Citations

ABSTRACT Background Readmission is considered as a surgical quality indicator. More data regarding predictors of readmission and outcomes after surgery for colorectal liver metastasis are needed. Using a propensity score match to create a 1:2 match of cases:controls for 90‐day. Readmission, the matching variables used for balance included age, tumor size, estimated blood loss, and type of resection (minor or major). T‐tests were used for continuous measures, Fisher's exact test was used for categorical data, and the Kaplan–Meier method was used to estimate survival. p < 0.05 was considered significant. Methods Retrospectively examined 935 patients with CLM from 2000 to 2018. Using a propensity score match to create a 1:2 match of cases:controls for 90‐day. Readmission, the matching variables used for balance included age, tumor size, estimated blood loss, and type of resection (minor or major). T‐tests were used for continuous measures, Fisher's exact test was used for categorical data, and the Kaplan–Meier method was used to estimate survival. p < 0.05 was considered significant. Results 935 patients were included in the initial sample with 896 eligible for inclusion in the propensity matching. The average age of the population was 59% and 59% male. Overall readmission rate was 8.0%. Median time to readmission was 14 days. In the propensity score matched sample, readmitted patients had higher rates of organ space infection (28% vs 2% and p < 0.0001), bile leak (26% vs 1% and p < 0.0001), and liver failure (9% vs 2% and p = 0.042). There was no difference in LOS (7 days versus six days and p = 0.40), overall survival (median 39.7 vs 41.0 months and p = 0.79), or rate of adjuvant therapy (68% for both and p > 0.99). Conclusion Patients readmitted for intermediate and late complications after surgery for CLM can recover and receive adjuvant therapy with no adverse effect on overall survival. Organ space infection, bile leak, and liver failure are highly associated with readmission.

AbstractBackgroundThis study investigates the impact of margin status after colorectal liver metastasis (CLM) resection on outcomes of patients after neoadjuvant treatment versus those who underwent upfront resection.MethodsAn international collaborative database of CLM patients who underwent surgical resection was used. Proportional hazard regression models were created for single and multivariable models to assess the relationship between independent measures and median overall survival (mOS).ResultsR1 was associated with worse OS in the neoadjuvant group (mOS: 51.8 m for R0 vs. 26.0 m for R1; HR: 2.18). In the patients who underwent upfront surgery, R1 was not associated with OS. (mOS: 46.7 m for R0 vs. 42.6 m for R1). When patients with R1 in each group were stratified by adjuvant treatment, there was no significant difference in the neoadjuvant group, while in the upfront surgery group with R1, adjuvant treatment was associated with significant improvement in OS (mOS: 42.6 m for adjuvant vs. 25.0 m for no adjuvant treatment; HR: 0.21).ConclusionR1 is associated with worse outcomes in the patients who receive neoadjuvant treatment with no significant improvement with the addition of adjuvant therapy, likely representing an aggressive tumor biology. R1 did not impact OS in patients with upfront surgery who received postoperative chemotherapy.

AbstractBackgroundThermal ablation has recently become a key therapy for the treatment of colorectal liver metastasis (CLM). However, the role of ablation in combination with resection has not yet been firmly established. We hypothesize that in patients with CLM, those who undergo liver resection with ablation (RA) have similar outcomes compared with those who undergo liver resection only.MethodsWe reviewed a multicenter international database of 906 surgical procedures for CLM from 5 high volume hepatobiliary surgical units. Patients undergoing RA (n = 63) were matched based on the number of lesions and tumor size using a 1:1 balanced propensity score analysis with those having resection only (n = 63). Our primary outcomes were overall survival (OS) and disease‐free survival (DFS).ResultsThe mean age of our cohort was 58 ± 11 years, with 43% females. With a median follow‐up of 70.8 months, patients in the resection and RA group had a median OS of 45.1 and 54.8 months (p = 0.71), respectively. The median DFS was 22.7 and 14.2 months (p = 0.045), respectively. Using a multivariate Cox proportional hazards regression model, the treatment approach was not associated with OS (p = 0.94) or DFS (p = 0.059). A higher number of lesions is independently associated with worse DFS (hazard ratio: 1.12, p < 0.01). When there was disease recurrence, the region of recurrence was similar between the RA versus resection only groups (p = 0.27), but there was a shorter time to recurrence in the RA group (p = 0.002).ConclusionFor CLM, the treatment approach was not significantly associated with OS or DFS, while tumor biology likely played an important role. Prospective research on the quality and effectiveness of thermal ablation combined with hepatic resection is warranted.

