Advantage of FMISO-PET over FDG-PET for predicting histological response to preoperative chemotherapy in patients with oral squamous cell carcinoma

作者：Sato Jun^*; Kitagawa Yoshimasa; Yamazaki Yutaka; Hata Hironobu; Asaka Takuya; Miyakoshi Masaaki; Okamoto Shozo; Shiga Tohru; Shindoh Masanobu; Kuge Yuji; Tamaki Nagara

来源：European Journal of Nuclear Medicine and Molecular Imaging, 2014, 41(11): 2031-2041.

DOI：10.1007/s00259-014-2810-y

• Hypoxia
• FMISO-PET
• FDG-PET
• Preoperative chemotherapy
• HIF-1 alpha
• Oral squamous cell carcinoma

Purpose Hypoxia, a prognostic factor in many types of cancer, can be detected by F-18-fluoromisonidazole (FMISO) positron emission tomography (PET). It is unclear whether hypoxia reflects the response to chemotherapy in patients with oral squamous cell carcinoma (OSCC). The correlations of FMISO-PET and FDG-PET with histological response to preoperative chemotherapy were therefore assessed in patients with OSCC. %26lt;br%26gt;Methods This study enrolled 22 patients with OSCC undergoing preoperative chemotherapy. The T-stages were T2 in 6 patients, T3 in 3, and T4a in 13, and the N-stages were N0 in 14 patients, N1 in 3, and N2 in 5. Each patient was evaluated by both FMISO-PET and FDG-PET before surgery, and the maximum standardized uptake value (SUVmax) of FDG- and FMISO-PET and tumor-muscle ratio (TMR) of FMISO-PET were measured. The threshold for the hypoxic volume based on TMR was set at 1.25. The histological response to preoperative chemotherapy was evaluated using operative materials. %26lt;br%26gt;Results FMISO-PET and FDG-PET detected uptake by primary OSCCs in 15 (68%) and 21 (95%) patients, respectively, and median SUV(max)s of FMISO- and FDG-PET in the primary site were 2.0 (range, 1.3-3.5) and 16.0 (range, 1.0-32.2), respectively. The median of FMISO TMR was 1.5 (range, 0.99-2.96). There were five cases whose FMISO TMR was less than 1.25. Histological evaluation showed good response to preoperative chemotherapy in 7 patients (32%) and poor response in 15 (68%). Good response was significantly more prevalent in patients with negative than positive FMISO uptake (P%26lt;0.001) and without the hypoxic area evaluated by FMISO-PET TMR (P=0.04), whereas FDG uptake was not significantly correlated with response to chemotherapy response. Multivariate logistic regression analysis showed that FMISO uptake was an independent significant predictor of response to preoperative chemotherapy (P=0.03, odds ratio=0.06, 95% confidence interval=0.004-0.759). %26lt;br%26gt;Conclusions An advantage of FMISO-PET over FDG-PET for predicting histological response to preoperative chemotherapy in patients with OSCC was observed.

• 出版日期2014-11