Hormonothrapie cancer de la prostate pdf




















Sa seule utilisation dans le cancer de la prostate est le guidage des biopsies. De plus en plus, linterprtation inclut diffrentes squences dont la squence T2, la diffusion, la restriction ou lhypervascularisation prenant le nom dIRM multiparamtrique.

Actuellement, elle est recommande selon lAFU dans les cancers de prostate de risque intermdiaire et lev pour valuer le sige des tumeurs, linfiltration ou le franchissement de la capsule et lenvahissement des vsicules sminales.

Enfin, lIRM peut mettre en vidence des adnopathies suspectes pelviennes ou des lsions osseuses des os du pelvis. Il peut mettre en vidence des adnopathies pelviennes et rtropritonales ou des lsions osseuses ostocondensantes. Il peut aussi mettre en vidence dautres pathologies tumorales. Sa limite reste sa faible spcificit. Elle doit tre ralise dans le cadre du cancer de prostate de risque intermdiaire et haut risque DAmico. Elle reste infrieure la scintigraphie osseuse pour le diagnostic ou le suivi des mtastases osseuses.

Le PET-Scan nest pas recommand actuellement. Classification TNM grade histopronostique 4. Celui-ci se dveloppe prfrentiellement dans la partie priphrique de la prostate par opposition la zone de transition o se dveloppe lhyperplasie bnigne. Le carcinome neuroendocrine est trs rare, et la forme de sarcome prostatique est exceptionnelle. Le score de Gleason est un score histopronostique caractrisant le degr de diffrenciation de la tumeur, et un facteur pronostique essentiel dans la prise en charge du cancer de prostate.

Il coexiste en fait au sein de la glande prostatique plusieurs foyers tumoraux dvolution diffrente et des stades de diffrenciations pouvant tre diffrents figures 3 - 4 - 5. Le score de Gleason est obtenu en additionnant les 2 grades histologiques allant de 1 5, des cancers les plus reprsents.

Score de 6 : cancer de la prostate bien diffrenci et de bon pronostic exceptionnellement il est. Les scores infrieurs ont t abandonns. Score de 8 10 : cancer de la prostate peu diffrenci, de mauvais pronostic. Ce score est donc bas sur laspect des glandes au sein de la tumeur. Figure 3 : Aspect de glande prostatique selon sa diffrenciation.

Source : Annales de Pathologie, vol. Elsevier Masson SAS. Les marges aprs prostatectomie sont codes comme suit : Rx : non valu R0 : Absence de reliquat tumoral macroscopique ou microscopique R1 : Reliquat microscopique focal ou tendu prciser.

Il est alors prcis sur le compte rendu. Traitements La dcision dun traitement ou dune prise en charge du cancer de la prostate passe obligatoirement par une discussion au cours des runions de concertation pluridisciplinaire runissant urologues, oncologues, radiothrapeutes, radiologues, anatomopathologistes et onco-griatres.

Options thrapeutiques 1 Surveillance active Le principe est bas sur le fait que beaucoup de cancers de la prostate de score de Gleason 6 ou de faible risque de progression selon DAmico ne vont pas progresser ou voluer lentement sans avoir un impact sur la survie du patient. Lindication de la surveillance active est donc un cancer de prostate cliniquement localis et faible risque de progression pour des patients dont lesprance de vie est suprieure 10 ans. Le critre darrt de la surveillance est un temps rapide de doublement du PSA ou lapparition de cancer de grade de Gleason 4 ou 5 sur les biopsies rptes.

Elle comporte : lexrse complte de la prostate et des vsicules sminales lanastomose vsico-urtrale. Elle peut sassocier dun curage ilio-obturateur bilatral, voire dun curage extensif du pelvis pour les cancers de prostate localiss risque intermdiaire ou haut risque. Il existe plusieurs voies dabord chirurgicales : voie ouverte rtropubienne, prinale, laparoscopique ou laparoscopique assiste par robot figure 7.

Aucune voie dabord na fait preuve dune supriorit par rapport une autre en termes de contrle carcinologique. Figure 7 : Intervention par chirurgie robot assist. Source : E. Xylinas, L. Salomon, C. Abbou, A.

Prostatectomie radicale extrapritonale coelioscopique robot-assiste : technique chirurgicale, rsultats oncologiques et fonctionnels. Les effets secondaires de la chirurgie sont : incontinence urinaire : frquente aprs lintervention chirurgicale, elle rgresse dans les semaines. Il convient dajouter les risques lis lanesthsie, de saignement, de transfusion, dinfection et de lsions des organes avoisinants exceptionnelles. Recommandation AFU Le curage ganglionnaire tendu doit tre effectu en cas de risque intermdiaire ou lev si le choix du traitement est la prostatectomie totale.

Il sagit aussi dun traitement curateur. Elle est aujourdhui utilise selon une technique conformationnelle tridimensionnelle, et a pour but de diminuer les effets secondaires lis lirradiation des organes adjacents. Les patients peuvent cependant se plaindre de :. Les contre-indications regroupent les antcdents d'irradiation plevienne antrieure ou de maladie inflammatoire rectale. La radiothrapie peut tre associe une hormonothrapie de courte dure de 6 mois pour les cancers risque intermdiaire ou de longue dure de 3 ans pour les cancers haut risque de progression.

