Hepatocellular carcinoma (HCC) is a leading cause of cancer-related mortality worldwide. Early detection via surveillance plays a crucial role in enabling curative treatment and improving survival rates. Since the initial randomized controlled trial, biannual ultrasound (US) has been established as the standard surveillance method because of its accessibility, safety, and low cost. However, US has some limitations, including operator dependency, suboptimal sensitivity for early-stage HCC, and challenges such as a limited sonic window that may result in inadequate examination. Alternative imaging modalities, including contrast-enhanced computed tomography (CT) and magnetic resonance imaging (MRI), have demonstrated higher sensitivity for detecting very early-stage HCC. Recent advancements, such as low-dose CT with deep learning-based reconstruction, have enhanced the safety and feasibility of CT-based surveillance by reducing radiation exposure and amount of contrast media. MRI, particularly with gadoxetic acid or abbreviated protocols, offers superior tissue contrast and sensitivity, although its accessibility and cost remain challenges. Tailored surveillance strategies based on individual risk profiles and integration of advanced imaging technologies have the potential to enhance the detection performance and cost-effectiveness. This review highlights the recent developments in imaging technologies for HCC surveillance, focusing on their respective strengths and limitations.
Sun Hong Yoo, Soon Sun Kim, Sang Gyune Kim, Jung Hyun Kwon, Han-Ah Lee, Yeon Seok Seo, Young Kul Jung, Hyung Joon Yim, Do Seon Song, Seong Hee Kang, Moon Young Kim, Young-Hwan Ahn, Jieun Han, Young Seok Kim, Young Chang, Soung Won Jeong, Jae Young Jang, Jeong-Ju Yoo
J Liver Cancer. 2023;23(1):189-201. Published online March 24, 2023
Background/Aim Abdominal ultrasonography (USG) is recommended as a surveillance test for high-risk groups for hepatocellular carcinoma (HCC). This study aimed to analyze the current status of the national cancer surveillance program for HCC in South Korea and investigate the effects of patient-, physician-, and machine-related factors on HCC detection sensitivity.
Methods This multicenter retrospective cohort study collected surveillance USG data from the high-risk group for HCC (liver cirrhosis or chronic hepatitis B or C >40 years of age) at eight South Korean tertiary hospitals in 2017.
Results In 2017, 45 experienced hepatologists or radiologists performed 8,512 USG examinations. The physicians had a mean 15.0±8.3 years of experience; more hepatologists (61.4%) than radiologists (38.6%) participated. Each USG scan took a mean 12.2±3.4 minutes. The HCC detection rate by surveillance USG was 0.3% (n=23). Over 27 months of follow-up, an additional 135 patients (0.7%) developed new HCC. The patients were classified into three groups based on timing of HCC diagnosis since the 1st surveillance USG, and no significant intergroup difference in HCC characteristics was noted. HCC detection was significantly associated with patient-related factors, such as old age and advanced fibrosis, but not with physician- or machine-related factors.
Conclusions This is the first study of the current status of USG as a surveillance method for HCC at tertiary hospitals in South Korea. It is necessary to develop quality indicators and quality assessment procedures for USG to improve the detection rate of HCC.
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In Asian countries favoring loco-regional treatment such as surgical resection or ablation, very early-stage hepatocellular carcinoma (HCC) should be the main target for surveillance. Even though ultrasound (US) has been accepted as a primary imaging modality for HCC surveillance, its performance in detecting very early-stage HCCs is insufficient. Moreover, in more than 20% of patients at high risk for HCC, visualization of the liver on US may be limited owing to the advanced distortion and heterogeneity of the liver parenchyma. Recently revised HCC clinical guidelines allow the use of alternative surveillance tools including computed tomography or magnetic resonance imaging in patients with inadequate US exams. This paper summarizes the findings of recent studies using imaging modalities other than US as surveillance tools for HCC as well as strengths and limitations of these modalities.
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Background/Aims The National Liver Cancer Screening Program (NLCSP) has been implemented for the past 15 years in Korea. However, the actual clinical experience in Korea is inconsistent with the expectations of the hepatocellular carcinoma (HCC) surveillance program. To evaluate the actual clinical situation of HCC diagnoses, we investigated disease severity in patients with HCC and the diagnostic environment.
