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Table 3 Patterns of recurrence according to CTV coverage

From: Definitive intensity modulated radiotherapy in locally advanced hypopharygeal and laryngeal squamous cell carcinoma: mature treatment results and patterns of locoregional failure

Patient Primary tumor Local vs. regional failure Full coverage by CTV54 Marginal coverage by CTV54 Full coverage by CTV66 Marginal coverage by CTV66 Full coverage by CTV72 Marginal coverage by CTV72 Most probable explanation for relapse
1 larynx local Yes No Yes No Yes No radioresistance
2 hypopharynx local Yes No NA NA No Yes underdosage
3 hypopharynx local Yes No Yes No Yes No radioresistance
4 larynx local Yes No Yes No No Yes underdosage
5 larynx local Yes No NA NA Yes No radioresistance
6 hypopharynx regional Yes No No Yes No Yes underdosage
7 larynx local Yes No NA NA Yes No radioresistance
8 larynx local and regional Yes No NA NA Yes No radioresistance
9 hypopharynx local Yes No No Yes No Yes underdosage
10 hypopharynx local Yes No Yes No Yes No radioresistance
  1. Abbreviations: CTV clinical target volume, CTV54 clinical target volume covered by 54Gy, CTV66 clinical target volume covered by 66Gy, CTV72 clinical target volume covered by 72Gy, NA non-applicable.