Resection For Gallbladder Cancer Research Articles

Risk factors and survival prediction model establishment for prognosis in patients with radical resection of gallbladder cancer

Risk factors and survival prediction model establishment for prognosis in patients with radical resection of gallbladder cancer

A Single-Center Analysis of Patient Characteristics and Overall Survival in Patients with Resectable Gallbladder Cancer.

Gallbladder cancer (GBC) is a rare and aggressive hepatobiliary malignancy with poor prognosis. The symptoms of GBC are insidious and non-specific in its early stages, and most patients are diagnosed at advanced or late stages. Surgical resection is the only potentially curative treatment for GBC for select patients. There is a lack of robust data for patients with GBC, leading to heterogenous practices in management strategies and outcomes. In this study, we aimed to identify patient characteristics and cumulative overall survival (OS) in patients with GBC who underwent surgical resection with curative intent. All adult patients (age ≥18 years) with localized or locoregionally advanced GBC who underwent definitive surgery with curative intent at our tertiary institution between 1/2013 and 12/2023 were retrospectively identified. Clinical, laboratory, radiology, histopathology, treatment, and survival data were collected from electronic medical records. Postoperative data included the use of adjuvant chemotherapy or radiotherapy, and patient survival mortality at a cut-off date of 1 February, 2024, calculated from the date of curative surgery. Continuous variables are reported as median and quartile 1 (Q1) and quartile 3 (Q3), while categorical variables are reported as counts and percentages. A total of 94 patients with GBC were included in the study. Median age was 71 (62-77) years and 58 (61.7%) patients were female. Median tumor size was 3.3 (1.9-5.0) cm. Perineural invasion was seen in 48.9% and vascular invasion in 38.3% of patients. A positive surgical margin was present in 50% of the patients, and incidental GBC (IGBC) was seen in 48.9% of patients. Tumor grade was well differentiated in 7.6%, moderately differentiated in 53.3%, and poorly differentiated in 39.1% of the patients. Patients with stage T1a (2.1%) and T1b (11.7%) tumors comprised the minority, and the majority of the tumors were stage T2 (55.3%), followed by T3 (31.9%). A total of 60.6% of patients with GBC underwent adjuvant chemotherapy, and 17% underwent adjuvant radiotherapy after surgical resection. Overall, 62 (66.0%) patients died, and the median OS was 1.88 years. The 1-year OS was 68.7%, 3-year OS was 37.4%, and 5-year OS was 32.2%. A higher absolute median OS was seen in patients who had adjuvant chemotherapy (2.1 years) compared to no chemotherapy (1.9 years); however, this finding was not statistically significant (p = 0.36). The median survival was 2.3 years in IGBC compared to 1.6 years in non-IGBC (p = 0.63). GBC is an aggressive hepatobiliary malignancy that is often diagnosed at advanced stages. Our study showed high rates of local and systemic involvement and high mortality, and the need for prospective and randomized studies on adjuvant therapies to assess their survival benefit. Real-world patient data remain important to identify patients at risk of worse outcomes and to stratify risks prior to surgery.

The impact of lymph node ratio on survival in gallbladder cancer: a national cancer database analysis

BackgroundThe study aimed to investigate the impact of lymph node ratio (LNR) on survival in patients with resectable gallbladder adenocarcinoma. MethodsWe retrospectively analyzed the National Cancer Database from 2004 to 2020. We included patients with gallbladder adenocarcinoma who had undergone resection of the primary site as well as adequate lymphadenectomy. Exclusions comprised patients with distant metastasis and missing key data. LNR was calculated as a proportion of positive lymph nodes (LNs) to examined LNs. ResultsPatients were stratified into LNR groups: LNR0 - 343 patients (55%); 168 (26.9%) patients with LNR < 30%; and 113 (18.1%) with LNR ≥ 30%. The mean age was 67.3 ± 10.7 years, with 71.6% being female and 75.8% identifying as white. The mean overall survival (OS) was 52.8 months for the LNR0 group, 36.3 months for LNR < 30%, and 27 months for LNR ≥ 30% (p < 0.001). The difference in survival was significant when adjusted for adjuvant chemotherapy status and surgical margins using Cox regression – HR 3.2 (2.4–4.5 95% CI) for LNR < 30% and HR 4.9 (3.5–6.8 95% CI) for LNR ≥ 30%. ConclusionThe study suggests that LNR is a valuable prognostic factor for resectable gallbladder cancer patients and could potentially guide treatment decisions.

