Assessment of outcomes with delayed (18)F-FDG PET-CT response assessment in head and neck squamous cell carcinoma

F Slevin, Manil Subesinghe, S Ramasamy, Mehmet Sen, A F Scarsbrook, R J D Prestwich

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34 Citations (Scopus)

Abstract

OBJECTIVE: To assess the accuracy of a 4-month post-(chemo)radiotherapy 18-fludeoxyglucose ((18)F-FDG) positron emission tomography (PET)-CT for head and neck squamous cell carcinoma (HNSCC).

METHODS: 105 patients who underwent a baseline and response assessment (18)F-FDG PET-CT scan between 2008 and April 2013 were identified. (18)F-FDG PET-CT outcomes were analysed with reference to clinicopathological outcomes.

RESULTS: 79 of 105 (75%) (18)F-FDG PET-CT scans demonstrated a complete metabolic response; 19 of 101 (19%) for assessable primary tumours were positive; and 19 of 93 (20%) for patients with nodal disease were equivocal (n = 10) or positive (n = 9). The sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) for primary and nodal disease were 90%, 89%, 47%, 99% and 91%, 89%, 53% and 99%, respectively. Eight of nine patients with a positive nodal response scan had clinicopathological evidence of residual nodal disease (PPV, 89%). 2 of 10 patients with equivocal nodal responses had clinicopathological evidence of residual nodal disease (PPV, 20%).

CONCLUSION: (18)F-FDG PET-CT 4 months post treatment has a very high NPV. A positive (18)F-FDG PET-CT has a high PPV for residual nodal disease. By contrast, patients who have an equivocal nodal response have a low PPV.

ADVANCES IN KNOWLEDGE: Response assessment (18)F-FDG PET-CT is a valuable tool in guiding the selective use of neck dissection following (chemo)radiotherapy for HNSCC. An equivocal lymph node response has a limited predictive value for persistent disease, and optimal management remains a clinical challenge.

Original languageEnglish
Pages (from-to)20140592
JournalBritish Journal of Radiology
Volume88
Issue number1052
Early online date8 Jul 2015
DOIs
Publication statusPublished - Aug 2015

Keywords

  • Adult
  • Aged
  • Antineoplastic Combined Chemotherapy Protocols
  • Carboplatin
  • Carcinoma, Squamous Cell
  • Chemoradiotherapy
  • Cisplatin
  • Female
  • Fluorodeoxyglucose F18
  • Head and Neck Neoplasms
  • Humans
  • Male
  • Middle Aged
  • Positron-Emission Tomography
  • Radiopharmaceuticals
  • Retrospective Studies
  • Sensitivity and Specificity
  • Tomography, X-Ray Computed
  • Treatment Outcome
  • Evaluation Studies
  • Journal Article

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