Clinico-Dosimetric Correlation for Acute and Chronic Gastrointestinal Toxicity in Patients of...
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Transcript of Clinico-Dosimetric Correlation for Acute and Chronic Gastrointestinal Toxicity in Patients of...
Clinico-Dosimetric Correlation for Acute and Chronic Clinico-Dosimetric Correlation for Acute and Chronic Gastrointestinal Toxicity in Patients of Locally Advanced Gastrointestinal Toxicity in Patients of Locally Advanced Carcinoma Cervix Treated With Conventional Versus IMRT: Carcinoma Cervix Treated With Conventional Versus IMRT: An Analysis from a Prospective Randomized TrialAn Analysis from a Prospective Randomized Trial
Rath GK1, Gandhi AK1, Sharma DN1, Kumar S2, Julka PK1
1Department of Radiation Oncology, 2Department of Gynecology & Obstetrics, All India Institute of Medical Sciences, New Delhi, India
Session title: GYN; Date/Time: 2014-09-15 10:45Location: Room D-2Monitor number: 5
Introduction• Radiation therapy with conventional technique leads to a acute and
chronic gastrointestinal (GI) toxicity of >20-30% and > 5-10% respectively• Intensity Modulated Radiotherapy (IMRT) has shown to reduce both
acute and chronic GI toxicity with good clinical outcome • We earlier reported1 results of our prospective randomized study
comparing conventional pelvic radiotherapy (CRT) to Intensity modulated radiotherapy (IMRT)
• In our study reported earlier1 ,IMRT arm had significantly fewer acute ≥ Grade 2 GI toxicity (31.8% vs. 63.6%) , ≥ Grade 3 GI toxicity (4.5% vs. 27.3%) as well as lesser chronic gastrointestinal toxicity (13.6% vs. 50%)
1. Gandhi AK, Sharma DN, Rath GK et al. Int J Radiat Oncol Biol Phys. 2013 Nov 1;87(3):542-8
Aims & Statistical Analysis• The purpose of this study is to correlate reported acute and
chronic GI toxicity in our study with Dosimetric parameters.• Acute GI Toxicity: Assessed from start of treatment till 3
months of completion of treatment as per CTCAE (Version 3.0)
• Chronic GI toxicity : Assessed from 6 months after the completion of Brachytherapy until the last follow-up visit as per RTOG late morbidity scoring criteria
• Volume of rectum and small bowel (SB) receiving 40% (V40), 90% (V90) and 100% (V100) of the prescription dose and Volume of SB receiving ≥ 45 Gray (V45) were noted. Bowel loops were contoured as peritoneal cavity and not individually.
Gastrointestinal ToxicityCRT (%) IMRT(%)
Acute ≥ Grade 2 GI Toxicity
63.6 31.8 (p=0.034)
Acute ≥ Grade 3 GI Toxicity
27.3 4.5 (p=0.047)
Chronic ≥ Grade 2 GI Toxicity
18.8 9.09
Chronic ≥ Grade 3 GI Toxicity
13.63 0
Overall GI Toxicity
50 13.6 (p=0.011)
• Mean V90 and V100 of SB in CRT and IMRT arm was 417.54 vs. 194.85 ml and 102.47 vs. 336.22 ml respectively.
• V90, V100 and V45 >180 cc of SB correlated with acute GI toxicity (p=0.04, p=0.031 and p= 0.036) but not with chronic GI toxicity.
• Volume of the rectum did not correlate significantly with either acute or chronic gastrointestinal toxicity.
Conclusion
• IMRT in locally advanced carcinoma cervix (LACC) leads to significantly lesser acute and chronic GI toxicities as compared to Conventional radiotherapy .
• V90, V100 and V45 >180 cc of SB significantly correlates with acute gastrointestinal toxicity in patients of locally advanced carcinoma cervix treated with IMRT and should be used in prospective clinical trials.
• Further follow up is required for assessment of clinic-dosimetric correlation of chronic gastrointestinal toxicity.