Outcomes of Resectable Gallbladder Cancer: A Retrospective Analysis From a Tertiary Care Centre in India.

Background Gallbladder carcinoma (GBC) has deleterious outcomes, but due to its reduced incidence in Western countries, there is a paucity of data on this disease. Here we report the outcomes of a retrospective analysis of resectable gallbladder cancer from a tertiary cancer centre in eastern India. The primary objective of this study is to evaluate the overall survival (OS) and relapse-free survival (RFS) rates among patients with resectable GBC. Methods A retrospective analysis was carried out on patients who underwent radical surgery between 2007 and 2022 and received various neoadjuvant and adjuvant chemotherapy methods. Patients who had adjuvant chemoradiotherapy concurrently or who did not receive adjuvant therapy were excluded. All the baseline clinicopathological characteristics were retrieved from electronic medical records. The survival data were collected from records of follow-up visits as well as telephonic calls to the patients who were lost to follow-up. Simple proportions were used for baseline characteristics, and the Kaplan-Meier method was used for survival analysis. Results A total of 161 patients were identified, and data were captured from electronic medical records. The included patients' ages ranged between 26 and 80 years, with a median age of 56 years. Among the participants, 103 were female (64%) and 58 (36%) were male. Among the 161 patients, the median number of lymph nodes harvested was nine (ranging from one to 43), and only three patients were margin-positive. The tumour, nodes, and metastasis (TNM) distributions were as follows: pT2 in 111 patients (70.25%), pT3 in 44 patients (27.85%), and pT4 in three patients (1.90%). The nodal statuses were pN0 in 91 patients (61.9%), pN1 in 51 patients (34.69%), and pN2 in five patients (3.4%). The majority (64%) received single-agent capecitabine, 27% received gemcitabine-based platinum doublet therapy, and 4.3% received neoadjuvant therapy. Of the full sample, 2.4% received concurrent adjuvant chemo plus radiation therapy, and three patients did not receive any adjuvant therapy. Additionally, among the 161 patients, 34.16% had a relapse, with 47% being local and 52% being distant relapses. The median follow-up was 49 months (interquartile range (IQR) 23-71 months). The 24-month RFS rate was 67.1% (SD+/- 4.3%), and the 24-month OS rate was 78.1% (SD+/- 4.1%). Conclusion Our data, which is from one of the largest samples from India, show that resectable gallbladder cancer has very good outcomes after radical surgery and adjuvant chemotherapy. There was a higher proportion of T2 and node-negative disease, which could have led to better survival compared to published literature.

IRON: A retrospective international multicenter study on robotic versus laparoscopic versus open approach in gallbladder cancer

