Basics of Cervix Brachytherapy. William Small, Jr., MD Professor and Chairman Loyola University Chicago
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1 Gynecologic Cancer InterGroup Cervix Cancer Research Network Basics of Cervix Brachytherapy William Small, Jr., MD Professor and Chairman Loyola University Chicago Cervix Cancer Education Symposium, January 2017, Mexico
2 Gynecologic Cancer InterGroup Cervix Cancer Research Network OBJECTIVES 1. Review the history of Brachytherapy in Cervical Cancer. 2.Review the need for Brachytherapy in modern radiation. 3.Discuss HDR Co-60 vs. Ir Review Modern Image Guided Brachytherapy Cervix Cancer Education Symposium, January 2017, Mexico
3 Marie and Pierre Curie Antoine Henri Becquerel The discovery of radioactivity,
4 Applicators for intracavitary treatments Manchester / Fletcher: Tandem & Ovoids Stockholm: Tandem & Ring Institute Gustave Roussy: Mould technique
5 Summary Individualized Modern standardized Historical Parish Historical Paris Technique : Curie Institute, Paris, France Stockholm Manchester Fletcher Applicator: Rubber tandem not connected Cork colpostats (paraffin coated) no fixed geometry Stockholm Manchester & Fletcher Distance colpostats: not fixed 226 Ra preloading X mg of 226 Ra for Y hours Mould Typical application GEC ESTRO Handbook of Brachytherapy 5 days (120 h) mgh
6 Summary Individualized Modern standardized Historical Paris Classical Stockholm method : Radiumhemmet, Stockholm, Sweden Stockholm Manchester Fletcher Applicator: Flat box (plate) Flexible tube Stockholm Manchester & Fletcher not connected 226 Ra preloading No fixed geometry Intrauterine tube: mg Vaginal plate: mg Unequal loading of uterine / vaginal 226 Ra Mould Typical treatment 2 3 applications (á h) 7000 mgh
7 Summary Individualized Modern standardized Historical Paris Historical Manchester System 1938: Holt Radium Institute, Manchester, England Stockholm Manchester Fletcher Stockholm Manchester & Fletcher Mould
8 Summary Individualized Modern standardized Historical Historical Manchester System Related to historical Paris technique Paris Stockholm Manchester Fletcher Applicator: no fixed geometry Intrauterine tube 226 Ra preloading (mg): cm (L) Vaginal ovoid Flange cm (M) 2 cm (S) Stockholm 6 cm 4 cm 3.5 cm Manchester & Fletcher Mould Spacer TYPICAL TREATMENT: 140 hours for 7500 R at point A (dose rate 53 R/h) Point A 2 cm 2 cm Meredith WJ, ed.. Radium dosage. The Manchester system. Edinburgh;1947. Given tumour volume A set of rules Geometry mg of 226 Ra Duration Certain point A dose
9 Summary Individualized Modern standardized Historical Paris Fletcher Suit Delclos Horiot Technique 1950 s: Fletcher Stockholm Manchester Fletcher Adjustable tandem length Variety of curvatures Stockholm Manchester & Fletcher Flange Cylindrical colpostats +/- tungsten shielding Clamp 1 cm 2 cm Mould Fixed geometry 2.5 cm 3 cm
10 Summary Individualized Modern standardized Historical Paris Modern Intracavitary Techniques Applicators: mimicking historical geometries Stockholm Manchester Fletcher Manchester / Fletcher style Common features: Stockholm style Uterine Tandem: various lengths, angles or curvatures Stockholm Manchester & Fletcher Ovoids, cylinders, rings various outer & source path diameters Clamp Mould mm Source path Ф Outer Ф mm 47 mm
11 Is There a Need for Brachytherapy with Modern External Beam Radiation? Cervix Cancer Education Symposium, January 2017, Mexico
12 Gynecologic Cancer InterGroup Cervix Cancer Research Network Methods Population-based, retrospective cohort study of 18 SEER registries Inclusion Criteria: Stage IB IVA cervical cancer treated between with RT Exclusion Criteria: Rare histologies Treated with surgery History of other malignancy Han et al, Int J Rad Oncol Bio Phys, 2013
13 Gynecologic Cancer InterGroup Cervix Cancer Research Network Patient & Tumor Characteristics by Brachytherapy Use Cervix Cancer Education Symposium, January 2017, Mexico
14 Brachytherapy utilization rate (%) Gynecologic Cancer InterGroup Cervix Cancer Research Network Brachytherapy utilization rate in 18 SEER registries Cervix Cancer Education Symposium, January 2017, Mexico
