Interval Sentinel Lymph Nodes With the Use of Routine Lymphoscintigraphy in Extremity Melanoma.

INTRODUCTION: Lymphoscintigraphy (LS) helps identify drainage to interval (epitrochlear or popliteal) lymph node basins for extremity melanomas. This study evaluated how often routine LS evaluation identified an interval sentinel lymph node (SLN) and how often that node was found to have metastasis. METHODS: A single institution, retrospective study identified patients with an extremity melanoma who underwent routine LS and SLN biopsy over a 25-y period. Comparisons of factors associated with the identification of interval node drainage and tumor status were made. RESULTS: In 634 patients reviewed, 5.7% of patients drained to an interval SLN. Of those biopsied, 29.2% were positive for micrometastases. Among patients with biopsies of both the traditional and interval nodal basins, nearly 20% had positive interval nodes with negative SLNs in the traditional basin. Sex, age, thickness, ulceration, and the presence of mitotic figures were not predictive of identifying an interval node on LS, nor for having disease in an interval node. Anatomic location of the primary melanoma was the only identifiable risk factor, as no interval nodes were identified in melanomas of the thigh or upper arm (P ≤ 0.001). CONCLUSIONS: Distal extremity melanomas have a moderate risk of mapping to an interval SLN. Routine LS should be considered in these patients, especially as these may be the only tumor-positive nodes. However, primary extremity melanomas proximal to the epitrochlear or popliteal nodal basins do not map to interval nodes, and improved savings and workflow could be realized by selectively omitting routine LS in such patients.

Barriers to resection following neoadjuvant chemotherapy for resectable pancreatic adenocarcinoma: A national and local perspective.

BACKGROUND: Neoadjuvant chemotherapy (NAC) use for pancreatic ductal adenocarcinoma (PDAC) has increased, but some patients never get resection following NAC. METHODS: Data from January 2012 to December 2019 for all clinically resectable patients across two health networks were utilized, as well as data from the ACS NCDB registry. Univariate testing, multivariable logistic regression, and survival analyses were employed to evaluate failure to resection after neo-adjuvant chemotherapy. RESULTS: Of the 10 007 registry patients eligible for resection, the resected group was younger (64.6 vs. 69.5 years; p < 0.001) and had a slightly lower mean comorbidity index (0.41 vs. 0.45; p < 0.001) than the nonsurgical group. The nonsurgical group was composed of a higher percentage of Black and Hispanic patients (17.5 vs. 13.1%; p < 0.001). After adjusting for age and comorbidities, the factors associated with decreased probability of resection after NAC were evaluation at a community hospital (OR 2.4), Black or Hispanic race (OR 1.6), areas of increased high school drop-out rates (OR 1.4), and lack of private health insurance (OR 1.3). The median overall survival for nonsurgery was markedly worse than the surgical cohort (10.6 vs. 26.6 months; p < 0.001). The most frequent reasons for a lack of definitive resection were operative upstaging to unresectable (39.6%), patient preference (14.5%), progression on NAC (13.2%), deconditioning or comorbidity severity (12.5%), and nonreferral to a surgeon (8.8%). CONCLUSIONS: Racial, economic, and educational disparities have a considerable influence on the successful completion of a neoadjuvant approach for resectable PDAC. A comprehensive closed or highly collaborative/communicative multidisciplinary neoadjuvant program is optimal for treatment success and completion.

Combined pre-operative risk score predicts pancreatic leak after pancreatic resection.

BACKGROUND: Post-operative pancreatic fistula (POPF) is a major complication following pancreatectomy and is currently difficult to predict pre-operatively. This study aims to validate pre-operative risk factors and develop a novel combined score for the prediction of POPF in the pre-operative setting. METHODS: Data were collected from 2016 to 2021 for radiologic main pancreatic duct diameter (MPD), body mass index (BMI), physical status classified by American Society of Anesthesiologists (ASA), polypharmacy, mean platelet ratio (MPR), comorbidity-polypharmacy score (CPS), and a novel Combined Pancreatic Leak Prediction Score (CPLPS) (derived from MPD diameter, BMI, and CPS) were obtained from pre-operative data and analyzed for their independent association with POPF occurrence. RESULTS: In total, 166 patients who underwent pancreatectomy with pancreatic leak (Grade A, B, and C) occurring in 51(30.7%) of patients. Pre-operative radiologic MPD diameter < 4 mm (p < 0.001), < 5 mm (p < 0.001), < 6 mm (p = 0.001), BMI ≥ 25 (p = 0.009), and ≥ 30 (p = 0.017) were independently associated with the occurrence of pancreatic leak. CPLPS was also predictive of pancreatic leak following pancreatectomy on univariate (p = 0.005) and multivariate analysis (p = 0.036). CONCLUSION: MPD and BMI were independent risk factors predictive for the development of pancreatic leak. CPLPS, was an independent predictor of pancreatic leak following pancreatectomy and could be used to help guide surgical decision making and patient counseling.

