암으로 수술을 받은 104명의 환자를 대상으로 수술 후 암의 재발 판정을 위하여 FDG PET를 시행하였다. 대상환자는 뇌종양 14명, 두경부 암 15명, 부인과 암 23명, 소화기계 암 16명, 갑상선 암 16명, 기타 암 20명이었다. 기존의 방사선학적 검사법인 CT, MRI 등을 함께 시행하였고 종양표지자를 측정하여 PET소견과 비교하였다. 재발유무를 조직검사나 임상 경과 관찰에 의하여 판정하였다. FDG PET는 암의 재발 판정에 있어서 94%의 예민도와 92%의 특이도를 보여주었다. CT나 MRI 등 기존의 방사선학적 진단법의 예민도는 78%, 특이도는 68% 이었으며 대장암, 난소암, 갑상선암에서 측정된 종양표지자는 예민도 71%, 특이도 84%를 보였다. 난소암 등 부인과암과 뇌종양에서 특히 PET는 다른 진단법에서보다 높은 진단 능력을 보여 주었다. 전신 FDG PET는 암의 재발 판정을 위해 유용하게 이용될 수 있을 것으로 생각한다.
The purpose of this study was to evaluate the usefulness of whole body F-18 FDG PET scan for detecting postoperative recurrence of cancer. One hundred four cancer patients after operation were enrolled(14 brain tumor, 15 head and neck cancer, 23 gynecologic cancer, 16 gastrointestinal cancer, 16 thyroid cancer, and 20 other cancers). Besides conventional images(CI) including CT and MRI, F-18 FDG PET scan was obtained on ECAT EXACT 47 scanner(Siemens-CTI), beginning 60 minutes after injection of 370MBq(10mCi) of F-18 FDG. Regional scan was also obtained with emission image. Transmission images using Ge-68 were carried out for attenuation correction in both whole body and regional images. Findings of PET, and CI were confirmed by pathology or clinical follow up. The sensitivity and specificity of PET for detecting recurrence were 94% and 92%, respectively. Contrarily, the sensitivity and specificity of CI were 78% and 68%. CI results were negative and PET results were positive in 11 cases. The biopsy or clinical follow-up of those cases confirmed recurrence of tumor. False negative cases of CI were frequent in patients with gynecologic cancers. Also we measured the serum concentration of tumor markers in patients with gynecologic cancer(CA125), thyroid cancer(thyroglobulin), and colorectal cancer(CEA). The sensitivity and specificity of tumor markers were 71% and 84%, respectively, We conclude that F-18 FDG PET can be used valuably in detecting recurrent foci of a wide variety of malignancy compared to conventional diagnostic methods.