15 Gynecologic Cancer InterGroup Cervix Cancer Research Network Independent Predictors of Brachytherapy Use Younger age Married (vs not) Earlier year of diagnosis Earlier stage Certain SEER regions Cervix Cancer Education Symposium, January 2017, Mexico
16 Gynecologic Cancer InterGroup Cervix Cancer Research Network Cervix Cancer Education Symposium, January 2017, Mexico
17 Gynecologic Cancer InterGroup Cervix Cancer Research Network Cervix Cancer Education Symposium, January 2017, Mexico
18 Multivariable Cox Regression Characteristics Cancer-Specific Survival Overall Survival HR (95% CI) P HR (95% CI) P Brachytherapy No 1 (reference) 1 (reference) Yes 0.64 ( ) < ( ) <.001 Stage IB2 1 (reference) 1 (reference) II 1.18 ( ) ( ).18 III 2.28 ( ) < ( ) <.001 IVA 3.50 ( ) < ( ) <.001 Histology SCC 1 (reference) 1 (reference) Adenocarcinoma 1.32 ( ) ( ).005 Other 1.26 ( ) ( ).07 Other significant factors: Age; Marital Status; Race; Ethnicity; Registry
19 Gynecologic Cancer InterGroup Cervix Cancer Research Network Conclusions Recent decline in brachytherapy utilization in the U.S. Brachytherapy use is independently associated with significantly higher CSS and OS. Brachytherapy should be implemented in all feasible cases. Cervix Cancer Education Symposium, January 2017, Mexico
20 Refaat et al. Am J Clin Oncol Jan 30. [Epub ahead of print]
21
22 A) Intraoperative imaging at the time of first implant B) Isodose distribution with 2002 cgy delivered continuously to point A over hours using Cs-137 for the first implant with a total activity of mci. Refaat et al. Am J Clin Oncol Jan 30. [Epub ahead of print]
23 129 eligible cervical cancer patients The median age was 46 years stages I, II, III, IV (29.5%, 48.1%, 17.8% and 4.6% respectively). The median follow up was 37 months (mean 58 ± 59, range 3 275). The 3-years OS, PFS, LRC, and DC were 75.9%, 71.6%, 84.7%, and 80.2%, respectively. The 5-years OS, PFS, LRC, and DC were 70.7%, 68.7%, 84.7%, and 78.3%, respectively. The 10-years OS, PFS, LRC, and DC were 68.7%, 62.3%, 82.5%, and 73.2%, respectively. Refaat et al. Am J Clin Oncol Jan 30. [Epub ahead of print]
24 Refaat et al. Am J Clin Oncol Jan 30. [Epub ahead of print]
25 Conclusion Standard LDR Brachytherapy cures significant percentage of patients although there is room for improvement. There is not insignificant long term toxicities.
26 Gynecologic Cancer InterGroup Cervix Cancer Research Network HDR - Sources CO60 vs IR192 Cervix Cancer Education Symposium, January 2017, Mexico
27 Gynecologic Cancer InterGroup Cervix Cancer Research Network More than 300 installed Systems in more than 50 Countries Most using Co60 sources Cervix Cancer Education Symposium, January 2017, Mexico
28 Gynecologic Cancer InterGroup Cervix Cancer Research Network Important parameter for a HDR source Doserate : must be in the HDR-Doserate range Biological effects Treatment time Dimension : as small as possible For interstitial and intraop treatment small applicators Dose - distribution : strong dose gradient high dose to target volume but low dose to OAR Cervix Cancer Education Symposium, January 2017, Mexico
29 Gynecologic Cancer InterGroup Cervix Cancer Research Network 0.9 C M o- in 6 i 0 atu S ri o ze u d rc C e o- ( 6 C 0 o S 0 o. u A r 8 ce 6) Ir-192 Source Ir-192 Source (Ir2.A85-2) source transfers use for 5 years Co-60 Sources are not large anymore Cervix Cancer Education Symposium, January 2017, Mexico source transfers use for 3,4 (5) month Co-60 source is suitable for all BT applications
30 Gynecologic Cancer InterGroup Cervix Cancer Research Network Source Specifications Cobalt-60 Iridium-192 ISO Classification C C Half-life 5,27 years 73,8 days Physical-Chemical form solid, metal solid, metal Source activity 74 GBq ± 10% 370 GBq + 30%; -10% Outer dimensions of the source: Diameter Total length of the wire: 1 mm 2180 mm 0,9 mm 2180 mm Dimensions of active part Diameter: Length: Working life 0,5 mm 3,5 mm max source transfers or 5 years 0,6 mm 3,5 mm max source transfers or 4 months Cervix Cancer Education Symposium, January 2017, Mexico