Preventing Futile Liver Resection: A Risk-Based Approach to Surgical Selection in Major Hepatectomy for Colorectal Cancer.

BACKGROUND: Early recurrence following liver resection for metastatic colorectal cancer generally portends poor survival. We sought to identify factors associated with early disease recurrence after major hepatectomy for metastatic colorectal cancer in order to improve patient selection and prevent futile hepatectomy. METHODS: Sequential major (four or more segments) liver resections performed for metastatic colorectal cancer between 1995 and 2019 were selected from our prospectively maintained database. Univariate analyses, multivariable regression modelling, and survival analyses were used to identify predictors of futile resection (recurrence within 6 months of hepatectomy). RESULTS: Of 259 patients included, the median age was 61.3 years (interquartile range [IQR] 15.3) and the median number of liver tumors was 3.0 (IQR 2.0); 78.0% of patients received prehepatectomy chemotherapy. Surgeries were right (56.4%), left (19.3%), and extended hepatectomy (24.3%). Futile resection occurred in 26 (12.6%) patients. Margin positivity was similar in the futile resection group compared with the non-futile resection group (11.5% vs. 11.4%). Extrahepatic disease that disappeared with chemotherapy was present in 23.1% of patients with a futile resection and 7.2% of those without (p = 0.019). After multivariable regression, the factors predictive of futile resection were extrahepatic disease (odds ratio [OR] 5.6; p = 0.004), more than three liver lesions (OR 4.9; p = 0.001), and extended hepatectomy (OR 2.6; p = 0.038). Notably, 70.8% of futile recurrences occurred within the liver remnant and 20.8% were pulmonary metastases. Overall survival was 11.7 months (95% confidence interval [CI] 7.1-16.2) for the futile resection cohort versus 45.6 (95% CI 39.1-52.1) for non-futile hepatectomies (p < 0.001). CONCLUSIONS: Futile hepatic resection can be predicted based on preoperative factors and carries a poor prognosis. Improved risk stratification for futility will aid in patient selection and treatment discussions.

Drug-Eluting Bead, Irinotecan Therapy of Unresectable Intrahepatic Cholangiocarcinoma (DELTIC) with Concomitant Systemic Gemcitabine and Cisplatin.

BACKGROUND: Unresectable intrahepatic cholangiocarcinoma (ICC) carries a poor prognosis, and currently there are moderately established chemotherapeutic [gemcitabine/cisplatin (Gem/Cis)] treatments to prolong survival. The purpose of this study was to assess the efficacy of irinotecan drug-eluting beads (DEBIRI) therapy by transarterial infusion in combination with systemic therapy in unresectable ICC. PATIENTS AND METHODS: This is a prospective, multicenter, open-label, randomized phase II study (Clin Trials: NCT01648023-DELTIC trial) of patients with ICC randomly assigned to Gem/Cis with DEBIRI or Gem/Cis alone. The primary endpoint was response rate. RESULTS: The intention-to-treat population comprised 48 patients: 24 treated with Gem/Cis and DEBIRI and 22 with Gem/Cis alone (2 screen failures). The two groups were similar with respect to the extent of liver involvement (35% versus 38%) and presence of extrahepatic disease (29% versus 14%, p = 0.12). Median numbers of chemotherapy cycles were similar (6 versus 6), as were rates of grade 3/4 adverse events (34% for the Gem/Cis-DEBIRI group versus 36% for the Gem/Cis group). The overall response rate was significantly greater in the Gem/Cis-DEBIRI arm versus the Gem/Cis arm at 2 (p < 0.04), 4 (p < 0.03), and 6 months (p < 0.05). There was significantly more downsizing to resection/ablation in the Gem/Cis-DEBIRI arm versus the Gem/Cis arm (25% versus 8%, p < 005), and there was improved median progression-free survival [31.9 (95% CI 8.5-75.3) months versus 10.1 (95% CI 5.3-13.5) months, p = 0.028] and improved overall survival [33.7 (95% CI 13.5-54.5) months versus 12.6 (95% CI 8.7-33.4) months, p = 0.048]. CONCLUSION: Combination Gem/Cis with DEBIRI is safe, and leads to significant improvement in downsizing to resection, improved progression-free survival, and overall survival.

