Chang Moo Kang1, Arthur Cho2, Hyunki Kim3, Young Eun Chung2, Ho Kyoung Hwang4, Sung Hoon Choi5, Woo Jung Lee6. 1. Department of Surgery, Yonsei University College of Medicine Pancreaticobiliary Cancer Clinic, Institute of Gastroenterology, Severance Hospital, Seoul, Republic of Korea. Electronic address: cmkang@yuhs.ac. 2. Department of Radiology, Yonsei University College of Medicine Pancreaticobiliary Cancer Clinic, Institute of Gastroenterology, Severance Hospital, Seoul, Republic of Korea. 3. Department of Pathology, Yonsei University College of Medicine Pancreaticobiliary Cancer Clinic, Institute of Gastroenterology, Severance Hospital, Seoul, Republic of Korea. 4. Department of Surgery, Yonsei University College of Medicine Pancreaticobiliary Cancer Clinic, Institute of Gastroenterology, Severance Hospital, Seoul, Republic of Korea. 5. Department of Surgery, Bundang CHA Hospital, CHA University College of Medicine, Seongnam, Republic of Korea. 6. Department of Surgery, Yonsei University College of Medicine Pancreaticobiliary Cancer Clinic, Institute of Gastroenterology, Severance Hospital, Seoul, Republic of Korea. Electronic address: wjlee@yuhs.ac.
Abstract
BACKGROUND: There are limited numbers of PET studies of solid pseudopapillary tumors (SPT) of the pancreas. MATERIALS AND METHODS: We reviewed the medical records of 37 patients who underwent resection of pancreatic SPT and had been preoperatively evaluated by (18)F-FDG PET or PET/CT scan. Immunohistochemical analysis of glucose transporter-1 (GLUT-1) and hexokinase II (HK-II) was performed. RESULTS: SPT could be categorized into five types according to the morphologic characteristics observed in PET images. Type I (hot FDG uptake in the entire tumor portion) was the most frequent (13, 34.2%), followed by type IV (focal uptake, 12, 31.6%), II (focal defect, 8, 21.1%), III (multiple and geographic uptake, 3, 7.9%), and V (total defective type, 1, 2.6%). The SUVmax in the solid portion of the SPT was 5.3 ± 4.1. The clinical pattern of FDG uptake in SPT was not associated with histopathologic features suggesting malignant potential. The SUVmax of SPT followed a pattern according to pattern of FDG uptake (R(2) = 0.203, p = 0.055), and was significantly associated with adjusted tumor volume (p = 0.001). GLUT-1 was not expressed in SPT, and only eight patients (12.3%) showed mild to moderate expression of HK-II, which was associated with the clinical pattern of SPT in PET images (p < 0.05). CONCLUSION: SPT of the pancreas could be categorized according to the morphologic patterns observed in PET images. The clinical significance of FDG uptake, glucose metabolism, and clinical usefulness of PET scan in SPT need to be further investigated, and thus this tumor remains a surgical enigma.
BACKGROUND: There are limited numbers of PET studies of solid pseudopapillary tumors (SPT) of the pancreas. MATERIALS AND METHODS: We reviewed the medical records of 37 patients who underwent resection of pancreatic SPT and had been preoperatively evaluated by (18)F-FDG PET or PET/CT scan. Immunohistochemical analysis of glucose transporter-1 (GLUT-1) and hexokinase II (HK-II) was performed. RESULTS: SPT could be categorized into five types according to the morphologic characteristics observed in PET images. Type I (hot FDG uptake in the entire tumor portion) was the most frequent (13, 34.2%), followed by type IV (focal uptake, 12, 31.6%), II (focal defect, 8, 21.1%), III (multiple and geographic uptake, 3, 7.9%), and V (total defective type, 1, 2.6%). The SUVmax in the solid portion of the SPT was 5.3 ± 4.1. The clinical pattern of FDG uptake in SPT was not associated with histopathologic features suggesting malignant potential. The SUVmax of SPT followed a pattern according to pattern of FDG uptake (R(2) = 0.203, p = 0.055), and was significantly associated with adjusted tumor volume (p = 0.001). GLUT-1 was not expressed in SPT, and only eight patients (12.3%) showed mild to moderate expression of HK-II, which was associated with the clinical pattern of SPT in PET images (p < 0.05). CONCLUSION: SPT of the pancreas could be categorized according to the morphologic patterns observed in PET images. The clinical significance of FDG uptake, glucose metabolism, and clinical usefulness of PET scan in SPT need to be further investigated, and thus this tumor remains a surgical enigma.
Authors: Emmanuel Ii Uy Hao; Ho Kyung Hwang; Dong-Sub Yoon; Woo Jung Lee; Chang Moo Kang Journal: Medicine (Baltimore) Date: 2018-12 Impact factor: 1.817