ObjectiveFor patients with T1b gallbladder cancer or greater, an adequate lymphadenectomy should include at least 6 nodes. Studies comparing short- and long-term outcomes of the open approach with those of laparoscopy and robotic approaches are limited, with small sample sizes, and there are none comparing laparoscopic and robotic approaches. This study compared patients who underwent robotic, laparoscopic, and open resection of gallbladder cancer, evaluating short- and long-term outcomes. MethodsWe conducted a multicenter retrospective study of patients with T1b gallbladder cancer or greater (excluding combined organ resection and T4) who underwent open, laparoscopic, and robotic liver resection and lymphadenectomy between January 2012 and December 2022. The 3 groups were matched in terms of patient baseline and disease characteristics based on propensity score matching, comparing robotic with open and robotic with laparoscopic groups. ResultsWe enrolled 575 patients from 37 institutions. After propensity score matching, the median number of harvested nodes was higher in the robotic group than in the open (7 vs 5; P = .0150) and laparoscopic groups (7 vs 4; P < .001). The Pringle maneuver time was shorter with robotic resection than with laparoscopy (38 vs 59 minutes; P = .0034), and the robotic group also had a lower conversion rate (3% vs 14%, respectively; P = .005) and less estimated blood loss than open and laparoscopic resections. The perioperative morbidity and mortality rates did not differ. The robotic and laparoscopic approaches were associated with faster functional recovery than the open group. In the multivariate analysis, the factors related to the retrieval of at least 6 nodes were the robotic approach over open (odds ratio, 5.1529) and over laparoscopy (odds ratio, 6.7289) and the center experience (≥20 minimally invasive liver resections/year) (odds ratio, 4.962). After a mean follow-up of 42.6 months, overall survival and disease-free survival were not different between groups. ConclusionCompared with open and laparoscopic surgeries, the robotic approach for gallbladder cancer performed in a center with appropriate experience in minimally invasive surgery can provide adequate node retrieval.

Preoperative MRI-based nomogram to predict survival after curative resection in patients with gallbladder cancer: a retrospective multicenter analysis.

To use preoperative MRI data to construct a nomogram to predict survival in patients who have undergone R0 resection for gallbladder cancer. The present retrospective study included 143 patients (M:F, 76:67; 67.15years) with gallbladder cancer who underwent preoperative MRI and subsequent R0 resection between 2013 and 2021 at two tertiary institutions. Clinical and radiological features were analyzed using univariate and multivariate Cox regression analysis to identify independent prognostic factors. Based on the multivariate analysis, we developed an MRI-based nomogram for determining prognoses after curative resections of gallbladder cancer. We also obtained calibration curves for 1-,3-, and 5-year survival probabilities. The multivariate model consisted of the following independent predictors of poor overall survival (OS), which were used for constructing the nomogram: age (years; hazard ratio [HR] = 1.04; 95% confidence interval [CI], 1.04-1.07; p = 0.033); tumor size (cm; HR = 1.40; 95% CI, 1.09-1.79; p = 0.008); bile duct invasion (HR = 3.54; 95% CI, 1.66-7.58; p = 0.001); regional lymph node metastasis (HR = 2.47; 95% CI, 1.10-5.57; p = 0.029); and hepatic artery invasion (HR = 2.66; 95% CI, 1.04-6.83; p = 0.042). The nomogram showed good probabilities of survival on the calibration curves, and the concordance index of the model for predicting overall survival (OS) was 0.779. Preoperative MRI findings could be used to determine the prognosis of gallbladder cancer, and the MRI-based nomogram accurately predicted OS in patients with gallbladder cancer who underwent curative resection.

Overall survival outcomes of phase II GECCOR-GB trial, a multicentre trial of adjuvant adjuvant gemcitabine plus cisplatin (GC) and capecitabine with concurrent capecitabine radiotherapy (Cape-RT) for operated gallbladder cancer (GBC).

