Abstract
Colorectal cancer is the third most common neoplastic disease (50–60% overall survival at 5 years); 90–95% of colorectal cancers are adenocarcinoma. In addition to whether the tumor is well differentiated or poorly differentiated histologically, the extent of the primary tumor at diagnosis, expressed by local and lymph node invasion, is the most important prognostic factor. Two staging classifications for colorectal cancer are available [Dukes’ classification and the TNM stage system by the American Joint Committee on Cancer/International Union Against Cancer (AJCC/UICC)].
Contrast-enhanced computed tomography (CECT) of the chest, abdomen, and pelvis is used in pretreatment staging. Because of the high incidence of disease recurrence (30–40%), morphological imaging (CT, abdominal ultrasound) and serial measurements of serum markers [carcinoembryonic antigen (CEA)] are used in the follow-up. The use of [18F]FDG-PET for early detection of primary colorectal cancer is limited due to the low sensitivity for small tumors and the low sensitivity for mucinous lesions. False-positive PET findings are also reported in patients with inflammatory bowel disease (IBD) or previous diagnostic polipectomy. Although [18F]FDG PET is more sensitive than CT in detecting regional lymph node involvement, CT is better at detecting liver metastases. As a result, the role of [18F]FDG PET-CT for presurgical staging is unclear. [18F]FDG-PET is useful as a complementary exam in selected patients with a high metastatic potential.
During restaging and follow-up whole body [18F]FDG-PET is recommended to localize recurrent disease in cases of elevated serum CEA and negative morphological imaging findings or indeterminate lesions at conventional morphological imaging. Combined PET/CT tomography improved the accuracy of the evaluation of colorectal cancer, especially in the visualization of abdomino-pelvic extrahepatic disease.
[18F]FDG-PET may be useful to evaluate response to chemotherapy, although the optimum timing of the assessment of metabolic response remains unsettled. Moreover, new drugs targeted to angiogenesis or tyrosine kinase have opened new frontiers to the use of [18F]FDG-PET in evaluating response because of their cytostatic rather than cytoreductive effect. Evaluation of response to radiotherapy in rectal cancer, that may be very difficult by anatomic imaging alone because residual tissue persists after irradiation, can be done by [18F]FDG-PET which can detect residual active disease and assess complete/incomplete metabolic response. Finally, [18F]FDG-PET has been proposed in the evaluation of response to local treatment of liver and lung metastases by radiofrequency ablation (RFA). In unresectable liver metastases and advanced liver burden, radioembolization treatment with microspheres labeled with 90Y is becoming a valid alternative to chemoembolization and RFA.
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Pelosi, E., Deandreis, D. (2013). Colorectal Cancer. In: Strauss, H., Mariani, G., Volterrani, D., Larson, S. (eds) Nuclear Oncology. Springer, New York, NY. https://doi.org/10.1007/978-0-387-48894-3_19
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