Locally advanced pancreatic cancer: a reliable contraindication to resection in the modern era?

BACKGROUND: The aim of this study is to present radiologically designated LAPC found to be resectable upon surgical exploration and evaluate the outcomes of such resections. METHODS: Sequential LAPC patients between 2013 and 2019 were staged and underwent resection were included in the analysis of both perioperative and long-term outcomes. RESULTS: Twenty-eight patients with radiologically-designated LAPC underwent surgical resection after chemotherapy with a median follow-up of 31.7 m,75% underwent pancreaticoduodenectomy. The margin positivity and local recurrence rates were 21.4% and 35.7%, respectively. When compared to the 30 BRPC controls, the LAPC group had a higher rates of an arterial resection (11vs.1; p = 0.002), but the groups were similar with regard to all other preoperative and intraoperative variables (p < 0.05). Perioperative morbidity rates were similar (25.9%vs21.4%; p = 0.53). The LAPC and BRPC groups were also equivalent with respect to median recurrence-free survival (9.0mo; 95%CI 6.3, 11.7vs.8.3mo; 95%CI 5.4, 11.2) and median overall survival (19.9mo; 95%CI 17.0, 22.7 vs. 19.9mo; 95%CI 14.8, 25.1), respectively. CONCLUSION: Despite a radiologic designation of locally advanced pancreatic cancer, certain subtypes of LAPC warrant surgical exploration provided the operative surgeon is prepared for major arterial and/or venous resection. Pancreatectomy in these patients has acceptable morbidity and oncologic outcomes, similar to patients who are radiologically borderline resectable.

Using machine learning to preoperatively stratify prognosis among patients with gallbladder cancer: a multi-institutional analysis.

BACKGROUND: Gallbladder cancer (GBC) is an aggressive malignancy associated with a high risk of recurrence and mortality. We used a machine-based learning approach to stratify patients into distinct prognostic groups using preperative variables. METHODS: Patients undergoing curative-intent resection of GBC were identified using a multi-institutional database. A classification and regression tree (CART) was used to stratify patients relative to overall survival (OS) based on preoperative clinical factors. RESULTS: CART analysis identified tumor size, biliary drainage, carbohydrate antigen 19-9 (CA19-9) levels, and neutrophil-lymphocyte ratio (NLR) as the factors most strongly associated with OS. Machine learning cohorted patients into four prognostic groups: Group 1 (n = 109): NLR ≤1.5, CA19-9 ≤20, no drainage, tumor size <5.0 cm; Group 2 (n = 88): NLR >1.5, CA19-9 ≤20, no drainage, tumor size <5.0 cm; Group 3 (n = 46): CA19-9 >20, no drainage, tumor size <5.0 cm; Group 4 (n = 77): tumor size <5.0 cm with drainage OR tumor size ≥5.0 cm. Median OS decreased incrementally with CART group designation (59.5, 27.6, 20.6, and 12.1 months; p < 0.0001). CONCLUSIONS: A machine-based model was able to stratify GBC patients into four distinct prognostic groups based only on preoperative characteristics. Characterizing patient prognosis with machine learning tools may help physicians provide more patient-centered care.

An Improved Staging System for Locally Advanced Pancreatic Cancer: A Critical Need in the Multidisciplinary Era.

BACKGROUND: Locally-advanced pancreatic cancer (LAPC) is traditionally considered stage III unresectable disease. Advances in induction systemic therapy regimens, surgical technique, and perioperative care have led to successful resection of an increasing number of these tumors with reasonable perioperative outcomes and disease-free intervals. Certain anatomic characteristics that meet criteria for locally-advanced disease, however, are more likely to result in a successful surgical outcome. METHODS: A practical and consistent system is needed to communicate such nuance between surgical and nonsurgical oncologists for optimal treatment planning and to improve recording for cancer registries and research studies. RESULTS: The present study proposes a novel subclassification system for stage III pancreatic cancers based on their pattern of vascular involvement and examines the current evidence for resection in each scenario. Introducing needed detail into the current catch-all stage III categorization will help to direct patient referrals and increase the body of knowledge about the variable presentations of this complex malignancy. CONCLUSION: This proposed staging revision for LAPC is designed to convey more actionable tumor descriptions for treating oncologists, clinical trial eligibility, and surgical patient selection in the era of effective induction systemic therapy.

