Publications by authors named "Tan-To Cheung"

Background: Extracellular matrix proteins are tightly linked to cancer progression. HCC frequently arises from chronic liver diseases with varying degrees of parenchymal fibrosis. Herein, we aimed to investigate the roles of secreted lumican, an extracellular matrix proteoglycan, in HCC.

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Objective: This study aimed to establish global benchmark outcomes indicators for robotic liver resections (R-LR).

Background: In recent years, minimally invasive liver resections and in particular R-LR has seen an increase in uptake in recent years. Although, benchmark outcomes have been recently established for laparoscopic (L) -LR, this has not been established for R-LR.

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Objective: To establish benchmark cutoffs for robotic liver resection (R-LR), encompassing both major and minor resections, and to determine the impact of patient selection on outcomes.

Background: R-LR is a key advancement in minimally invasive liver surgery but lacks standardized benchmarks, especially for minor resections. While guidelines endorse R-LR, its role in optimizing outcomes remains unclear.

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A striking characteristic of liver cancer is its extensive heterogeneity, particularly with regard to its varied response to immunotherapy. In this study, we employed multimodal sequencing approaches to explore the various aspects of neoadjuvant nivolumab treatment in liver cancer patients. We used spatially-resolved transcriptomics, single- and bulk-cell transcriptomics, and TCR clonotype analyses to examine the spatiotemporal dynamics of the effects of nivolumab.

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Background And Aim: Portal vein tumor thrombosis (PVTT) is frequent in hepatocellular carcinoma (HCC). Although hepatectomy is the primary treatment for HCC, no consensus exists on its role in PVTT between Eastern and Western clinicians. This study aims to assess the efficacy of hepatectomy in HCC patients with PVTT by analyzing perioperative outcomes and prognosis.

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Background: Baseline viral replication activity influences the risk of hepatocellular carcinoma (HCC) development in patients with chronic hepatitis B virus (HBV) infection.

Aims: To evaluate the impact of baseline viral replication activity on recurrence in HBV-related HCC after curative resection.

Methods: A multinational retrospective cohort of 2384 patients with very early or early-stage HBV-related HCC who consecutively underwent curative resection and received antiviral therapy (AVT) between 2010 and 2018 was analysed.

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Introduction: The Iwate difficulty scoring system (DSS) is one of the most widely validated DSS for laparoscopic liver resection (LLR). However, these studies only validated the 4 difficulty levels and did not validate the 12-point difficulty index of the system. To address current limitations in the studies validating the Iwate difficulty scoring system (DSS), we performed an international multicenter study to validate the Iwate DSS across both its four difficulty levels and 12-point difficulty index.

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Introduction: The global burden of metabolic diseases is increasing, but estimates of their impact on primary liver cancer are uncertain. We aimed to assess the global burden of primary liver cancer attributable to metabolic risk factors, including high body mass index (BMI) and high fasting plasma glucose (FPG) levels, between 1990 and 2021.

Methods: The total number and age-standardized rates of deaths and disability-adjusted life years (DALYs) from primary liver cancer attributable to each metabolic risk factor were extracted from the Global Burden of Disease Study 1990-2021.

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Background And Aims: HCC recurrence frequently occurs after curative surgery. Histological microvascular invasion (MVI) predicts recurrence but cannot provide preoperative prognostication, whereas clinical prediction scores have variable performances.

Approach And Results: Recurr-NET, a multimodal multiphasic residual-network random survival forest deep-learning model incorporating preoperative CT and clinical parameters, was developed to predict HCC recurrence.

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Article Synopsis
  • A study was conducted to compare robotic minor liver resections (RMLR) with laparoscopic minor liver resections (LMLR) in patients undergoing surgery on the anterolateral liver segments.
  • The analysis included over 10,000 patients and employed propensity score matching to balance the groups for accuracy in comparisons.
  • Results indicated RMLR had benefits like less blood loss, lower major morbidity, and shorter hospital stays than LMLR, although the difference in 30-day readmission rates suggested RMLR may have some drawbacks.
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Background & Aims: Combined F-fluorodeoxyglucose (FDG) and C-acetate (dual-tracer) positron-emission tomography/computed tomography (PET/CT) is being increasingly performed for the management of hepatocellular carcinoma (HCC), although its role is not well defined. Therefore, we evaluated its effectiveness in (i) staging, (ii) characterization of indeterminate lesions on conventional imaging, and (iii) detection of HCC in patients with unexplained elevations in serum alpha-fetoprotein (AFP) levels.

Methods: We retrospectively assessed 525 consecutive patients from three tertiary centers between 2014 and 2020.