Methods From January 2011 to December 2015, all patients who were diagnosed with HCC in a single secondary hospital in Daejeon city were retrospectively enrolled in this study. Severity of HCC was evaluated according to the Barcelona Clinic Liver Cancer (BCLC) staging system.
Results Over the course of 5 years, 298 participants were enrolled. The mean age of participants was 64.0 years. Positive hepatitis B surface antigen was confirmed in 134 patients (45.0%), 35 patients (11.7%) tested positive for anti-hepatitis C virus antibody, and 93 patients (32.2%) had more than 40 g/day of alcohol consumption. The proportions of patients according to BCLC stages were as follows: BCLC-0, 28 patients (9.4%); BCLC-A, 42 patients (14.1%); BCLC-B, 26 patients (8.7%); BCLC-C, 134 patients (45.0%); and BCLC-D, 68 patients (22.8%). The diagnostic environments were as follows: 19 patients were in the NLCSP group (6.4%), 114 in the group with presenting signs (38.3%), 110 in the regular outpatient care group (36.9%), and 55 patients in the incidental diagnosis group (18.5%).
Conclusions Most patients (67.8%) had advanced stage HCC at diagnosis, and curative treatment was not indicated due to the severity disease. Thus, the actual situation is far worse than the theoretical expectation of HCC surveillance, suggesting that many high-risk patients for HCC are missed in surveillance.
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Hepatocellular carcinoma (HCC) is the third most common cancer in the digestive system based on survey of domestic cancer incidence, and the ratio of elderly aged 65 or older is expected to rise steadily, leading to a higher incidence of total hepatocellular carcinoma. The most important thing in treating these older patients with HCC is to assess the benefits and risks of the treatment in advance.
In other words, the benefit of treatment should be greater than the reduction of survival period or maladjustment due to treatment. Based on these perspectives, we examined how the detailed treatment of hepatocellular carcinoma differs from that of general treatment in elderly patients. In conclusion, older age was not a definite prognostic factor of survival risk-benefit comparison in the most treatment modalities. However it should be carefully considered and approached about possible complications in treating HCC in elderly patients.
Hepatocellular carcinoma (HCC) is the fifth most common cancer and the third leading cause of cancer death worldwide. HCC is a suitable disease for surveillance programs because it is relatively common in patients with chronic liver disease, and has very good prognosis if diagnosed at an early stage. When HCC presents with clinical symptoms, the tumor is typically very far advanced and the patient has few therapeutic options. Individuals with chronic viral hepatitis and other forms of liver disease are at risk for developing HCC. Thus, screening and surveillance for HCC would appear to be very appropriate. However, there is no definitive evidence that surveillance improves patient outcomes and the current surveillance tests have less than optimal sensitivity, specificity and accuracy. Nonetheless, measurement of alpha-fetoprotein levels in serum and ultrasound of the liver have become routine practice in many countries, despite a lack of evidence of their overall benefit. Clearly, better methods are needed for early diagnosis of HCC. This review outlines the target population at risk for HCC and diagnostic techniques for screening and surveillance.
HCC is an appropriate cancer to apply surveillance program for early cancer detection. Currently, liver ultrasonography (US)
combined with serum biomarker, alpha‐fetoprotein (AFP), measurement every 6 months is the standard method of HCC
surveillance. Although US is the most widely used tool, its sensitivity in early HCC (within Milan criteria) detection during
surveillance is only 63%. AFP is the representative biomarker for both HCC surveillance and diagnosis. The unsatisfactory
performance of AFP as a surveillance tool requires discovery of novel biomarker or combination with other serum markers. Desgamma‐
carboxy prothrombin (DCP) and AFP‐L3 are candidate biomarkers which are complementary to AFP. AFP‐L3 is an
emerging biomarker for diagnosis of HCC, but it needs to be validated as a surveillance tool. Regarding surveillance interval, 6
months or less seems to be superior to more longer interval in terms of early HCC detection and survival improvement. The
strategies of HCC surveillance are different in countries according to health care system including available resources and health
insurance coverage. Many studies demonstrated that rate of early cancer detection and application of curative therapies was
increased, along with survival benefit, by HCC surveillance which is now the standard care, not just a recommendation.
Improved ultrasound technology and biomarker discovery such as a specific microRNA are necessary to make more progress in
HCC surveillance.