31 Gynecologic Cancer InterGroup Cervix Cancer Research Network Physical Data The air kerma-rate-constant is almost three times higher for Co-60 than for Ir-192 Nuclid e _ E (MeV) T 1/2 (Ci/g) Γ (μgy m 2 GBq -1 h - 1) d 1/10 1) (lead) d 1/10 (concret e) air mean energy half-life specific activity kermarate constant tenth value layer tenth value layer Co ,27a ,8cm 32cm Ir ,8d ,2cm 23cm Co-60 vs. Ir- 192: factor 2.86
32 Gynecologic Cancer InterGroup Cervix Cancer Research Network Sample treatment time Ir-192 vs Co-60 Cervix cancer Fletcher Applicator Standard loading 5 Gy to Manchester A point IR192 (2 month) 22,8 mgy/h 207 GBq ~ 11 Min Co60 (1 years) 18,5 mgy/h 56,9 GBq ~ 11 Min Cervix Cancer Education Symposium, January 2017, Mexico
33 Gynecologic Cancer InterGroup Cervix Cancer Research Network Dose at the OAR even little bit lower for Co-60 than for Ir-192 Comparable dose distribution of Co-60 and Ir-192: Vaginal applicator Cervix Cancer Education Symposium, January 2017, Mexico
34 Gynecologic Cancer InterGroup Cervix Cancer Research Network Anisotropy Almost no difference between Co-60 and Ir-192 except the dip in direction of the source axis Cervix Cancer Education Symposium, January 2017, Mexico
35 Gynecologic Cancer InterGroup Cervix Cancer Research Network Isodoses: Co-60: green: 10Gy yellow: 7.5Gy red: 5Gy blue: 2.5Gy Ir-192: all white Cervix Cancer Education Symposium, January 2017, Mexico
36 Gynecologic Cancer InterGroup Cervix Cancer Research Network Number of source Ir-192 (every 4 months) Co-60 (every 5 years) 10 years years 45 3 source exchanges using Co-60 mean: less expenses for sources less QC workload less logistic problems, less paperwork no loss of treatment days Cervix Cancer Education Symposium, January 2017, Mexico
37 Gynecologic Cancer InterGroup Cervix Cancer Research Network Cervix Cancer Education Symposium, January 2017, Mexico
38 Current State of The Art Brachytherapy
39 Gynecologic Cancer InterGroup Cervix Cancer Research Network Cervix Cancer Education Symposium, January 2017, Mexico
40 Gynecologic Cancer InterGroup Cervix Cancer Research Network Cervix Cancer Education Symposium, January 2017, Mexico
41 KBD
42 Gynecologic Cancer InterGroup Cervix Cancer Research Network Cervix Cancer Education Symposium, January 2017, Mexico
43 Gynecologic Cancer InterGroup Cervix Cancer Research Network Cervix Cancer Education Symposium, January 2017, Mexico
44 Gynecologic Cancer InterGroup Cervix Cancer Research Network Cervix Cancer Education Symposium, January 2017, Mexico
45 Gynecologic Cancer InterGroup Cervix Cancer Research Network Cervix Cancer Education Symposium, January 2017, Mexico
46 Summary Limitations modern intracavitary techniques Historical Paris Stockholm Manchester Fletcher Modern Intracavitary Techniques Covering the target volume with prescribed dose ( ) Standard loading target V Mid-coronal view
47 Summary Limitations modern intracavitary techniques Historical Paris Stockholm Manchester Fletcher Modern Intracavitary Techniques Covering the target volume with prescribed dose ( ) Modified loading target V Mid-coronal view
48 Summary Limitations modern intracavitary techniques Historical Paris Stockholm Manchester Fletcher Modern Intracavitary Techniques Covering the target volume with prescribed dose ( ) Modified loading Boost needed... EBRT? Interstitial BT? cold region target V Mid-coronal view
49 Gynecologic Cancer InterGroup Cervix Cancer Research Network Cervix Cancer Education Symposium, January 2017, Mexico
50 Gynecologic Cancer InterGroup Cervix Cancer Research Network Cervix Cancer Education Symposium, January 2017, Mexico
51 GEC-ESTRO Recommendations: Specific requirements for MRI T2-weighted images: High signal intensity After EBRT : intermediate signal intensity («grey zones») Image orientation: parallel orthogonal para-transversal para-coronal para-sagittal to applicator axes
52 Para coronal Para sagittal Specific requirements for MRI 52 Para transverse
53 Are we making any difference? Why to change from long-used practice to image guidance??!!
54
55
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57 Conclusion Brachytherapy is critical in the treatment of locally advanced cervical cancer. LDR or HDR are reasonable choices. Modern brachytherapy includes MRI image guidance.
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