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Open research questions in Cholangiocarcinoma and Gallbladder Cancer Studies

215 gap statements mined from Cholangiocarcinoma and Gallbladder Cancer Studies papers in our 4.5M-paper local library, which holds 942 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • Early diagnosis of HCS remains a major challenge in clinical practice. There is a lack of specific clinical manifestations, imaging features, and serological markers for HCS.

    Hepatic carcinosarcoma with predominant sarcomatous component mimicking intrahepatic cholangiocarcinoma: a case report and literature review · 2026 · DOI

  • The lack of standardized treatment protocols for cHCC-CCA is a significant limitation.

    From organelles to therapy: rethinking combined hepatocellular-cholangiocarcinoma · 2026 · DOI

  • The molecular mechanisms underlying cHCC-CCA are not well understood. The lack of standardized treatment protocols for cHCC-CCA is a significant limitation.

    From organelles to therapy: rethinking combined hepatocellular-cholangiocarcinoma · 2026 · DOI

  • Intrahepatic tumor burden and liver failure are major challenges in the treatment of iCCA. The postoperative role of adjuvant RT remains controversial in iCCA. There is a lack of understanding of the role of EBRT in downstaging strategies for iCCA patients.

    External Beam Radiation Therapy for Intrahepatic Cholangiocarcinoma · 2026 · DOI

  • The available data remain largely retrospective. The postoperative role of adjuvant RT remains controversial in iCCA with conflicting retrospective evidence and guideline caution emphasizing systemic therapy as preferred.

    External Beam Radiation Therapy for Intrahepatic Cholangiocarcinoma · 2026 · DOI

  • There is a lack of effective treatments for cholangiocarcinoma. Current evidence remains limited to early-phase trials. Larger studies are needed to establish clinical efficacy and optimal patient selection criteria.

    Harnessing cellular immunotherapy for cholangiocarcinoma: an integrated roadmap for overcoming resistance · 2026 · DOI

  • Although prospective validation is warranted, these results position NAT-guided surgical selection as a promising strategy to redefine treatment paradigms for high-risk iCCA.

    Neoadjuvant Therapy as a Selection Strategy for Curative Resection in High-Risk Intrahepatic Cholangiocarcinoma · 2026 · DOI

  • The lack of understanding of the geographic and genetic diversity in GBC mutation profiles hinders the development of targeted therapies. The study of GBC is challenging due to its aggressive nature and limited treatment options.

    Geographic and genetic diversity in gallbladder cancer mutation profiles: insights from a worldwide exome analysis · 2026 · DOI

  • There is a lack of understanding of the geographic and genetic diversity in GBC mutation profiles. Prior studies have not fully investigated the relationship between genetic ancestry and GBC mutation profiles.

    Geographic and genetic diversity in gallbladder cancer mutation profiles: insights from a worldwide exome analysis · 2026 · DOI

  • The pathogenesis of GBC remains inadequately elucidated. There is a paucity of evidence connecting GBC to pseudopyloric metaplasia.

    CLDN18 identifies high-risk precursor lesions in gallbladder carcinogenesis: A study of the TFF2⁺ pseudopyloric metaplasia to intestinal metaplasia axis · 2026 · DOI

  • There is a lack of awareness among clinicians about the association between porcelain gallbladder and gallbladder cancer. There is a need for early surgical intervention in the management of porcelain gallbladder.

    Clinical management of porcelain gallbladder: A case report · 2026 · DOI

  • As mentioned previously, the ancillary treatment for stage IIIB carcinoma remains poorly defined, resulting in heterogenous approaches to chemotherapy, as seen in this study. Given the specificity of clinically stage IIIB gallbladder carcinoma, clinical trial data is lacking and often require extrapolation.

    Perioperative chemotherapy for clinical stage IIIB gallbladder cancer: a review of the National Cancer Database · 2026 · DOI

  • There is a lack of reliable markers for prognostic assessment or tailored postoperative therapy for cHCC-CCA. The etiology and clinicopathological features of cHCC-CCA remain unknown.

    Human epidermal growth factor receptor 2 in combined hepatocellular-cholangiocarcinoma: Prognostic and predictive guide for adjuvant chemotherapy · 2026 · DOI

  • The clinical importance of SMYD2 in primary ICC could not be demonstrated. The study had a small number of ICC cases. There is still insufficient demonstration of how the phosphorylation of p65S536 regulates CCR7 expression. Further rescue experiments are required to determine the direct causal necessity of CCR7.

    SMYD2 regulates lymph node metastasis derived from intrahepatic cholangiocellular carcinoma through CCR7-dependent chemotaxis · 2026 · DOI

  • Cholangiocarcinoma typically affects patients in the sixth decade of life, and cases occurring under the age of 50 remain understudied (10). Primary melanoma of the CBD is exceedingly rare, and its pathological diagnosis remains controversial due to the absence of specific immunohistochemical features (13).

