radiation therapy for soft tissue sarcoma · high grade sarcoma, combination of limb sparing...
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Current Management in Soft Tissue Sarcoma
Radiation Therapy for Soft Tissue Sarcoma
Putipun Puataweepong, M.D,M.Sc.Radiation Therapy and Oncology Unit
Ramathibodi Hospital, Mahidol University30 March 2019
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Scope of presentation• Types and methods of RT delivery : WHAT • Rationale for the use of RT : WHY• Timing and scheduling of RT : WHEN• RT process and techniques : HOW • RT complication
Extremity soft tissue sarcomaRetroperitoneal sarcoma
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Soft tissue sarcomaManagement by multimodality team
Case review at multi-disciplinary team
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Types and methods of RT delivery
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
What is radiation ?• Radiation is energy that comes from a source and
travels through some material or through space• Non-ionizing (low energy)
• Ionizing (high energy) radiation For medical use
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Radiation therapy modalities Teletherapy or External beam radiation therapy Photon
eg. Co-60 machine, Linear accelerator (LINAC) Particle beam
Brachytherapy eg. Ir-192 (sealed source), I-125 (unsealed
source)intracavitaryinterstitialmould
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
The evolution of RT techniques
El-Bared et al. Curr. Treat. Options in Oncol. (2015)
Study - advance RT with reduce RT volume -toxicities and local control rates
RCT - preopvs postop RT in extremity STS
2DRT 3DRT IMRT IGRT
RT+Targeted therapy Adaptive RT
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
External beam RT Linear accelerator(Linac)- High energy X-
ray- 6 MV,10MV15 MV
Cobalt unit
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Goal maximize RT dose to tumor
minimize dose to normal tissue
2D
3D-CRT IMRTIGRTART
Conformal Radiotherapy(tailor-made treatment)
External beam RT: New TrendExternal beam RT
Particle beam RT
Advanced RT techniques
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Advanced radiation therapy
OAR dose
Tumor dose
Target missing risk
Set up errors deletion
Organ motion reduction/compensation
Rationale
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
3D-conformal Radiotherapy (3DRT)Technique
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Intensity modulated Radiotherapy (IMRT)
Technique
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Image-guided Radiotherapy (IGRT)
Technique
OBI
EPID
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the LandAdaptive RT ( ART)
Tumor volumes change during preoperative RT delivery
Shrinking
tumor
Growing
tumor
C. Dickie et al. / Radiotherapy and Oncology
122 (2017) 458–463
1st
CT sim
2nd
CT
1st CT sim
2nd
CT Target underdose
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land3D-CRT vs IMRT/IGRT
7.6%
15.1 %
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
PMH; Preop advanced RT
-The need of tissue transfer, RT chronic morbidity and subsequent operation for wound complication was reduce-Maintain local control 93.2%
Acute wound complication - IGRT =30.5% - 2D-3D CRT = 43% ( historical compare with NCIC)
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Particle Beam Radiotherapy• Neutrons
– Uncharged, high LET• Protons & α-particles
– Charged, low LET• Light ions eg. carbon, neon
– Charged, high LET
• 2 important characterisitics– Better depth-dose distribution & reduced penumbra
• Intensity modulated, conformal radiotherapy– High LET
X-ray
Proton
Bragg peak
Depth in tissue
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Particle Therapy
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Proton 3D-CRT
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Intraoperative Radiotherapy (IORT)IOERT, IOBRT
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Intraoperative Radiotherapy (IORT)• NCI - 35 RPS patients randomized comparing
20-Gy IORT in combination with postoperative low-dose (35- to 40-Gy) EBRT with postoperative high-dose (50- to 55-Gy) EBRT alone– LR was significantly lower in IORT group– Fewer radiation-related enteritis but
radiation-related peripheral neuropathy was more frequent in IORT group
Sindelar WF, Kinsella TJ, Chen PW, et al. clinical trial. Arch Surg. 1993;128:402-410.
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
IORTMGH – long term results of 10-20 Gy IOERT following preoperative EBRT
( 45Gy) and gross tumor removal In IOERT group - LC =83% and OS=74% In no IOERT group - LC=61% and
OS=30%
Gieschen HL, Spiro IJ, Suit HD, et al. Long-term results of intraoperative electron beam radiotherapy for primary and recurrent retroperitonealsoft tissue sarcoma. Int J Radiat Oncol Biol Phys. 2001;50:127-131.