A literature-based treatment algorithm for low-grade neuroendocrine liver metastases.

BACKGROUND: The optimal timing of treatment of liver metastases from low-grade neuroendocrine tumors (LG-NELM) varies significantly due to numerous treatment modalities and the literature supporting various treatment(s). This study sought to create and validate a literature-based treatment algorithm for LG-NELM. METHODS: A treatment algorithm to maximize overall survival (OS) was designed using peer-reviewed articles evaluating treatment of LG-NELM. This algorithm was retrospectively applied to patients treated for LG-NELM at our institution. Deviation was determined based on whether or not a patient received treatment consistent with that recommended by the algorithm. Patients who did and did not deviate from the algorithm were compared with respect to OS and number of treatments. RESULTS: Applying our algorithm to a 149-patient cohort, 57 (38%) deviated from recommended treatment. Deviation occurred in the form of alternative (28, 49%) versus additional procedures (29, 51%). Algorithm deviators underwent significantly more procedures than non-deviators (median 1 vs. 2, p < 0.001). Cox model indicated no difference in OS associated with algorithm deviation (HR 1.19, p = 0.58) when controlling for age and tumor characteristics. CONCLUSION: This literature-based algorithm helps standardize treatment protocols in patients with LG-NELM and can reduce cost and risk by minimizing unnecessary procedures. Prospective implementation and validation is required.

The Sunbelt Melanoma Trial.

The Sunbelt Melanoma Trial, a multicenter, prospective randomized clinical study, evaluated the role of high-dose interferon alfa-2b (HDI) therapy for patients with a single positive sentinel lymph node (SLN) metastasis treated with a completion lymph node dissection (CLND). A second protocol in the trial evaluated the prognostic significance of using molecular markers to identify submicroscopic metastases in sentinel lymph nodes that were negative by routine pathologic analysis. The role of CLND with or without adjuvant HDI was evaluated in this group of patients. The results of the study demonstrated that adjuvant HDI offered no survival benefit for patients with a single positive SLN in terms of disease-free or overall survival. Molecular staging using polymerase chain reaction (PCR) for melanoma markers did not identify a high-risk group of patients at increased risk of melanoma recurrence. Additional treatment of these patients who were PCR-positive with either CLND alone or CLND plus HDI did not improve their survival. Additional studies from the Sunbelt Melanoma Trial helped to validate the operational standards of the SLN biopsy procedure and defined the complication rates for both SLN biopsy and CLND. A prognostic risk calculator has been developed from trial data, and the importance of different micrometastatic tumor burden measurements was reported. Although the Sunbelt Melanoma Trial did not demonstrate an improvement in survival with HDI, it is an important trial that highlights the significance of surgeon-initiated randomized clinical trials that incorporate surgical techniques, molecular biomarkers, and adjuvant therapy.

Impact of Perfusate Glucose Concentration on Perioperative Outcomes in Patients Undergoing Cytoreductive Surgery and Hyperthermic Intraperitoneal Chemotherapy.

BACKGROUND: Cytoreductive surgery and hyperthermic intraperitoneal chemotherapy (CRS/HIPEC) is a common treatment for peritoneal surface malignancies but no standard carrier solution currently exists for the procedure. This study compared a standard low-dextrose perfusate to a higher-dextrose dialysate that has previously shown favorable impact on perioperative patient outcomes in trauma settings. MATERIALS AND METHODS: A single-center retrospective study identified patients undergoing CRS/HIPEC from 2008 to 2019 with recorded dextrose concentration of administered perfusate. An institutional shift to a higher-dextrose solution was made in late 2015. Comparisons of preoperative factors, intraoperative and postoperative glucose levels, and postoperative outcomes were made using the chi-square test, Fisher's exact test, Wilcoxon rank sum test, or repeated measures analysis of variance. RESULTS: There were 97 patients in the study, 73 (75%) in the low-dextrose group and 24 (25%) in the high-dextrose group. There was no significant difference in peak intraoperative blood glucose levels between the 1.5% (mean 230 mg/dL) and the 2.5% group (mean 199 mg/dL, P = 0.15). Daily postoperative glucose values were also not statistically different (repeated measures analysis of variance, P = 0.18). Median length of stay was slightly lower for the high-dextrose group (10 d, interquartile range 8-15) than that for the low-dextrose group (12 d, interquartile range 9-17), but was not statistically significant (P = 0.29). Return of bowel function and resumption of diet were similar between the groups. The high-dextrose group had a lower rate of overall complications (20.8%) than the low-dextrose group (49.3%, P = 0.0143). Ninety-day mortality was equivalent between the two groups (2.7% low-dextrose, 4.2% high-dextrose, P = 1.0). CONCLUSIONS: Use of 2.5% dextrose-containing perfusate appears safe for CRS/HIPEC operations, does not negatively impact intraoperative or postoperative glucose levels, and may be associated with a decreased risk of complications.