4124 Background: The optimal adjuvant treatment for gallbladder cancer (GBC) after surgery remains unclear. We previously reported 1 year of disease-free survival (DFS) of adjuvant gemcitabine plus cisplatin (GC) or capecitabine with concurrent capecitabine radiotherapy (Cape-RT). Here, we present the secondary endpoint of the 3-year outcomes of the GECCOR-GB study. Methods: We conducted a multicenter, open-label, non-comparative randomized phase II trial of adjuvant GC or Cape-RT in patients with resected GBC. Patients were randomized 1:1 to receive either GC (gemcitabine 1000 mg/m2 and cisplatin 25 mg/m2 on days 1 and 8 of a 21-day cycle for 6 cycles) or Cape-RT arm {Capecitabine 1000 mg/m2 BD on days 1–14, q 3 weeks for 2-4 cycles followed by chemoradiation (RT: 45 Gy over 25 fractions concurrent with capecitabine: 825 mg/m2 BD) followed by 2-4 cycles of capecitabine for a total of 6 cycles}. The primary endpoint was DFS, and the secondary endpoints were overall survival (OS), safety, and treatment completion rates. Results: We enrolled 90 patients at 3 centers in India between May 2019 and February 2022 and randomly assigned 45 patients to each arm. In the GC arm, the median age of patients was 56 (33–72) years, and 23 (51%) patients were in stage II. While in the cape-RT arm, the median age was 55 (26–69) years, with 27 (60%) patients in stage II. The 3-year DFS was 54.3% in the GC arm and 70.7% in the Cape-RT arm, respectively. The 3-year OS was 75% in the GC arm and 73% in the Cape-RT arm, respectively. The 3-year OS in stage II patients (n = 23) in the GC arm was 91.3%, while in the cape-RT arm (n = 27), it was 91.9%. Median OS in stage III patients (n = 22) was 39.1 (95% CI, 33.4–44.6) months in the GC arm, while in the cape-RT (n = 18), it was 23.2 (95% CI, 7.0–39.4) months. Conclusions: Adjuvant GC arm patients, especially those in stage III, had encouraging OS at 3 years, while both GC and adjuvant Cape-RT arms had excellent 3-year OS, reaching more than 90% in patients with stage II-operated GBC. Further studies are needed to compare and validate these findings for GBC patients. GECCOR-GBwas led by Tata Memorial Hospital (TMC), Mumbai. Clinical trial information: CTRI/2019/05/019323.

Progress and controversy in minimally invasive approach to radical cholecystectomy for gallbladder cancer

Surgical treatment is one of the most important forms of treatment in patients with gallbladder cancer. With the development of minimally invasive technology, the feasibility, safety and efficacy of minimally invasive approaches such as laparoscopic or robotic-assisted radical cholecystectomy for gallbladder cancer have received continuous attention.For patients with an early T-stage (Tis or T1a), laparoscopic simple cholecystectomy is safe and economical, with a good prognosis for postoperative patients, and it has been widely accepted and performed. Radical resection of advanced gallbladder cancer requires resection of the gallbladder, its liver bed, and other neighboring invaded organs, as well as clearance of regional lymph nodes, which requires experienced gallbladder cancer treatment teams to strictly grasp the indications, select appropriate patients, and formulate a good surgical strategy to ensure the therapeutic effect. Meanwhile, robot-assisted radical resection for gallbladder cancer has been performed in a few centers and shows good clinical potential, but more high-quality studies are needed to further evaluate its value in gallbladder cancer treatment.

The prognostic value of combined preoperative PLR and CA19-9 in patients with resectable gallbladder cancer.

The platelet to lymphocyte ratio (PLR) is the marker of host inflammation and it is a potential significant prognostic indicator in various different tumors. The serum carbohydrate antigen 19-9 (CA19-9) is a tumor-associated antigen and it is associated with poor prognosis of gallbladder cancer (GBC). We aimed to analyze the prognostic value of the combination of preoperative PLR and CA19-9 in patients with GBC. A total of 287 GBC patients who underwent curative surgery in our institution was included. To analyze the relationship between PLR and CA19-9 and clinicopathological features. A receiver operating characteristic (ROC) curve was used to identify the optimal cutoff value for PLR and CA19-9. The Kaplan-Meier method was used to estimate the overall survival (OS). Meanwhile, the univariate and multivariate Cox regression models were used to assess the risk factors for OS. The cutoff values of 146.82 and 36.32U/ml defined as high PLR and high CA19-9, respectively. Furthermore, survival analysis showed that patients with PLR > 146.82 and CA19-9 > 36.32 U/ml had a worse prognosis than patients with PLR ≤ 146.82 and CA19-9 ≤ 36.32 U/ml, respectively. The multivariate analysis demonstrated that PLR (hazard ratio (HR) = 1.863, 95% CI: 1.366-2.542, P < 0.001) and CA19-9 (HR = 1.412, 95% CI: 1.021-1.952, P = 0.037) were independent prognostic factors in the GBC patients. When we combined these two parameters, the area under the ROC curve increased from 0.624 (PLR) and 0.661 (CA19-9) to 0.711. In addition, the 1-, 3-, and 5-year OS of group A (patients with PLR ≤ 146.82 and CA19-9 ≤ 36.32 U/ml), group B (patients with either of PLR > 146.82 or CA19-9 > 36.32 U/ml) and group C (patients with PLR > 146.82 and CA19-9 > 36.32 U/ml) were 83.6%, 58.6%, 22.5%, 52.4%, 19.5%, 11.5%, and 42.3%, 11.9%, 0%, respectively. The preoperative PLR and serum CA19-9 are associated with prognosis of patients with GBC. The combination of PLR and CA19-9 may serve as a significant prognostic biomarker for GBC patients superior to either PLR or CA19-9 alone.

