{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,14]],"date-time":"2026-07-14T18:53:36Z","timestamp":1784055216646,"version":"3.55.0"},"reference-count":15,"publisher":"Wiley","issue":"15","license":[{"start":{"date-parts":[[2021,6,22]],"date-time":"2021-06-22T00:00:00Z","timestamp":1624320000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Cancer Medicine"],"published-print":{"date-parts":[[2021,8]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>Anatomical variations in head and neck cancer during IMRT leads to volume shrinkage, results in dosimetric variations in tumour and normal tissue including parotid glands, with a risk of radiation toxicities.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>30 patients with a stage II\u2013IV head and neck squamous cell carcinoma (HNSCC) were treated with definitive IMRT\u2010SIB and concomitant chemotherapy. Volumetric and dosimetric variations were evaluated during the period of IMRT by recalculating and obtaining dose\u2010volume histograms of re\u2010contoured target volumes and parotid glands on repeat CT scans taken multiple times during treatment (CT1, CT2, CT3 and CT4).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Result showed significant (<jats:italic>p\u00a0<\/jats:italic>&lt;\u00a00.001) mean decrease in both primary and nodal tumors volume with time whereas increase (<jats:italic>p\u00a0<\/jats:italic>&lt;\u00a00.01 or <jats:italic>p\u00a0<\/jats:italic>&lt;\u00a00.001) in respective V100 (%) and D2% (Gy). The mean parotid gland dose increased (<jats:italic>p\u00a0<\/jats:italic>&lt;\u00a00.01 or <jats:italic>p\u00a0<\/jats:italic>&lt;\u00a00.001) with time, whereas parotid gland volume and distance between plan isocenter and centre of mass of parotid glands decreased (<jats:italic>p\u00a0<\/jats:italic>&lt;\u00a00.05 or <jats:italic>p\u00a0<\/jats:italic>&lt;\u00a00.001) with time. Patient's mean weight and neck circumference both decrease (<jats:italic>p\u00a0<\/jats:italic>&lt;\u00a00.001) with time whereas ECOG score increase (<jats:italic>p\u00a0<\/jats:italic>&lt;\u00a00.001) with time. The mucosal toxicity increased significantly (<jats:italic>p\u00a0<\/jats:italic>&lt;\u00a00.001) with time. The change in both weight and neck circumference showed significant (<jats:italic>p\u00a0<\/jats:italic>&lt;\u00a00.001) and direct (positive correlation) association with change in parotid gland volume.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>If the PTV and normal anatomy are changing with time, adaptive IMRT would be beneficial radiation dose delivery where possible.<\/jats:p><\/jats:sec>","DOI":"10.1002\/cam4.4079","type":"journal-article","created":{"date-parts":[[2021,6,23]],"date-time":"2021-06-23T06:21:16Z","timestamp":1624429276000},"page":"5175-5190","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["A Study to Assess the Dosimetric Impact of the Anatomical Changes Occurring in the Parotid Glands and Tumour Volume during Intensity Modulated Radiotherapy using Simultaneous Integrated Boost (IMRT\u2010SIB) in Head and Neck Squamous Cell Cancers"],"prefix":"10.1002","volume":"10","author":[{"given":"Arunima","family":"Ghosh","sequence":"first","affiliation":[{"name":"Department of Radiotherapy King George\u2019s Medical University Uttar Pradesh Lucknow India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4007-8147","authenticated-orcid":false,"given":"Seema","family":"Gupta","sequence":"additional","affiliation":[{"name":"Department of Radiotherapy King George\u2019s Medical University Uttar Pradesh Lucknow India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Danial","family":"Johny","sequence":"additional","affiliation":[{"name":"Department of Radiotherapy King George\u2019s Medical University Uttar Pradesh Lucknow India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vivek","family":"Vidyadhar Bhosale","sequence":"additional","affiliation":[{"name":"Toxicology and Experimental Medicine Division CSIR\u2010Central Drug Research Institute Lucknow India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mahendra","family":"Pal Singh Negi","sequence":"additional","affiliation":[{"name":"Toxicology and Experimental Medicine Division CSIR\u2010Central Drug Research Institute Lucknow India"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2021,6,22]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1102\/1470-7330.2004.0003"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijrobp.2003.12.024"},{"issue":"2","key":"e_1_2_10_4_1","first-page":"189","article-title":"The necessity of replanning during the intensity\u2010modulated radiotherapy (IMRT) for head and neck cancer, to ensure adequate coverage of target volume","volume":"8","author":"Naveen BS","year":"2020","journal-title":"Int J Med Res 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