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[Diagnostic value of 18F-FDG PET/CT and tumor markers (CEA, CA19-9, CA24-2) in recurrence and metastasis of postoperative colorectal moderately differentiated adenocarcinoma].

PET/CT Updates, Research & Education
March 2020

Purpose

To evaluate the diagnostic value of 18F-FDG PET/CT and tumor markers (CEA,CA19-9,CA24-2) in detection for recurrence and metastasis of postoperative colorectal moderately differentiated adenocarcinoma.

Methods

Fifty-five patients were enrolled in this study. All of the patients were tested with serum CEA within 2 weeks when they underwent 18F-FDG PET/CT scan, and some patients were tested with serum CA19-9 and CA24-2 simultaneously. According to the pathology and clinical results of their follow-up, the sensitivity, specificity, positive predictive value, negative predictive value and accuracy of 18F-FDG PET/CT and tumor markers were calculated based on different divided groups, respectively.

Results

According to the pathology and the results of their clinical follow-up, the sensitivity of 18F-FDG PET/CT, CEA, CA19-9, CA24-2 and the combination of those three tumor markers were 95.74%, 68.09%, 28.57%, 40.00% and 74.47%, respectively. The specificity of 18F-FDG PET/CT, CEA, CA19-9, CA24-2 and the combination of those three tumor markers were 75.00%, 50.00%, 66.67%, 71.43% and 50.00%, respectively. The positive predictive valueof 18F-FDG PET/CT, CEA, CA19-9, CA24-2 and the combination of those three tumor markers were 95.74%, 88.89%, 85.71%, 88.89% and 89.74%, respectively. The negative predictive value of 18F-FDG PET/CT, CEA, CA19-9, CA24-2 and the combination of those three tumor markers were 75.00%, 26.67%, 11.42%, 17.24%, 25.00%, respectively. The accuracy of 18F-FDG PET/CT, CEA, CA19-9, CA24-2 and the combination of those three tumor markers were 92.73%, 65.47%, 32.65%, 44.68% and 70.91%, respectively. There were 2 cases of false positive and 2 cases of false negative in 18F-FDG PET/CT.

Conclusion

18F-FDG PET/CT has high value in detecting recurrence and metastasis of postoperative colorectal carcinoma. Tumor markers have the positive value to imply the recurrence and metastasis of postoperative colorectal carcinoma and are useful to indicate when to perform the 18F-FDG PET/CT. The combination of tumor markers could improve the diagnostic efficiency to some extent.

Source: Beijing Da Xue Xue Bao Yi Xue Ban. 2019 Dec 18;51(6):1071-1077.
< https://www.ncbi.nlm.nih.gov/pubmed/31848507 > Retrieved 9 March 2020.

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March Colorectal Cancer Awareness

  • Excluding skin cancers, colorectal cancer is the third most common cancer diagnosed in both men and women in the United States, with the American Cancer Society estimating 104,610 new cases of colon cancer in 2020.

  • Through advancements in screening and other means of early detection, combined with improvements in treatment, the mortality rate from colorectal cancer has been dropping in both men and women for several decades.

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