Patterns of local-regional failure after primary intensity modulated radiotherapy for nasopharyngeal carcinoma View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2014-02-19

AUTHORS

Fangfang Kong, Hongmei Ying, Chengrun Du, Shuang Huang, Junjun Zhou, Junchao Chen, Lining Sun, Xiaohui Chen, Chaosu Hu

ABSTRACT

BACKGROUND: To analyze patterns of local-regional failure after primary intensity modulated radiotherapy (IMRT) for nasopharyngeal carcinoma (NPC). METHODS: A total of 370 non-metastatic NPC patients consecutively treated with IMRT (with or without chemotherapy) were analyzed. Radiotherapy was administered using a simultaneous integrated boost (SIB) technique at the total prescribed dose of 66-70.4 Gy (2.0-2.2 Gy per fraction). The location and extent of local-regional failures were transferred to the pretreatment planning computed tomography (CT) for dosimetric analysis. The dose of radiation received by V(recur) (volume of recurrence) was calculated and analyzed with dose-volume histogram (DVH). Failures were classified as: "in field" if 95% of V(recur) was within the 95% isodose, "marginal" if 20% to 95% of V(recur) was within the 95% isodose, or "outside" if less than 20% of V(recur) was inside the 95% isodose. RESULTS: With a median follow up of 26 months, 25 local-regional failures were found in 18 patients. The 1- and 2-year actuarial local-regional control rates for all patients were 99.7% and 95.5% respectively. Among the 22 local-regional failures with available diagnostic images, 16 (64%) occurred within the 95% isodose lines and were considered in-field failures; 3 (12%) were marginal and 3 (12%) were outside-field failures. CONCLUSIONS: Intensity-modulated radiotherapy provides excellent local-regional control for NPC. In-field failures are the main patterns for local-regional recurrence. Reducing the coverage of critical adjacent tissues in CTV purposefully for potential subclinical diseases was worth of study. Great attention in all IMRT steps is necessary to reduce potential causes of marginal failures. More studies about radioresistance are needed to reduce in-field failures. More... »

PAGES

60-60

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/1748-717x-9-60

DOI

http://dx.doi.org/10.1186/1748-717x-9-60

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1037940585

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/24552293


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