Optimal perfusion chemotherapy: A prospective comparison of mitomycin C and oxaliplatin for hyperthermic intraperitoneal chemotherapy in metastatic colon cancer.

BACKGROUND: Peritoneal carcinomatosis of colorectal adenocarcinoma (CRC) origin is common and is the second-most frequent cause of death in colorectal cancer. There is survival benefit to surgical resection plus hyperthermic intraperitoneal chemotherapy (HIPEC) for patients with metastatic CRC. However, there remains controversy between oxaliplatin (Oxali) and mitomycin C (MMC), as the agent of choice. METHODS: A review of our 285 patients prospective HIPEC database from July 2007 to May 2018 identified 48 patients who underwent cytoreductive surgery plus HIPEC with MMC or Oxali. Patients were stratified based on preoperative and postoperative peritoneal cancer indices (PCI). The primary outcomes of survival and progression-free survival were compared. RESULTS: Type of HIPEC chemotherapy was not found to be predictive of overall survival. Preoperative PCI (P = .04), preoperative response to chemotherapy (P = .0001), and postoperative PCI (P = .05) were predictive for overall survival. CONCLUSIONS: MMC or Oxali based HIPEC chemotherapy are both safe and effective for the management of peritoneal only metastatic CRC. Both perfusion therapies should be considered with all patients receiving modern induction chemotherapy.

Primitive neuroectodermal tumor incidence, treatment patterns, and outcome: An analysis of the National Cancer Database.

BACKGROUND: Primitive neuroectodermal tumors (PNETs) comprise less than 1% of all sarcomas. The rarity of this disease has resulted in a paucity of information about disease process and management. This study sought to evaluate the incidence, treatment patterns, and outcomes among patients with PNET. METHODS: The National Cancer Database was queried for diagnoses of PNET between 2004 and 2014. Patients were dichotomized based on tumor type (central [cPNET] vs peripheral [pPNET]). Demographic, tumor, treatment, and outcome variables were analyzed for the entire patient cohort and by type of PNET. RESULTS: White (86.4%) males (56.6%) represented the majority of patients. The incidence of PNET remained stable over the study period (r2 = 0.0821). A total of 70.7% underwent surgical resection of the primary site, 50.3% received radiation, and 74.7% received systemic chemotherapy. Compared to those with pPNET, patients with cPNET more often received radiation treatment (P < .001), primary tumor resection (P < .001), and experienced increased 90-day mortality (P < .014). CONCLUSION: cPNET and pPNET are rare and aggressive malignancies that tend to arise in White males. Multimodal treatment including surgery, chemotherapy, and radiation is conventional. Patients with cPNET more often receive radiation and primary tumor resection with increased 90-day mortality.

Correlating serum alpha-fetoprotein in hepatocellular carcinoma with response to Yttrium-90 transarterial radioembolization with glass microspheres (TheraSphere™).

BACKGROUND: Few studies have assessed the relationship between serum alpha-fetoprotein (AFP) and yttrium-90 (Y-90) radioembolization response in hepatocellular carcinoma (HCC). The objective of the study was to evaluate whether peri-procedural serum AFP was correlated with Y-90 therapy response in HCC. METHODS: Patients undergoing Y-90 radioembolization with glass microspheres (TheraSphere™) for HCC between 2006 and 2013 at a single center were evaluated. The relationship between AFP and 6-month radiographic improvement (complete or partial response by modified RECIST criteria), overall (OS), and disease-specific survival (DSS) were analyzed. RESULTS: Seventy-four patients underwent a total of 124 Y-90 infusions. Median age was 65 years, median AFP was 37 ng/mL (range: 2-112,593 ng/mL) and median model for end-stage liver disease score was 6.2 (range:1.8-11.2). Increased AFP was not associated with radiographic improvement (odds ratio (OR) = 0.99, 95% confidence interval (CI) = 0.75-1.30, p = 0.92). Median OS was 15.2 months and was increased in patients with low AFP compared to high AFP (30.8 months vs. 7.8 months, p < 0.001). On multivariable regression analysis, increased AFP was associated with worse OS (OR = 1.11, 95%CI = 1.01-1.22, p = 0.034) and DSS (OR = 1.13, 95%CI = 1.03-1.25, p = 0.018). CONCLUSION: Pre-infusion AFP independently predicted survival after Y-90 treatment for HCC, but not radiographic response, and can help guide treatment decisions.

