Introduction: Multidisciplinary tumor boards (MTBs) are the standard for oncologic decision-making but require substantial time and personnel resources. Large language models (LLMs) may support MTBs by generating structured, guideline-based recommendations. We evaluated concordance between MTB decisions and LLM recommendations in newly diagnosed cholangiocellular adenocarcinoma (CCA) and hepatocellular carcinoma (HCC). Method: In this retrospective single-center study, MTB protocols from 2022–2023 were screened. After exclusions, 50 CCA and 50 HCC cases were analyzed. Institutional MTB recommendations were compared with outputs from ChatGPT and Claude using identical structured clinical summaries available at the time of MTB presentation. Agreement was assessed using Cohen’s kappa, and correlation using Spearman’s rank coefficient. Results: For CCA, exact concordance between MTB and ChatGPT was 80%, with substantial agreement (k = 0.688) and strong correlation (r = 0.725; both p < 0.001). Concordance with Claude was at 56%. For HCC, concordance between MTB and ChatGPT was 66%, with substantial agreement (k = 0.604) and moderate correlation (r = 0.484; both p < 0.001). Concordance with Claude was only 38%, with fair agreement (k = 0.314, p < 0.001) and weak correlation (r = 0.086, p = 0.551). Conclusions: LLM-derived recommendations varied markedly by model. ChatGPT demonstrated substantial concordance, whereas Claude showed limited agreement. MTBs appeared more individualized, while LLM outputs were more guideline-oriented. These findings highlight the potential role of LLMs as supportive tools for structured clinical reasoning and guideline adherence. Prospective multicenter studies should evaluate real-time LLM integration into MTB workflows, efficiency, decision quality, and patient outcomes safely.

Background: The indication and timing of native nephrectomy in autosomal dominant polycystic kidney disease (ADPKD) kidney transplant recipients are a matter of ongoing debate. Data on bilateral nephrectomy in such patients is scarce. This study therefore compares the clinical outcome of ADPKD patients undergoing bilateral nephrectomy before or after transplantation. Methods: This retrospective single-center study analyzed all ADPKD patients undergoing kidney transplantation at our department between January 2007 and December 2017. Surgical complications, according to the Clavien-Dindo classification, and long-term graft outcomes were compared between ADPKD kidney transplant recipients undergoing bilateral nephrectomy pre- vs posttransplant. Results: A total of 273 kidney transplants were performed in ADPKD patients. Of these, 107 (39.2%) patients required native nephrectomy. Unilateral and bilateral nephrectomy was performed in 36 (33.6%) and 71 (66.4%) patients, respectively. We compared seven patients with bilateral nephrectomy before vs 20 patients after kidney transplantation. Pain and cyst infections were the most common indications in both groups. Operation time (P = .001) and perioperative transfusion requirements (P < .001) were significantly increased in the pretransplant nephrectomy group. The total number of Clavien-Dindo complications grade III (P = .054) and IV (P = .015) was greater in patients with nephrectomy preceding transplantation. However, 1-, 3- and 5-year graft and patient survival (P = .347 and P = .596) were not different between the pre- and posttransplant nephrectomy approaches. Conclusions: A posttransplant nephrectomy appears to be a relatively safe procedure. However, bilateral nephrectomies are highly invasive and should be avoided unless absolutely necessary. The timing and surgical outcome after nephrectomy do not significantly affect long-term graft or patient survival.

Background: Laparoscopic techniques have been successfully implemented for living kidney donation. However, open surgical procedures also yield excellent perioperative outcomes. Endoscopic donor nephrectomy is associated with minimal trauma but is difficult for right-sided nephrectomies. Here, an open nephrectomy approach using a singular pararectal extraperitoneal mini-incision (SPEM) and the perioperative results are presented to elucidate whether open surgery is still justified in the modern era of endoscopic surgery. Methods: In this single-center retrospective study, all living kidney donations performed at the Department of General, Visceral and Transplant Surgery of the Hannover Medical School from January 2007 to December 2017 were assessed. Donor characteristics, operation time, transfusion requirements, perioperative complications, and graft outcomes were analyzed. Results: Out of a total of 1681 kidney transplantations, 425 living kidney donations (25.2%) were performed. Donors were primarily female (273; 64.2%) and had a median age and body-mass index of 53 (24–76) years and 25.3 (16.8–36.4) kg/m², respectively. The left kidney was harvested in 50.1% (211) of cases. Median operative time was 95 (48–212) min. Intraoperative transfusion was not required in any of the donors. Intraoperative complications were observed in 2.6% of cases (11), with injury of the donor kidney (5; 1.2%) and acute hemorrhage (3; 0.7%) being the most common complications. Postoperative complications were hematomas (32; 7.7%), seromas (28; 6.7%), and wound infections (7; 1.7%). Except for a single surgical revision owing to colon perforation (1; 0.002%), no other major complications (Clavien–Dindo ≥ IIIa) were observed in any of the donors. The donor’s and recipient’s median estimated glomerular filtration rate at discharge was 55 (29–114) and 51 (14–129) ml/min/1.73 m², respectively. Initial nonfunction occurred in seven cases (1.6%). Conclusions: Unlike the endoscopic technique, SPEM is equally suitable for right- and left-sided nephrectomy. SPEM nephrectomy is safe and results in minimal trauma. Despite performing SPEM nephrectomy in the era of endoscopic surgery, this technique provides excellent results with regard to donor and graft outcomes.

