alexa A Prospective Study to Evaluate Clinical Radiation Induced Pneumonitis in Lung Cancer Patients and its Dose Response Relationship with Radiotherapy

Journal of Lung Cancer Diagnosis & Treatment
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Review Article

A Prospective Study to Evaluate Clinical Radiation Induced Pneumonitis in Lung Cancer Patients and its Dose Response Relationship with Radiotherapy

Sayan Das1, Shagun Misra2, Anusheel Munshi3, Shrinivas Rathod4, Nilendu Purandare1, Sandeep Tandon1 and Jai Prakash Agarwal1*

1Department of Radiation Oncology, Tata Memorial Hospital, Mumbai, India

2Department of Radiation Oncology, SGPGI, Lucknow, India

3Department of Radiation Oncology, Fortis Memorial Cancer Centre, Gurgaon, India

4Department of Radiation Oncology, Princess Margaret Cancer Centre, Toronto, USA

Corresponding Author:
Jai Prakash Agarwal
Department of Radiation Oncology, Homi Bhaba Block
Tata Memorial Hospital, Mumbai-400012, India
Tel: +91 - 22 –24177164
Fax: +91- 22- 24146937
E-mail: [email protected]

Received Date: December 14, 2015; Accepted Date: January 25, 2016; Published Date: February 01, 2016

Citation: Das S, Misra S, Munshi A, Rathod S, Purandare N, et al. (2016) A Prospective Study to Evaluate Clinical Radiation Induced Pneumonitis in Lung Cancer Patients and its Dose Response Relationship with Radiotherapy. J Lung Cancer Diagn Treat 1:101. doi:10.4172/jlcdt.1000101

Copyright: © 2016 Das S, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Purpose: This study was initiated to evaluate incidence, grade and dosimetric correlation of Clinical Radiation Induced Pneumonitis (RIP) (≥ grade 2) in lung cancer patients undergoing radical radiotherapy.
Methods and Materials: From August, 2012 to November, 2013, 85 lung cancer patients received curative 3D CRT. On follow up 14 patients developed symptomatic pneumonitis (≥ Grade 2 as per RTOG Toxicity criteria). They underwent CT thorax/PET-CT at 3 monthly follow-up which were co-registered with planning CT images. Changes in lung density were graded as patchy, discrete and solid consolidation and contoured. Isodose surface enveloping these contours and mean doses received were noted.
Result: At a median follow up of 12.5 months, incidence of clinical ≥Grade 2 RIP was 16.5%. Inclusion of mediastinum in the target volume and higher stage of disease were found to be indicators of increased risk of ≥Grade 2 RIP. Lung volumes showing patchy/discrete consolidation decreased from 3rd to 6th month and then plateaued while solid consolidation appeared at 6 months, increased at 9 months but then decreased at 12 months. Percentage isodoses encompassing grade 2 radiological RIP were between 80-85% and mean doses were between 45-48Gy. However for grade 3/4 RIP corresponding values were 90-95% and 50-54Gy.
Conclusion: Incidence of ≥Grade 2 RIP with conformal RT was 16.5%. V20 alone may not be a sufficient predictor for RIP and one should consider conformal RT planning to restrict even higher isodoses beyond the PTV.
 

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