RT Journal Article
SR Electronic
T1 Dose Painting in Radiotherapy for Head and Neck Squamous Cell Carcinoma: Value of Repeated Functional Imaging with <sup>18</sup>F-FDG PET, <sup>18</sup>F-Fluoromisonidazole PET, Diffusion-Weighted MRI, and Dynamic Contrast-Enhanced MRI
JF Journal of Nuclear Medicine
JO J Nucl Med
FD Society of Nuclear Medicine
SP 1020
OP 1027
DO 10.2967/jnumed.109.062638
VO 50
IS 7
A1 Piet Dirix
A1 Vincent Vandecaveye
A1 Frederik De Keyzer
A1 Sigrid Stroobants
A1 Robert Hermans
A1 Sandra Nuyts
YR 2009
UL http://jnm.snmjournals.org/content/50/7/1020.abstract
AB The purpose of this work was to evaluate the potential of functional imaging with 18F-FDG PET, 18F-fluoromisonidazole PET, diffusion-weighted MRI, and dynamic contrast-enhanced MRI to provide an appropriate and reliable biologic target for dose painting in radiotherapy for head and neck squamous cell carcinoma (HNSCC). Methods: Fifteen patients with locally advanced HNSCC, treated with concomitant chemoradiotherapy, were prospectively enrolled in a bioimaging protocol. Sequential PET (18F-FDG and 18F-fluoromisonidazole) and MRI (T1, T2, dynamic enhanced, and diffusion-weighted sequences) were performed before, during, and after radiotherapy. Results: Median follow-up was 30.7 mo (range, 6.3–56.3 mo); in 7 patients, disease recurred. Disease-free survival correlated negatively with the maximum tissue-to-blood 18F-fluoromisonidazole ratio (T/Bmax) on the baseline 18F-fluoromisonidazole scan (P = 0.04), with the size of the initial hypoxic volume (P = 0.04), and with T/Bmax on the 18F-fluoromisonidazole scan during treatment (P = 0.02). All locoregional recurrences were within the 18F-FDG–avid regions on baseline 18F-FDG PET; 3 recurrences mapped outside the hypoxic volume on baseline 18F-fluoromisonidazole PET. Lesions (primary tumor and lymph nodes) where a locoregional recurrence developed during follow-up had significantly lower apparent diffusion coefficients on diffusion-weighted MRI during week 4 of radiotherapy (0.0013 vs. 0.0018 mm2/s, P = 0.01) and at 3 wk after treatment (0.0014 vs. 0.0018 mm2/s, P = 0.01) and a significantly higher initial slope on baseline dynamic enhanced MRI (26.2 vs. 17.5/s, P = 0.03) than did lesions that remained controlled. Conclusion: These results confirm the added value of 18F-FDG PET and 18F-fluoromisonidazole PET for radiotherapy planning of HNSCC and suggest the potential of diffusion-weighted and dynamic enhanced MRI for dose painting and early response assessment.