Expert consensus on the laparoscopic radical resection of gallbladder cancer

The incidence of gallbladder cancer has been increasing. Radial resection is still the most promising curable treatment for patients with gallbladder cancer. Although the techniques required for laparoscopic radical resection of gallbladder cancer have matured, the number of reports is also on the rise, and laparoscopic radical resection of gallbladder cancer is still controversial. To standardize laparoscopic radical resection of gallbladder cancer, the Biliary Surgery Branch, Chinese Society of Surgery, Chinese Medical Association, together with the Chinese Medical Doctor Association in Chinese Committee of Biliary Surgeons, gathered experts to formulate recommendations and consensus on laparoscopic radical resection of gallbladder cancer. This consensus includes several parts: safety, preoperative evaluation, indications, surgical team, positioning of patient and trocars, intraoperative frozen examination, lymph node dissection, liver resection,bile duct resection, etc. Furthermore, suggestions on the principle of treatment, surgical procedures, and precautions were also provided for patients with delayed diagnoses of gallbladder cancer undergoing resection. This consensus aims to offer valuable suggestions for the standardization of laparoscopic radical resection of gallbladder cancer.

Development of new platforms for predicting early recurrence and survival in resected gallbladder cancer

Development of new platforms for predicting early recurrence and survival in resected gallbladder cancer

Post-operative morbidity after neoadjuvant chemotherapy and resection for gallbladder cancer: A national surgical quality improvement program analysis.

Gallbladder cancer is the most common malignancy of the biliary tract. Neoadjuvant chemotherapy (NACT) has improved overall survival by enabling R0 resection. Currently, there is no consensus of guidelines for neoadjuvant therapy in gallbladder cancer. As investigations continue to analyze the regimen and benefit of NACT for ongoing care of gallbladder cancer patients, we examined American College of Surgeons National Surgical Quality Improvement Program (NSQIP) database to determine if there was higher morbidity among the neoadjuvant group within the 30-day post-operative period. We hypothesized patients who underwent NACT were more likely to have higher post-operative morbidity. To investigate the 30-day post-operative morbidity outcomes between patients who received NACT and underwent surgery and patients who only had surgery. A retrospective analysis of the targeted hepatectomy NSQIP data between 2015 and 2019 was performed to determine if NACT in gallbladder cancer increased the risk for post-operative morbidity (bile leak, infection rate, rate of converting to open surgery, etc.) compared to the group who only had surgery. To calculate the odds ratio for the primary and secondary outcomes, a crude logistic regression was performed. Of the 452 patients, 52 patients received NACT prior to surgery. There were no statistically significant differences in the odds of morbidity between the two groups, including bile leak [odds ratio (OR), 0.69; 95% confidence interval (95%CI): 0.16-2.10; P = 0.55], superficial wound infection (OR, 0.58; 95%CI: 0.03-3.02; P = 0.61), and organ space wound infection (OR, 0.63; 95%CI: 0.18-1.63; P = 0.61). There was no significant difference in the risk of 30-day post-operative morbidity between the NACT and surgery group and the surgery only group.

Preoperative risk factors related to relapse-free survival after R0 resection of gallbladder cancer.