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Technique
Brachytherapyo Insertion of encapsulated
radioisotope inside or
close to tumor
o HDR Ir-192 Machine
o 2D-technique or 3D-
technique
o Intracavitary, Interstitial,
Surface (Mould)
o High dose to target with
normal tissue protection
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
• MSKCC – randomized study of 164 patients• Adjuvant brachytherapy vs surgery alone• 10 year LC -81% in BCT and 67% in nonBCT
(p=0.03) in high grade sarcoma• The improvement in LC was limited in high grade
without effect on low grade
Brachytherapy
Pisters PW, Harrison LB, Leung DH, et al. Long-term results of a prospective randomized trial of adjuvant brachytherapy in soft tissue sarcoma.J Clin Oncol. 1996;14:859-868.
BCT retrospective compared with IMRT in 134 high grade – 5 year LC=92% for IMRT vs 81% for BCT (p=0.04) Alektiar KM, Brennan MF, Singer S. Local control comparison of adjuvant
brachytherapy to intensity-modulated radiotherapy in primaryhigh-grade sarcoma of the extremity. Cancer. 2011;117:3229-3234
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Fractionation in Radiotherapy• Conventional fractionation ***
– 1.8-2 Gy/fraction, 1 fraction/day, 5 days/week• Alter fractionation
– Hyperfractionation• Smaller dose/fraction, increased number of fraction• Total period of time minimally changed• Total dose increased
– Accelerated fractionation• Shortening overall treatment time
– Hypofractionation• Larger dose/fraction, decreased number of fraction
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Altered Fractionation• Kosela et al
– Preoperative hypofraction RT for extremity and trunk STS ,272 patients
– 5 Gy X 5 Fractions and immediate surgery – LR = 19%, higher compared with other series
- Brant et al– Preoperative hyperfraction 1.2 -1.25 Gy twice daily to
50.4 Gy– Operations were performed 2 to 6 wks after RT.– LC = 91% with 16 % wound complication and 7.7% bone
fracture
Kosela-Paterczyk H. Eur J Surg Oncol. 2014;40:1641-1647.
Brant TA, Parsons JT, Marcus RB Jr, et al. Int J RadiatOncol Biol Phys. 1990;19:899-906.
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
• Localized extremity soft tissue sarcoma • Retroperitoneal sarcoma
Rationale for the use of RT
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Treatment of Localized extremity soft tissue sarcoma
• Decades ago: Amputation• Now: Limb-sparing surgery and Radiation
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Need for adjuvant RT after conservative surgery Study Treatment arms LR OS or DFS
Pisters et al MSKCC 1996N=164Extremity, trunk
High grade (n=119)CS vs CS+Brachy RT
Low grade(n=45)CS vs CS+Brachy RT
30% vs 9% (p=0025)
36% vs 26%(p=0.49)
5 year DFS 81% vs 84% (p=0.65)
Yang et al NCI 1998N=141Extremity
High grade (n=91)CS vs CS+EBRT*Chemo
Low grade (n=50)CS vs CS+EBRTLarge field to 45 Gyboost to 63 Gy
20% vs 0%(p=0.001)(10 yr)
33% vs 4% (p=0.003)
10 year OS92% vs 92%
In large, deep seated, intermediated to high grade sarcoma, combination of limb sparing surgery with RT permit more conservative surgery with high local control rate ~90%
Level I evidence
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Need for RT after conservative surgery
Koshy M et al.Int J Radiat Oncol Biol Phys 2010.
