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TUMORE DELLA PROSTATA: LO STATO
DELL’ARTE
RADIOTERAPIA
Maurizio Valeriani
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• 186.320 nuovi casi negli USA nel 2008
• Seconda causa di morte per cancro negli USA
• Età media >70 aa
• Razza nera/bianca = 1.5-2.0/1 (USA)
• Adenocarcinoma (≈95%)
• Spesso multifocale
• 42.804 nuovi casi in Italia (2005)
• 153/100000 abitanti (2005)
• 9925 nuovi casi nel centro Italia (2005)
• 4853 nuovi casi nelle regioni Lazio, Abruzzo e Molise (2005)
Epidemiologia
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Prostatectomia radicale
o
RT conformazionale
BRT
BRT/RT esterna
o
o
“Nerve sparing”
Prostatectomia laparoscopica Chirurgia robotica
IGRT
3D
IMRT
Proton High dose conformal Dose escalation
Ipofx HDR
LDR HIFU
RITA
Crioterapia +/- OT
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Evolution of Radiotherapy
Thariat, J et al. Nat. Rev. Clin. Oncol. 10, 2013 Cancer Res 2009; 69: (2), 2009
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7 RCTs included (2812 pts): Zietman et al Dutch MRC RT01 M.D. Anderson Shipley et al Sathya et al GETUG
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Low risk Intermediate risk
High risk
Conclusion
HDRT significant reduce BF in low, int, high risk. Across a range 64 to 79.2 Gy in localized prostate cancer BC is linear. Incresing total dose reduces the risk of BF by 1.8% for each 1 Gy increase. Hypothetically the RT dose of approximately 86.5, 90.4 and 95.5 Gy would need to be delivered to low, int and high risk for 100% BC rate HDRT > risk of G≥2 RTOG bowel toxicity with HDRT. GU adverse effects: ns.
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Fusion TC-RM
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Improved Outcomes
Reduced Side Effects
IMRT 3DCRT IGRT
Radiation Field
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3DCRT 7F
3DCRT 17F
(“hyper”)
IMRT
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IGRT (image guided radiation therapy)
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Organ Motion
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Organ motion
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PTV: 60 Gy in 20 fr. on prostate and 1 cm the proximal seminal vescicles Margin from CTV to PTV was 5 mm in all directions
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Daily cone beam CT (IGRT)
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Technological developments and the possibility of obtaining highly selective irradiation techniques, have recently renewed the clinical interest for these treatment modalities, not only in terms of palliation only, but also in the context of therapeutic strategies targeted to the increase in local control of the disease and, consequently, the final result of the treatment.
Hypofractionated Radiotherapy
The use of large dose fractions reducing the weekly (fewer than five fractions) and overall number is currently know as ‘hypofractionation’; the use of high dose fractions is generally associated with a reduction of the final dose.
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Hypofractionation: radiobiological rationale and clinical implications
- Higher dose per fraction Potential dose escalation with a higher BED: Theoretical advantage on local tumor control
- Reduced overall treatment time Reduce tumor cell repopulation Overall treatment time is reduced to 1 to 2 weeks Improved patient convenience and reduced cost (Avoidance of waiting list;reduce demand on RT resources)
- Concerns of a disproportionate increase in late normal tissue toxicity (α/β ratio of tumor and normal tissues)
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Unlike most cancers, the α/β ratio of the prostatic carcinoma is probably lower than that of the healthy organs around the gland, although there is no agreement as to how low this α/β really is.
This peculiarity implies that, theoretically, a hypofractionated schedule would increase the therapeutic gain of radiotherapy
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Fowler JF, Ritter MA, Chappel RJ, Brenner JD Int J
Radiat Oncol Biol Phys 2003.
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SBRT
• Highly focused radiation concentrated on tumors – low dose to surrounding tissue
• Single or hypofx treatments – high dose per treatment
• Very precise delivery – image guidance, immobilization, and other technologies to ensure accuracy
• Historically used mainly for treating intracranial lesions
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S. Arcangeli – C. Greco Nature Review Urology, 2016
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Space OAR
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pre
SpaceOAR SpaceOAR
Anterior rectal wall sparing
pre- gel injection
post- gel injection
Space OAR
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pre
Space OAR
Rectum
Rectum with SpaceOAR
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Brachiterapia
E’ una tecnica radioterapica conformazionale che consiste nel posizionare
sorgenti radioattive all’interno del tumore o a contatto con esso per un tempo
prestabilito!
La caratteristica fondamentale è
un rapido “gradiente di dose” che consente di adattarsi al volume da irradiare,
risparmiando i tessuti sani circostanti!
Brachiterapia
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Brachiterapia
Brachiterapia
Impianto permanente
LDR (125 I , 103 Pd) erogazione continua della dose
(mesi)
Impianto temporaneo
HDR (192 Ir) erogazione frazionata della dose
(minuti)
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