Background: Cholangiocarcinoma (CCA) of the liver is a highly aggressive cancer that arises from malignant cells in the bile ducts. Radical surgery remains the only curative option, but major liver resection carries high perioperative risks. This study investigates the predictive value of preoperative bone mineral density (BMD), measured via CT, for perioperative complications, mortality, and long-term outcomes. Methods: The analysis included 202 patients who underwent curative-intent surgery for intrahepatic cholangiocarcinoma (iCCA; n = 97) or perihilar cholangiocarcinoma (pCCA; n = 105) between 2010 and 2019. Preoperative bone mineral density (BMD) was assessed using computed tomography segmentation at the level of the 12th thoracic vertebra. Osteopenia was defined according to established cutoffs. Results: Osteopenia was highly prevalent in both iCCA (53/97, 54%) and pCCA (54/105, 51%) subcohorts. Patients suffering from osteopenia were significantly older than those without (71.1 [62–76.6] years vs. 61.3 [52.9–69.2] years; p < 0.001). Alteration in BMD did not demonstrate a significant prognostic effect in terms of perioperative morbidity (Mann–Whitney U; comprehensive complication index—CCI: 34 [9–56] vs. 40 [21–72] p = 0.185; iCCA: p = 0.803; pCCA: p = 0.165). The median overall survival in our cohort was 19 [14–25] months. Patients with osteopenia did not exhibit a significantly different overall survival compared to those with normal bone mineral density (log-rank p = 0.234). Conclusions: In contrast to our previous observations in other oncological patient cohorts, osteopenia alone had no significant negative impact on clinical outcomes in our large European cohort of patients undergoing curative-intent surgery for CCA. To validate these findings, further prospective studies are warranted.

Background.: Several viability tests, including lactate clearance and bile production, are used to evaluate livers during normothermic machine perfusion (NMP). However, specific cutoff values and therapeutic consequences vary significantly. The noninvasive ¹³ C-methacetin liver function breath test (LiMAx) was developed to measure the actual liver function capacity. This might also provide useful insights into graft function during NMP. Methods.: Therefore, we used an established porcine model of prolonged static cold storage (pSCS) and subsequent NMP for additional functional monitoring with the LiMAx test. Livers obtained from 9 pigs underwent NMP for 6 h directly after procurement (control group) or after 20 h of SCS (pSCS). After 6 h of NMP, the LiMAx test was performed using a liver weight-adjusted dose of ¹³ C-methacetin. Results.: After pSCS, transaminase and cholestasis parameters were found to be elevated in the perfusate and reduced lactate clearance was measured. Bile analyses further revealed reduced bile production and elevated glucose concentrations. In line with these results, the LiMAx test also showed significantly reduced values compared with the control group, with a mean value of 57.0 µg/kg/h compared with 182.0 µg/kg/h in the control group ( P = 0.032). Conclusions.: Therefore, we suggest the LiMAx test as a novel diagnostic tool for evaluating donor organs during NMP.

Background: Hepatocellular carcinoma (HCC) is a leading indication for liver transplantation (LT), representing a curative treatment option for selected patients. A remaining clinical challenge is the recurrence of HCC after transplantation, impacting long-term graft and patient survival. The impact of different bridging therapies (BTs) such as transarterial chemoembolization (TACE), local ablation or liver resection on recurrence rates remains unclear. We assessed post-transplant HCC recurrence and survival focusing on the role of pre-transplant bridging therapies. Methods: Adult recipients undergoing LT for HCC at Hannover Medical School from January 2007 to September 2022 were retrospectively analyzed (n = 185). Recurrence was defined as confirmed intra or extrahepatic HCC after LT. Overall survival (OS) and recurrence-free survival (RFS) were analyzed using Kaplan–Meier estimation and log-rank testing; multivariable Cox proportional hazards regression was used to identify independent factors influencing OS. Results: Pre-transplant BT was administered in 85.4% of patients, consisting of only TACE, (n = 20; 10.8%), local ablation, (n = 32; 17.3%), liver resection (n = 27; 14.6%) or a multimodal approach (n = 50; 27%). Post-transplant HCC recurrence rate was 9.2% with a median time to recurrence of 845 days (range 126–3978 days). Patients with post-transplant HCC recurrence had a significantly higher prevalence of viral hepatitis (70.6% vs. 57.1%; p = 0.01), higher pre-transplant AFP peak levels (37.5 vs. 10 ng/mL; p = 0.03), larger tumor sizes (median 3.95 cm vs. 2.6 cm; p = 0.03) and more poorly differentiated tumors (G3; 25.0% vs. 5.3%, p = 0.04). Kaplan–Meier analysis showed significant overall differences in OS and RFS among bridging therapy groups (p = 0.03). In the subgroup of early HCC < 3 cm, local ablation was associated with significantly improved OS compared to TACE (p = 0.035). Last measured pre-transplant AFP < 15 ng/mL was a significant predictor of both improved OS (p = 0.006) and RFS (p = 0.008), whereas peak AFP did not reach significance after correction. Multivariable Cox regression revealed HCC recurrence, high recipient BMI and low LabMELD as independently associated with reduced OS after LT. Median OS after HCC recurrence was 13 months. Conclusions: Our monocentric retrospective data indicate that post-transplant HCC recurrence is uncommon but remains a challenge regarding life expectancy and is influenced by pre-transplant bridging therapy. In the subgroup of early HCC < 3 cm, local ablation was associated with significantly improved OS compared to TACE. Last measured pre-transplant AFP < 15 ng/mL was associated with both improved OS and RFS, suggesting that treatment response may also represent a prognostically relevant factor. Further prospective validation of contemporary locoregional and systemic bridging approaches, especially in the context of tumor biology and treatment response, is warranted.