Quality Variation and Clinical Impact in Head and Neck IMRT
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1 Quality Variation and Clinical Impact in Head and Neck IMRT 6 th IMRT Symposium, New York Sep. 20, 2010 K.S. Clifford Chao, MD Chairman, Combined Radiation Oncology, New York Presbyterian Hospital Chairman, Radiation Oncology, Columbia University College of P & S Chief, Radiation Oncology, Weill Cornell Medical College
2 Tumor Control by IMRT vs non-imrt in Patients with Oropharyngeal Carcinoma Patient No. Median F/U 2yr LRC 2yr DFS Def. Non-IMRT yr ( ) 17.7) 68.3% 58.4% Def. IMRT 31 3 yr (12-58) 87.5% 73.5% Post-op op Non-IMRT yr ( ) 19.8) 75.7% 73.5% Post-op op IMRT yr (9-60) 95.0% 94.3% Data compiled from Chao et al. Radiotherapy & Oncology, 61:275, 2001 and Chao et al. IJROBP 59:43-50, 2004
3 T2N1M0 SCC of Base of the Tongue
4
5 T2N1M0 SCC of Base of the Tongue CTV70 GTV CTV60 CTV50 Chao et al. Int J Radiat Oncol Biol Phys May 1;59(1):43-50.
6 Consensus on Nodal Level Delineation UCL, Erasmus, RTOG, EORTC, DAHANCA, GORTEC IA IA IB IIA IIB IB IIA IIB IB IIA IIB Level I Level II Level III Level IV Level V Level VI RP
7 PET/MRI/CT GTV Boundary Daisne et. al. Radiology 233(1):93-100, 2004
8 Nodal CTV Delineation Margin?
9 Microscopic Tumor Extension outside Nodal Capsule 97 ECE+ LNs from 49 patients Tumor extension through the LN capsule by: Ø Ø Ø Actual presence of tumor cells Desmoplasia (associated stromal reaction) Giant cell reaction to keratin Greatest linear distance perpendicular from external capsule border to furthest extent of tumor Ø Ø Nearest tenth of millimeter with micrometer Extrapolation when appropriate Largest axial diameter of LN Apisarnthanarax et al. Int J Radiat Oncol Biol Phys. 64:678, 2006
10
11 C T T C
12 2 mm
13 Results 96% ECE within 5 mm of capsule None beyond 10 mm Inverse correlation between ECE incidence and distance from capsule ECE incidence (% ) r = Distance from LN capsule (mm) Apisarnthanarax et al. Int J Radiat Oncol Biol Phys. 64:678, 2006
14 Results 100 Cumulative ECE incidence (%) Cumulative ECE Incidence (%) Hypothesis < 1 cm LNs 1-2 cm LNs > 2 cm LNs < 1 cm LNs > 1 cm LNs Distance from capsule (mm) Distance from LN capsule (mm) No correlation between LN and extent of ECE Mean ECE Ø Ø LN < 1 cm: 2.1 mm LN > 1 cm: 2.2 mm
15 Nodal CTV Delineation 0.5 cm CTV margins Apisarnthanarax et al. Int J Radiat Oncol Biol Phys. 64:678, 2006
16 HN IMRT Challenges Ahead Significant growth of IMRT accompanied by increase in time-consuming contouring Significant variation in target determination and delineation
17 Cancer, 1977 Variation among RadOnc Physicians Exists I must hasten to add that for disease sites examined, many more variances appear,..
18
19 Int J Radiat Oncol Biol Phys Mar 15;67(4):972-5 Four neuroradiologists Four radiation oncologists Contoured GTV on 20 laryngeal cancer CT images One to one comparison of concordance
20 Degree of GTV Agreement Range from 0% to 81.8% Average /- 3.8%
21 Variations in CTV Target Delineation for Head and Neck IMRT Theodore S. Hong, Wolfgang A. Tomé, Richard J. Chappell, Paul M. Harari University of Wisconsin Department of Human Oncology An International Survey 20 institutions H&N IMRT Practice Heterogeneity Courtesy of Dr. Harari
22 Local failure in RTOG-0022 protocol variations 4 of 53 patients with evaluable plans had major protocol variations due to underdose of PTV66. Local recurrence: 2/4 (50%) patients with major PTV66 variation (underdose) 3/49 (6%) patients without major PTV66 variations P=0.04
23 54 Gy 60 Gy GTV PTV66 Underdose 66 Gy PTV54 Outcome: Local recurrence Treatment plan of a patient with a major PTV66 underdose
24 Phase III Registration Trial TROG (HeadSTART( HeadSTART) Patients with Stage III or IV SCCHN (stratified by stage, site, hemoglobin) Randomization Cisplatin, RT Tirapazamine, cisplatin, RT Courtesy of Dr. Lester Peters
25
26 RT Volume Variation Adversely Impacts Tumor Control Patients who had received at least 60Gy of RT to PTV2 100 Estimated percentage locoregional failure-free P < compliant plan by TMC no adv impact adv impact Years following end of radiotherapy
27 Advanced Knowledge-based Intelligent Tool
28 IJROBP 68: , 2007
29 Knowledge-based Computer-assisted Target Delineation Contouring from scratch Computer-assisted Contouring
30
31 Target Delineation and Dose Spec in 2010 Definitive CTV1 CTV2 CTV3 CTV1 IMRT 70/2.0 63/1.8 56/ fx IMRT 33 fx 70/2.1 60/1.8 54/1.6 GTV 2D 70/2.0 60/2.0 50/ fx Post-op op CTV1 CTV2 CTV3 IMRT 63/2.1 60/2.0 54/1.8 CTV2 CTV3 30 fx 2D 66/2.0 60/2.0 50/ fx T2N1M0 SCC of Base of the Tongue
32 Summary Do no harm with evidence-based guidance Image-pathological study to refine GTV-CTV Bridging knowledge gap
Vincent Grégoire, Radiation Oncologist, Brussels, Belgium Cai Grau, Radiation Oncologist, Aarhus, Denmark. Tunis March 2017
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