566 Background: Gallbladder (GB) cancer shows high prevalence in South Korea, and tends to be fatal. In surgically fit patients, radical resection aiming R0 margin combined with lymphadenectomy is the mainstay of curative-intent therapy. In spite of R0 resection, however, high recurrence rate is observed in GB cancer, demanding a need to find out risk factors related to recurrence after surgery. Methods: This is a single center, retrospective cohort study conducted on 148 patients with GB cancer who underwent R0 resection between January 1st, 2014 and December 31st, 2019. Several variables were analyzed with statistical tools to identify risk factors related to prognosis. Relapse free survival (RFS), defined as time from treatment of disease to any event, was analyzed with Cox regression analysis. Results: Based on statistical analysis, risk factors related to RFS were age over 65 (hazard ratio [HR] 3.82, 95% confidence interval [CI] 1.71 – 8.56, p= .001), glycated hemoglobin (HbA1c) level more than 6.5% (HR 2.72, 95% CI 1.31 – 5.66, p=0.007), surgical T stage more than T3 (HR 5.60, 95% CI 3.05 – 10.25, p&lt;0.001), surgical N stage more than N1 (HR 4.07, 95% CI 2.25 – 7.36, p&lt;0.001), pathologic differentiation of moderate or poor differentiation (HR 2.80, 95% CI 1.46 – 5.37, p=0.002), reversed albumin-globulin ratio (HR 0.16, 95% CI 0.06 – 0.40, p&lt;0.001), and high gamma glutamyl peptidase (GGT) level (HR 1.00, 95% CI 1.00 – 1.00, p&lt;0.001). Conclusions: Advanced pathologic stage and high inflammatory marker levels, reflecting high tumor burden, were related with poor surgical outcome. Interestingly, high HbA1c level was related to reduced RFS as well. In conclusion, active screening for early detection, reducing inflammatory conditions, and managing diabetes might enhance RFS after R0 resection of GB cancer. [Table: see text]

Role of routine frozen biopsy of cystic duct margin in resectable gallbladder cancer without jaundice

Role of routine frozen biopsy of cystic duct margin in resectable gallbladder cancer without jaundice

Perioperative outcomes of robotic radical resection for gallbladder cancer: a single-center case series

Perioperative outcomes of robotic radical resection for gallbladder cancer: a single-center case series

Risk factors influencing recurrence after radical resection for gallbladder cancer with pT2 or deeper

Risk factors influencing recurrence after radical resection for gallbladder cancer with pT2 or deeper

Minimally invasive (MIS) radical cholecystectomy is a feasible approach for resectable gallbladder cancer

Minimally invasive (MIS) radical cholecystectomy is a feasible approach for resectable gallbladder cancer

Prognostic Impact of Neoadjuvant Chemotherapy in Localized or Locoregionally Advanced Gallbladder Cancer: A Population-Based and Propensity Score Matched SEER Analysis.

The effect of neoadjuvant chemotherapy (NACT) in gallbladder cancer (GBC) patients remains controversial. The aim of this study was to assess the impact of NACT on overall survival (OS) and cancer specific survival (CSS) in patients with localized or locoregionally advanced GBC, and to explore possible protective predictors for prognosis. Data for patients with localized or locoregionally advanced GBC (i.e., categories cTx-cT4, cN0-2, and cM0) from 2004 to 2020 were collected from the Surveillance, Epidemiology, and End Results (SEER) database. Patients in the NACT and non-NACT groups were propensity score matched (PSM) 1:3, and the Kaplan-Meier method and log-rank test were performed to analyze the impact of NACT on OS and CSS. Univariable and multivariable Cox regression models were applied to identify the possible prognostic factors. Subgroup analysis was conducted to identify patients who would benefit from NACT. Of the 2676 cases included, 78 NACT and 234 non-NACT patients remained after PSM. In localized or locoregionally advanced GBC patients, the median OS of the NACT and non-NACT was 31 and 16 months (log-rank P < 0.01), and the median CSS of NACT and non-NACT was 32 and 17 months (log-rank P < 0.01), respectively. Longer median OS (31 vs 17 months, log-rank P < 0.01) and CSS (32 vs 20 months, log-rank P < 0.01) was associated with NACT compared with surgery alone. Multivariable Cox regression analysis showed that NACT, stage, and surgery type were prognostic factors for OS and CSS in GBC patients. Subgroup analysis revealed that the survival hazard ratios (HRs) of NACT vs non-NACT for localized or locoregionally advanced GBC patients were significant in most subgroups. NACT may provide therapeutic benefits for localized or locoregionally advanced GBC patients, especially for those with advanced stage, node-positive, poorly differentiated or undifferentiated disease. NACT combined with radical surgery was associated with a survival advantage. Therefore, NACT combined with surgery may provide a better treatment option for resectable GBC patients.