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Article Synopsis
  • The study aimed to create global benchmark outcome indicators for laparoscopic right posterior sectionectomies (L-RPS/H67) to improve surgical standards.
  • It analyzed data from 854 patients across 57 centers globally, establishing key performance benchmarks for low-risk cases based on specific outcome indicators.
  • The findings set standard benchmarks for metrics like operation time and complication rates, serving as a reference for surgical auditing and improvement.
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Article Synopsis
  • People with a serious liver problem called decompensated cirrhosis don’t usually do well and have a high chance of dying from it.
  • There is growing interest in using a type of surgery called metabolic bariatric surgery (MBS) to help people improve their liver health, especially those with a related condition called MASLD.
  • This article talks about how MBS could help these patients, the challenges it has, and the need for more research to understand it better.
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  • The study investigates the risk factors and outcomes related to open conversion during minimally invasive liver resections (MILR), especially in minor hepatectomies, highlighting its association with inferior results.
  • Analysis was conducted on data from over 10,500 patients who underwent laparoscopic or robotic liver resections from 2004 to 2020, identifying key independent predictors for open conversion.
  • Results show that patients who required open conversion experienced longer recovery times, increased blood loss, higher complications, and elevated 90-day mortality rates compared to those who had successful minimally invasive surgeries.
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Background: With the implementation of the 11th edition of the International Classification of Diseases (ICD-11) and the publication of the metabolic dysfunction-associated fatty liver disease (MAFLD) nomenclature in 2020, it is important to establish consensus for the coding of MAFLD in ICD-11. This will inform subsequent revisions of ICD-11.

Methods: Using the Qualtrics XM and WJX platforms, questionnaires were sent online to MAFLD-ICD-11 coding collaborators, authors of papers, and relevant association members.

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Article Synopsis
  • In a study by Wu, patients with a type of liver cancer that couldn't be removed were treated with a method called TACE to make their tumors easier to remove later.
  • They created a prediction tool (called a nomogram) that helps figure out how long these patients might live after treatment.
  • However, it's hard to say if the results apply to everyone because they only looked at patients who had surgery after TACE and not those who couldn't have TACE at all.
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Background & Aims: Hepatocellular carcinoma (HCC) is a heterogeneous cancer with varying levels of liver tumor initiating or cancer stem cells in the tumors. We aimed to investigate the expression of different liver cancer stem cell (LCSC) markers in human HCCs and identify their regulatory mechanisms in stemness-related cells.

Methods: We used an unbiased, single-marker sorting approach by flow cytometry, fluorescence-activated cell sorting, and transcriptomic analyses on HCC patients' resected specimens.

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Background: Intraoperative indocyanine green (ICG) fluorescence imaging has been shown to be a new and innovative way to illustrate the optimal resection margin in hepatectomy for hepatocellular carcinoma. This study investigated its accuracy in resection margin determination by looking into the correlation of ICG intensity gradients with pathological examination results of resected specimens.

Methods: This was a prospective, single-center, non-randomized controlled study.

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Article Synopsis
  • Minimally invasive liver surgery has become more common over the last 30 years, especially for treating colorectal liver metastases, but the effects of neoadjuvant chemotherapy on surgical outcomes are not well understood.
  • A study analyzed a large database of nearly 5,000 patients who underwent minimally invasive liver surgeries to compare outcomes between those who received neoadjuvant chemotherapy and those who did not.
  • The results showed that neoadjuvant chemotherapy did not significantly affect the short-term surgical outcomes in patients undergoing these liver procedures.
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Objective: This study is to examine the impact of perioperative (intraoperative/postoperative) blood transfusion on the outcomes of curative hepatectomy for hepatocellular carcinoma. Hepatectomy is a well-established curative treatment for hepatocellular carcinoma, and blood transfusion cannot always be avoided in treating the disease.

Methods: A retrospective study of patients having curative hepatectomy for hepatocellular carcinoma from January 2010 to December 2019 at a single center was conducted.

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Article Synopsis
  • Researchers studied the effects of a drug called nivolumab on patients with a type of liver cancer called hepatocellular carcinoma (HCC) before surgery.
  • They found that this treatment helped many patients, with some showing significant tumor damage after using the drug.
  • Scientists also discovered a way to predict how well patients would respond to the treatment using tests on their blood.
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The tumor microenvironment of cancers has emerged as a crucial component in regulating cancer stemness and plays a pivotal role in cell-cell communication. However, the specific mechanisms underlying these phenomena remain poorly understood. We performed the single-cell RNA sequencing (scRNA-seq) on nine HBV-associated hepatocellular carcinoma (HCC) patients.

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