Survival benefit for the addition of RT to surgery in ESTSs, especially for high-grade
sarcoma
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Adjuvant RT in extremity soft tissue sarcoma
• In large, deep seated, intermediated to high grade sarcoma, combination of limb sparing surgery with RT permit more conservative surgery with high local control rate ~90%
• Survival benefit for the addition of RT to surgery in ESTS, especially for high-grade sarcoma
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Postoperative RT in Retroperitoneal sarcoma
Pezner et al. American Journal of Clinical Oncology 2011
-High rate of local relapse -More acute and late RT complication especially in patient with high dose RT
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
- Only MFH -improve OS and DSS
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the LandSurgery and Radiation Sequencing
Pre-operative RT Surgery
Surgery Post-operative RT
OR
Efficacy: Similar- Excellent local control 85-100%- Comparable overall survival - Toxicities: Different
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Preoperative RTAdvantages• Smaller RT fields• Lower RT doses• Reduced tumor
implant and seeding • Tumor down staging• Radiobiological
advantageDisadvantages• High risk of major
wound complications
Surgery and Radiation Sequencing Postopertive RTAdvantages• Complete tumor specimen –
pathology review for true histology and margin status
• Lower risk of major wound complications
Disadvantages• Larger treatment volumes• Higher doses• More hypoxic tissue
Radiobiology disadvantage• High incidence of late
toxicity
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Closed early after a planned, preliminary analysis showed a
significant difference in primary outcome (wound
complication )
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the LandUpdated Results of NCIC Trial 2002
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Factors predict late RT toxicity
• Field size • Dose of RT
Larger and higher in post-op RT
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the LandRT Dose and Volume Definition
Postoperative RTPhase I – Dose 45-50.4 Gy ,1.8-2 Gy once daily fractionGTV- the resected “GTV” recreated form pre-op imagingElective CTV - consider compartment at risk of microscopic
spread. Should include biopsy site, drain site and scarGTV+ 4 cm longituidinal, 1.5 cm radially
Elective PTV = CTV+ 1 cm in all direction (vary by institutional protocol)
Phase II – Dose 10-16 Gy, total dose of 60-66 GyBoost CTV: GTV + 2cm longitudinal, 1.5 cm radial Boost PTV: boost CTV+ 1 cm in all direction (vary by institutional protocol)
Strip of tissue should be spared laterally (if possible): to decrease the risk of lymphedema
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Haas et al. Int J Radiat Oncol Biol Phys 2012. Target definition for postop RT – phase I
Target definition for postop RT – phase II
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Base on RTOG sarcoma working group consensus(2011)GTV: Delineated by T1 post gad MRICTV: for intermediate to high grade sarcoma >/= 5 cm
GTV+4 cm in the longitudinal and 1.5 cm radially, not need to be expanded beyond the compartment or surface of bones and fascia
Peritumoral edema on T2 MRI should included within CTV
Extensive T2 edema – may be excluded clinical judgment suggest the risk of the edema harboring sarcoma beyond GTV is low or cause excessive toxicityPTV: CTV+0.5 cm to 1 cm margin ( depend on institute
protocol)A total dose of 50 Gy in 25 fraction with surgery following 4-8 weeks later
RT Dose and Volume DefinitionPreoperative RT
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Lawrence et al. Int J Radiat Oncol Biol Phys 2005.
Finding sarcoma cells 4 cm beyond the tumor gives a basis for 4 cm longitudinal
expansion of the GTV to CTV
9/10 case - Satellite tumor were identified histologically in areas with high T2 signal change
- Rationale for inclusion of area of T2 change in preop CTV
CTV = GTV+ 4 cm and included edemaWhy ?
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Are large CTV expansion necessary ?
2 prospective trials are addressing this issue• VORTEX trial : Randomised trial of volume
of post-operative radiotherapy given to adult patients with extremity soft tissue sarcoma
• RTOG 0630 : A phase II trial of image guide preoperative radiotherapy for primary soft tissue sarcomas of the extremity
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
VORTEX trial
to assess if a reduced volume of post-operative radiotherapy increases limb function without compromising local control
Cancer Research UK
Completed accrual and await for the results
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
RTOG 0630 Phase II Trial of Image Guided Preoperative Radiotherapy for Primary Soft Tissue Sarcomas of the
Extremity
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
RTOG 0630- CTV marginsCTV for intermediate to high grade tumor >/=8 cm:
CTV= GTV and suspicious edema plus 3 cm margins in the longtitudinal ( proximal and distal) directions
If this causes the field to extend beyond the compartment, the field can be shorted to include the end of a compartment
The radial margin from the lesion should be 1.5 cm included any portion of the tumor not confined by an intact fascial barrier or bone or skin surface
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
RTOG 0630- CTV marginsCTV for all other tumors
CTV= GTV and suspicious edema ( defined by MRT T2 images) plus 2 cm margins in the longtitudinal(proximal and distal) directions
If this causes the field to extend beyond the compartment, the field can be shorted to include the end of a compartment
The radial margin from the lesion should be 1 cm included any portion of the tumor not confined by an intact fascial barrier or bone or skin surface
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Late RT toxicities ( >/= grade 2 )- IGRT =10.5% - 2D-3D CRT = 37% ( historical compare with NCIC)
RTOG 0630Preop RT +
Reduced margin + Advance RT+ Postop RT boost
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
37.3%11.4%
0%5.1%
2 yr
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
2 year OS =80.6%
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
RTOG 0630 15 % - postop RT boost
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
RT boost is needed following preop RT and surgery with positive resection margin ?