Effects of Cystic Duct Margin Involvement on the Survival Rates of Patients With Gallbladder Cancer: A Propensity Score-Matched Case-Control Study.

Background In gallbladder cancer (GBC), extrahepatic bile duct (EHBD) resection is selectively performed if gross direct extension or microscopic involvement of the cystic duct margin (CDM) is detected. Although CDMis usually sent for frozen biopsy intraoperatively in most centers, there are no studies regarding the routine use of CDM frozen biopsy irrespective of the tumor location and paucity of literature regarding the impact ofCDM status on recurrence-free and overall survival inGBC. The presence of obstructive jaundice in GBC usually indicates the involvement of EHBD or cystic duct-bile duct junction. The present study aimed to analyze the necessity of routineCDM frozen biopsy inpatients with resectable GBC withoutjaundice, regardless of the tumor location. The impact of positive CDM on survival was also evaluated. Methods This retrospective observational case-control study was conducted from May 2009 to March 2021 and included 105 patients with resectable GBC without macroscopic EHBD infiltration andjaundice. Patients were divided into CDM-negative (n=91) and CDM-positive (n=14) groups. Propensity score matchingwas performed for variables such asperformance status, tumor size, tumor-node-metastasis (TNM) stage, and adjuvant chemotherapy. After propensity score matching, 27 patients (CDM-negative=13, CDM-positive=14) were included. The primary outcome was to analyze the role of routine CDM frozen biopsy regardless of tumor location, and secondary outcomes were to study the impact of positive CDM status on survival andevaluate predictive factors for CDM positivity. A subgroup analysis was conducted to assess clinicopathologic characteristics and outcomes of the anatomical location of the tumor. Results Of 105 patients, 91 had negative CDM, and 14 had positive CDM. Among 14 patients with positive CDM, only one patient had a tumor in the fundus/body, and the remaining had a tumor involving the neck. All CDM-positive patients underwent bile duct excision with hepaticojejunostomy. Common bile duct (CBD) involvement was present in 50% of patients with positive CDM in the final histopathological examination. In the matched population, patients with positive CDM had a significantly higher rate of neck tumors (p=0.001). Recurrence-free survival (24 vs. 12 months, p=0.30) and overall survival (24.5 vs. 20 months, p=0.417) were comparable between CDM-negative and CDM-positive groups, respectively. On multivariate analysis, preoperative and intraoperative tumor location were independent predictive factors for CDM positivity. On subgroup analysis, 30 patients had tumor involving the neck of the gallbladder, and the remaining 75 had at the fundus and body of the gallbladder. Neck tumors had inferior recurrence-free survival (17 vs. 30 months, p=0.012) and overall survival (24 vs. 36 months, p=0.048) compared to non-neck tumors. Conclusions Routine use of CDM frozen analysis in patients with resectable GBC without jaundice, regardless of tumor location, can be avoided. Itcan be selectively preferred in patients with GBC involving the neck since tumor location is found to be an independent predictive factorfor CDM positivity. Positive CDM has comparable survival outcomes to negative CDM, providing a similarR0 resection rate and tumor stage.However, neck tumors have aworse prognosis than non-neck tumors.

166P Preoperative risk factors strongly related to early recurrence after R0 resection of gallbladder cancer

166P Preoperative risk factors strongly related to early recurrence after R0 resection of gallbladder cancer