explained by the repression of a negative feedback loop involving S6K, PI3K and RAS by everolimus, leading to the activation of RAS/RAF/MAPKinases signaling pathway. In the control arm investigating trastuzumab alone, no significant variations of the level of expression of phosphoproteins was demonstrated, raising the hypothesis of the implementation of a predominant immunological mechanism of action for Trastuzumab. The third study that compared effect of trastuzumab in vitro, RAS/RAF/MAPKinases and P38MAPKinase signaling pathways. We have analyzed the expression level of phosphoproteins p-AKT, p-GSK3?, p-S6 kinase, p.90 ,
, As a whole, this work showed that determining the mutation status of PIK3CA and the expression level of phosphoproteins could be useful to refine the molecular characterization of breast cancers and optimize the criteria used to personalize the prescription of targeted therapies