BACKGROUND: Surgical intervention remains the cornerstone of a multidisciplinary approach in the treatment of colorectal liver metastases (CLM). Nevertheless, patient outcomes vary greatly. While predictive tools can assist decision-making and patient counseling, decades of efforts have yet to result in generating a universally adopted tool in clinical practice. STUDY DESIGN: An international collaborative database of CLM patients who underwent surgical therapy between 2000 and 2018 was used to select 1,004 operations for this study. Two different machine learning methods were applied to construct 2 predictive models for recurrence and death, using 128 clinicopathologic variables: gradient-boosted trees (GBTs) and logistic regression with bootstrapping (LRB) in a leave-one-out cross-validation. RESULTS: Median survival after resection was 47.2 months, and disease-free survival was 19.0 months, with a median follow-up of 32.0 months in the cohort. Both models had good predictive power, with GBT demonstrating a superior performance in predicting overall survival (area under the receiver operating curve [AUC] 0.773, 95% CI 0.743 to 0.801 vs LRB: AUC 0.648, 95% CI 0.614 to 0.682) and recurrence (AUC 0.635, 95% CI 0.599 to 0.669 vs LRB: AUC 0.570, 95% CI 0.535 to 0.601). Similarly, better performances were observed predicting 3- and 5-year survival, as well as 3- and 5-year recurrence, with GBT methods generating higher AUCs. CONCLUSIONS: Machine learning provides powerful tools to create predictive models of survival and recurrence after surgery for CLM. The effectiveness of both machine learning models varies, but on most occasions, GBT outperforms LRB. Prospective validation of these models lays the groundwork to adopt them in clinical practice.

AbstractBackgroundResection of colorectal liver metastasis (CLM) is beneficial when feasible. However, the benefit of second hepatectomy for hepatic recurrence in CLM remains unclear.MethodsThe Colorectal Liver Operative Metastasis International Collaborative retrospectively examined 1004 CLM cases from 2000 to 2018 from a total of 953 patients. Hepatic recurrence after initial hepatectomy was identified in 218 patients. Kaplan–Meier analysis was performed for overall survival (OS) and recurrence‐free survival (RFS). Propensity score matching (PSM) was performed to offset selection bias. Cox proportional‐hazards regression was performed to identify risk factors associated with OS.ResultsA total of 51 patients underwent second hepatectomy. Unadjusted median OS was 60.1 months in repeat‐hepatectomy versus 38.3 months in the single‐hepatectomy group (p = 0.015). In the PSM population, median OS remained significantly better in the repeat‐hepatectomy group (60.1 vs. 33.1 months; p = 0.0023); median RFS was 12.4 months for the repeat‐hepatectomy group, versus 9.8 months in the single‐hepatectomy group (p = 0.0050). Repeat hepatectomy was associated with lower risk of death (hazard ratio: 0.283; p = 0.000012). Obesity, tobacco use, and high intraoperative blood loss were associated with significant risk of death (p < 0.05).ConclusionIn CLM with hepatic recurrence, second hepatectomy was beneficial for OS. With PSM, the OS benefit of performing a second hepatectomy remained significant.

AbstractBackgroundChemotherapy has been increasingly combined with surgery as multimodality treatment for resectable colorectal‐liver metastases (CLM). There is paucity of clinical data addressing optimal timing of chemotherapy relative to surgery. We examined outcomes of patients undergoing hepatectomy for resectable CLM.MethodsSeven hundred and eighteen patients treated with hepatectomy for CLM were analyzed from five hepatobiliary institutions between 2000 and 2018. Overall survival (OS) was measured from time of hepatectomy for patients receiving: surgery alone, neoadjuvant, adjuvant, and neoadjuvant‐plus‐adjuvant (perioperative) chemotherapy. Kaplan–Meier analysis was performed to detect differences in OS between treatment groups. Single‐ and multi‐variable analysis with Cox proportional hazards were run for OS between groups.ResultsOne hundred and thirty‐seven patients (19.08%) received surgery, 104 (14.48%) received neoadjuvant‐only, 214 (29.81%) received adjuvant‐only, and 263 (36.63%) received perioperative chemotherapy; with median OS of 48.20, 46.83, 56.27, and 49.93 months, respectively. No differences in median OS were seen between groups on Kaplan–Meier analysis. No significant difference in Charlson‐Deyo comorbidity status was seen between groups (p = 0.853), while significant difference was seen in maximum tumor size (p = 0.0023). On multivariate analysis, adjuvant (p = 0.010) and perioperative (p = 0.020) chemotherapy were independently associated with OS compared to surgery alone.DiscussionDespite group differences, chemotherapy after surgery was independently associated with improved OS in CLM.

The NCCN Guidelines for Pancreatic Adenocarcinoma discuss the diagnosis and management of adenocarcinomas of the exocrine pancreas and are intended to assist with clinical decision-making. These NCCN Guidelines Insights discuss important updates to the 2019 version of the guidelines, focusing on postoperative adjuvant treatment of patients with pancreatic cancers.