Le plus souvent, il sagit de limplantation de grains diode I Figure 8 : Aspect postcuriethrapie. Lindication ce jour de la curiethrapie est essentiellement pour les patients atteints dun cancer de prostate localis et de faible risque DAmico ayant une esprance de vie de plus de 10 ans.

Les risques sont les mmes que ceux de lirradiation externe. Lindication idale est le traitement des cancers rcidivants localement aprs radiothrapie. Les risques sont les risques lis lanesthsie, de transfusion, dinfection, de stnose, de fistule urtrorectale ou prostato-rectale, dincontinence et de troubles de lrection. La cryothrapie a pour seule indication la rcidive locale aprs radiothrapie.

Peu de centres en France lutilisent. Les risques propres sont les stnoses, lincontinence, les troubles de lrection et la rcidive. La glande prostatique et le cancer de la prostate sont lis la prsence de testostrone, et labsence de cette dernire entrane une apoptose massive des cellules. Dans le cas des cellules tumorales, un contingent est capable de survivre et de se dvelopper en labsence dandrognes et va tre responsable de lvolution pjorative.

Le blocage andrognique a pour but la suppression de leffet des andrognes par suppression de leur production, associe ou non un blocage des rcepteurs priphriques aux andrognes. Son efficacit vaut pendant la priode transitoire pouvant aller de quelques mois plusieurs annes. En moyenne chez le patient mtastatique, lefficacit est de 3 ans. Elle est donc palliative. La suppression andrognique peut tre : chirurgicale par la ralisation dune pulpectomie bilatrale.

Elle est alors dfinitive ; ou mdicale hormonothrapie. Lhormonothrapie mdicale utilise les approches suivantes : les agonistes de la LHRH : ces traitements ont pour but de saturer la voie de la LHRH aboutissant. Il existe un effet rebond linduction du traitement entranant une lvation brutale de la testostronmie avant son effondrement : cet effet est dit flare up ncessitant une co-prescription dun anti-androgne pendant au moins 1 mois.

Ex : anti-andrognes strodiens : actate de cyprotrone Androcur , anti-andrognes non strodiens : bicatulamide Casodex , nicutamide Anandron. Les traitements sont prescrits en continu ou de faon intermittente.

Les effets secondaires sont nombreux, majoritairement lis la baisse de la testostrone figure 10 :. Classiquement, une monothrapie par agoniste ou antagoniste est prescrite en premire ligne mais elle associe en cas dagoniste un anti-androgne chez les patients mtastatiques pour prvenir de leffet FLARE UP 10 jours avant et 1 mois aprs.

Cette hormonosensibilit ne dure cependant quun temps. On parle alors de cancer de prostate en phase de rsistance la castration. Il se dfinit selon plusieurs critres selon les recommandations de lAFU :. Son usage est limit devant un risque faible, mais non ngligeable, thrombo-embolique. De la mme manire, on peut utiliser de lestramustine Estracyt raison de 2 gel. La molcule la plus avance est lactate dabiratrone, inhibiteur de la synthse des andrognes, notamment en inhibant le complexe CYP au sein de la surrnale.

Lactate dabiratrone Zytiga a obtenu lAMM en postchimiothrapie et bientt en pr-chimiothrapie galement , aprs avoir prouv dans une phase 3, un gain en survie globale. Dautres molcules sont en cours de validation : lortronel, ayant un effet abiratrone-like ; MDV, dont laction diffre par son ciblage sur les rcepteurs androgniques directement. Les modalits daction des traitements hormonaux du cancer de la prostate sont rsumes dans la figure Le plus difficile est de trouver le bon moment pour initier le traitement.

Actuellement, un patient porteur de mtastases hpatiques ou trs symptomatiques douleur semble tre le bon moment pour employer ce traitement. La molcule de 1re intention est le doctaxel Taxotre associ de la prednisone, molcule appartenant la famille des inhibiteurs des microtubules.

En 2e ligne et pour les malades ayant eu une bonne rponse premire au doctaxel, le cabazitaxel Jevtana est une nouvelle chimiothrapie en cours dobtention dAMM. Il sagit dune taxane semisynthtique ayant montr rcemment une amlioration de la survie globale.

Sa place est dmontre dans le cancer de prostate rsistant la castration et a un effet clinique sur lvnement osseux fracture osseuse, douleur osseuse, hypercalcmie, compression mdullaire. Il est probable que dans les mois venir lalpharadine chlorure de radium remplace lacide zoldronique par une efficacit suprieure sur la rduction de la progression des mtastases osseuses, sur la rduction des vnements osseux types fractures ou tassement, et sur laugmentation de la survie globale.

Deux situations sont donc possibles : soit le volume de la prostate cancreuse obstrue la filire urtrale il sagit alors dun obstacle sous-. Lobjectif du clinicien est le traitement de tout nouveau symptme pouvant entraver le quotidien du patient. La prise en charge se fait de manire pluridisciplinaire et les dcisions sont souvent prises en runion de concertation pluridisciplinaire RCP , notamment avec laide active des quipes de soins palliatifs, du mdecin rfrent et des mdecins algologues.

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