    Primary malignant melanoma of the common bile duct: An unexpected finding at pancreaticoduodenectomy: A case report · 2026 · DOI

  • There is a lack of understanding of the full toxicity spectrum of FGFR2 inhibitors. Calciphylaxis is a rare but severe adverse event associated with FGFR inhibitors, and early recognition and multidisciplinary management are crucial.

    Calciphylaxis as a Rare Complication Associated with Pemigatinib Treatment—A Case Report · 2026 · DOI

  • Early detection of GBC is challenging due to non-specific symptoms. Treatment of GBC is challenging due to rapid local invasion and poor survival outcomes. Public health initiatives are needed to reduce the risk factors for GBC.

    Demographic, Clinical, Radiological, and Cytopathological Profiles of Patients With Gallbladder Carcinoma in Tripura: A Hospital-Based Cross-Sectional Study · 2026 · DOI

  • The study is hospital-based and may not be representative of the general population. Pathological staging was unavailable in many patients due to lack of definitive surgical resection. The study did not include a control group.

    Demographic, Clinical, Radiological, and Cytopathological Profiles of Patients With Gallbladder Carcinoma in Tripura: A Hospital-Based Cross-Sectional Study · 2026 · DOI

  • There is a need to improve the postoperative treatment for ICC. The current treatment options for ICC have high recurrence rates and poor overall survival.

    Chemotherapy combined with immunotherapy vs. chemotherapy: comparison of safety and efficacy in adjuvant therapy for intrahepatic cholangiocarcinoma · 2026 · DOI

  • Few studies have explored the efficacy of adjuvant treatment exclusively for patients with GBC, aside from those using statistical databases, such as Surveillance, Epidemiology, and End Results, which have a higher probability of coding errors and lack important data.

    Real-World Application of a Machine Learning-Based Early Recurrence Model for Guiding Adjuvant Chemotherapy Use in Patients with Gallbladder Cancer · 2026 · DOI

  • Lack of understanding of the molecular pathogenesis of Gallbladder cancer.

    Transcriptomic landscape of Gallbladder cancer reveals altered pathways related to cell cycle and Aurora kinase · 2026 · DOI

  • The study did not investigate the molecular mechanisms underlying CLDN18 expression. The sample size was limited to 37 GBC cases.

    CLDN18 identifies high-risk precursor lesions in gallbladder carcinogenesis: A study of the TFF2⁺ pseudopyloric metaplasia to intestinal metaplasia axis · 2026 · DOI

  • Hepatectomy with portal vein resection and reconstruction is still considered a limitation in laparoscopic surgery - Intraoperative confirmation of portal vein invasion still remains…

    ASO Author Reflections: Digital Intelligent Technologies Assisted in Surgical Decision-Making for Minimally Invasive Treatment of Perihilar Cholangiocarcinoma · 2026 · DOI

  • The limitations of traditional 2D images in preoperative evaluation - The need for improved preoperative planning and reduced risk of postoperative…

    ASO Author Reflections: Digital Intelligent Technologies Assisted in Surgical Decision-Making for Minimally Invasive Treatment of Perihilar Cholangiocarcinoma · 2026 · DOI

  • Establishing a spontaneous LNM model of ICC to evaluate the chemokine-mediated chemotaxis in vivo. Elucidating the precise downstream mechanisms of the CCR7 pathway in LNM. Investigating the role of SMYD2 in primary ICC.

    SMYD2 regulates lymph node metastasis derived from intrahepatic cholangiocellular carcinoma through CCR7-dependent chemotaxis · 2026 · DOI

Most-cited papers in Cholangiocarcinoma and Gallbladder Cancer Studies

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Open questions raised by papers listed on this page include: (1) There is a lack of specific clinical manifestations, imaging features, and serological markers for HCS (“Hepatic carcinosarcoma with predominant sarcomatous component mimicking…”, 2026); (2) The lack of standardized treatment protocols for cHCC-CCA is a significant limitation (“From organelles to therapy: rethinking combined hepatocellular-cholangiocarcinom…”, 2026); (3) The postoperative role of adjuvant RT remains controversial in iCCA (“External Beam Radiation Therapy for Intrahepatic Cholangiocarcinoma”, 2026); (4) There is a lack of effective treatments for cholangiocarcinoma (“Harnessing cellular immunotherapy for cholangiocarcinoma: an integrated roadmap…”, 2026); (5) Although prospective validation is warranted, these results position NAT-guided surgical selection as a promising strategy to redefine treatment paradigms for high-risk iCCA (“Neoadjuvant Therapy as a Selection Strategy for Curative Resection in High-Risk…”, 2026). 215 gap statements have been mined from Cholangiocarcinoma and Gallbladder Cancer Studies papers in our 4.5M-paper local library, which holds 942 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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