Methods to add postop RT boost - EBRT – 16 Gy/8 fractions
- Start 2 week post surgery - Metallic clips – recommend to define the
residual tumor bed for a positive margin - Brachytherpay ( LDR or HDR )
- Not start until day 5 after surgery and must completed within 2 week after surgery.
- IORT 10-12.5 Gy
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the LandRT boost is needed following preop RT and surgery with
positive resection margin ?
• 216 ESTS patients with a positive surgical margin• 52 - preoperative RT alone (50 Gy) • 41 - preoperative RT + a postoperative boost ( 16 Gy,a total of 66 Gy )• LR – preop RT alone - 6 of 52 • - boost group - 9 of 41 • Five-year estimated LR-free survivals were 90.4% and 73.8%,
respectively (p = 0.13)Al Yami A, Griffın AM, Ferguson PC, et al. Positive surgical margins in soft tissue sarcoma treated with preoperative radiation: is a postoperative boost necessary? Int J Radiat Oncol Biol Phys. 2010;77:1191-1197
67 patients - pre-operative RT and surgery with positive margin(s). • No RT boost =10• BRT or IORT boost =10 • EBRT boost = 47 • 5 year LC for no boost, BRT/IORT boost, • and EBRT boost were 100%, 78%, and 71% (P = 0.5).
Pan E, Goldberg SI, Chen YL, et al. Role of post-operative radiation boost for soft tissue sarcomas with positive margins following preoperative radiation and surgery. J Surg Oncol. 2014;110:817-822
The results - not identify a LC advantage for an RT boost
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Pre-op RT Post-op RT
Favorable anatomical issues, including the tumor displacement of critical radiosensitive organs away from the preoperative RT field, thereby reducing toxicity and improving tolerance
RPS: pre-op RT vs post-op RT
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
M .J.F. Smith et al./Radiotherapy and Oncology 110 (2014) 165–171Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Volume DefinitionPreoperative RT for Retroperitoneum sarcoma
Baldini EH. Treatment Guidelines for Preoperative Radiation Therapy for
Retroperitoneal Sarcoma: Preliminary Consensus of an International Expert
Panel. Int J Radiat Oncol BiolPhys. 2015;92:602–12.
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Contouring 1.GTV 2. Contour the entire “bowel bag” or peritoneal cavity using guidelines from RTOG atlas on the RTOG website 3. CTV - uniform GTV expansion of 1.5 cm with edited reduction at bone (0 mm), bowel bag, and air cavity (5 mm), renal and hepatic interfaces (2 mm), and skin surface (3 mm)4. The high-risk boost- high risk for positive margins following resection. Areas of tumor located along posterior abdominal wallipsilateral para- and prevertebral spacemajor vessels, or organs that the surgeon would leave in situ.5. Contour small bowel, colon, stomach, and duodenum.
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land• Baldini EH. Treatment Guidelines for Preoperative Radiation Therapy for
Retroperitoneal Sarcoma: Preliminary Consensus of an International Expert Panel. Int J Radiat Oncol Biol Phys. 2015;92:602–12.
Colors correspond to the contours:Red=gross tumor volume; blue=clinical target volume; yellow=high-risk clinical target volume boost; pink=stomach;light blue = duodenum; mustard yellow =small bowel; brown =colon; and green = bowel bag.
