Yin JX, Fan X, Chen QL, Chen J, He J. Progress in the application of fludeoxyglucose positron emission tomography computed tomography in biliary tract cancer. World J Hepatol 2025; 17(5): 105446 [PMID: 40501462 DOI: 10.4254/wjh.v17.i5.105446]
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02905103
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June 02, 2025, 11:14
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Reader Comments:
This review article is a really helpful and up-to-date look at how PET/CT scans using FDG are used for bile duct cancer (BTC). The authors do a great job pulling together the latest research, especially focusing on the past three years. They carefully examine how well PET/CT works for the different types of BTC – like cancers inside the liver (ICC), near the liver's exit (PCC), further down the bile duct (DCC), and gallbladder cancer (GBC). This breakdown is important because each type behaves differently.
A key point the review makes is comparing PET/CT to standard scans like CT or MRI. PET/CT is generally better at finding cancer spread to lymph nodes, even if they aren't enlarged, and at spotting distant cancer spread elsewhere in the body. This can be crucial for planning treatment and avoiding unnecessary surgeries. However, the review honestly points out that PET/CT isn't perfect. It can sometimes miss smaller bile duct cancers (especially PCC) or cancers that produce a lot of mucus. It can also give "false alarms" due to inflammation, infection, or the presence of stents.
The article highlights a significant shift happening: moving beyond just looking at the pictures to actually measuring things from the scan. Measurements like how "hot" the cancer appears (SUVmax) or the total amount of active cancer (MTV, TLG) can help doctors predict how aggressive the cancer might be and how long patients might live. Even more exciting is brand new research showing these PET/CT measurements might give clues about the cancer's genetics (like KRAS mutations in ICC) without needing a new biopsy. The review also covers advanced computer analysis of the scans (radiomics and AI), which shows promise in predicting things like how likely the cancer is to invade blood vessels or come back after surgery, especially for ICC.
The authors also touch on the potential of combining PET with MRI (PET/MRI). This newer technology might offer better pictures of the soft tissues around the bile ducts and gallbladder, which could be useful for seeing exactly where the cancer is locally or if it has come back. However, more studies are needed, particularly for gallbladder cancer.
Overall, this is a very valuable summary. It clearly explains where PET/CT is most useful right now for BTC patients – mainly in accurate staging to find hidden spread and guide treatment choices. It also effectively shows where the field is heading: using the scan data more precisely to understand the cancer's biology and predict outcomes, paving the way for more personalized care. The balanced view of both the strengths and weaknesses of PET/CT makes this review practical for doctors and informative for researchers looking at the future of imaging for these difficult cancers.
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