De-differentiate liposarcoma
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
A Phase III Randomized Study of Preoperative Radiotherapy Plus Surgery Versus Surgery Alone for Patients With
Retroperitoneal Sarcoma (RPS) (STRASS)
EORTC study • Arm I: En-bloc resection • Arm II: preoperative RT followed by en-bloc
resection 3D-CRT or IMRT 50.4 Gy/28 fractions.
• 256 pt – closed to accrual• Primary objective : abdominal recurrence
free survival
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
RT simulation and treatment planning process
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Positioning and Simulation Positioning: • Depends on the site of the primary lesion• Stable and reproducible position – basic
essential • Make custom immobilization device to
reproduce position on a daily RT treatment• Optimal positioning to treat the affected
compartment with minimal treatment of uninvolved tissue
• Obtain CT or MRI scan in treatment position
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
CT simulator MRI simulator
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the LandImmobilization device
Optimal positioning to treat the affected compartment with
minimal treatment of uninvolved tissue
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Target delineation and treatment planning
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Target delineation and treatment planning
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Acute RT skin reaction
Hyperpigment
Dry desquamation
Moist desquamation
Preoperative RT -25% to 46% Postoperative RT - 6% to 29%- Usually reversible
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Fatal RT complication • Duodenocaval fistula (DCF)• Rare but severe and fatal • The mortality rate -> 40%.• The most common etiology
– Trauma – Resection of a
retroperitoneal tumor combined with adjuvant postoperative irradiation
Perera e l al. Annals of Vascular Surgery.2004Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
– Edema, subcutaneous fibrosis, decreased muscle strength, decreased range of motion, pain, and, less commonly, bone fracture and peripheral nerve damage
– Higher complication rates with higher doses ( >60-63 Gy) and larger field sizes: post-op RT
– Large RT field sizes have also been associated with more edema, fibrosis, and joint stiffness
Late RT Toxicities
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Conclusions• The local recurrence of ESTS following limb-
sparing surgery alone 30-50%• The additional of pre-or postoperative RT improves
local control to 80-90% with excellent functional outcome
• For RPS, the benefit of RT has not been proven• Preoperative RT seems to be the safest process
of delivery• The advance RT techniques with the reduction in
the volumes of RT give an advantage of adequate tumor dosage with less toxicity
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
• Most evidence – No level 1 evidence, no well design RCT
• Relative small number of patient • Short F/U - advanced RT technique • Disagreement exists across the published
series• Benefit – Increase local control , low toxicity
- No overall survival benefit
Conclusions
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
• All deep seated tumors• All high grade tumors• Intermediate grade tumor, size >5 cm• Low grade tumors:
• Positive or close ( <1 cm ) resection margins• Locally recurrent disease following initial wide
excision • Tumor location that would not be ameable to
subsequent salvage surgery
Indication for RT
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
• Postoperative therapy:– Initial volume usually 45 Gy– Final cone down to 63- 65 Gy– 1.8 Gy fractions, five fractions per week
• Preoperative irradiation:– Single phase treatment with RT dose of 45 to
55.8 Gy, conventional fraction– Intraoperative boost or additional
postoperative irradiation as indicated by surgical margin ( optional )
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the LandVolume of RT
• Preoperative RT
Larger RT volumeEntired operative bed+ margins
GTV
CTV
PTV
Smaller volumeTumor + margins
Postoperative RT
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Pre-op RT Post-op RT
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the LandSurgery and Radiation Sequencing
Pre-operative RT
Lower dose50 Gy / 25 fractions
Smaller RT volumeTumor + margins
More acute wound complication (35% vs 17%)
Usually reversible
Post-operative RT
Higher dose 60 Gy/30 fractions
Larger RT volumeEntired operative bed+margins
More late complication (fibrosis, edema, joint stiffness)
Usually irreversible
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th
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Ramathibodi Hospital Faculty of Medicine Mahidol University: Wisdom of the Land
Surgery and Radiation sequencing • Equivalent efficacy• Different toxicities• Treatment approach should be
individualized • We ( Radiation oncologist) prefer pre-op
RT for most situation – Lower dose, small treatment volume, less
irreversible long term toxicity
Department of Diagnostic and Therapeutic Radiology: radiology.mahidol.ac.th