Survival Outcomes Associated With Clinical and Pathological Response Following Neoadjuvant FOLFIRINOX or Gemcitabine/Nab-Paclitaxel Chemotherapy in Resected Pancreatic Cancer.

OBJECTIVE: To compare the survival outcomes associated with clinical and pathological response in pancreatic ductal adenocarcinoma (PDAC) patients receiving neoadjuvant chemotherapy (NAC) with FOLFIRINOX (FLX) or gemcitabine/nab-paclitaxel (GNP) followed by curative-intent pancreatectomy. BACKGROUND: Newer multiagent NAC regimens have resulted in improved clinical and pathological responses in PDAC; however, the effects of these responses on survival outcomes remain unknown. METHODS: Clinicopathological and survival data of PDAC patients treated at 7 academic medical centers were analyzed. Primary outcomes were overall survival (OS), local recurrence-free survival (L-RFS), and metastasis-free survival (MFS) associated with biochemical (CA 19-9 decrease ≥50% vs <50%) and pathological response (complete, pCR; partial, pPR or limited, pLR) following NAC. RESULTS: Of 274 included patients, 46.4% were borderline resectable, 25.5% locally advanced, and 83.2% had pancreatic head/neck tumors. Vein resection was performed in 34.7% and 30-day mortality was 2.2%. R0 and pCR rates were 82.5% and 6%, respectively. Median, 3-year, and 5-year OS were 32 months, 46.3%, and 30.3%, respectively. OS, L-RFS, and MFS were superior in patients with marked biochemical response (CA 19-9 decrease ≥50% vs <50%; OS: 42.3 vs 24.3 months, P < 0.001; L-RFS-27.3 vs 14.1 months, P = 0.042; MFS-29.3 vs 13 months, P = 0.047) and pathological response [pCR vs pPR vs pLR: OS- not reached (NR) vs 40.3 vs 26.1 months, P < 0.001; L-RFS-NR vs 24.5 vs 21.4 months, P = 0.044; MFS-NR vs 23.7 vs 20.2 months, P = 0.017]. There was no difference in L-RFS, MFS, or OS between patients who received FLX or GNP. CONCLUSION: This large, multicenter study shows that improved biochemical, pathological, and clinical responses associated with NAC FLX or GNP result in improved OS, L-RFS, and MFS in PDAC. NAC with FLX or GNP has similar survival outcomes.

Age and Lymphovascular Invasion Accurately Predict Sentinel Lymph Node Metastasis in T2 Melanoma Patients.

BACKGROUND: The risk of sentinel lymph node (SLN) metastasis in melanoma is related directly to tumor thickness and inversely to age. The authors hypothesized that for T2 (thickness 1.1-2.0 mm) melanoma, age, and other factors may be able to identify a cohort of patients with a low risk of SLN metastases. METHODS: The authors developed logistic regression models to predict positive SLNs in patients undergoing SLN biopsy for T2 melanoma using the National Cancer Database. Classification and regression-tree analysis were used to identify groups of patients with high and low risk for SLN metastases. The prediction model then was applied to a separate data set from a multicenter randomized clinical trial. RESULTS: The study identified 12,918 patients with T2 melanoma undergoing SLN biopsy with clinically node-negative melanoma. In the multivariable analysis, increasing thickness, younger age, lymphovascular invasion (LVI), mitotic rate of 1/mm2 or more, axial location, and Clark level of 4 or 5 were independent risk factors for SLN metastases. A cohort based on age (> 56 years) and no LVI was identified with a relatively low risk (7.8%; 95% confidence interval 7.2-8.4%) of SLN metastases. The independent data set of 1531 patients with T2 melanoma confirmed these findings. Among elderly patients (age > 75 years) with melanoma 1.2 mm or smaller and no LVI, the risk of a positive SLN was 4.9% (95% confidence interval 3.3-7.1%). CONCLUSIONS: Younger age and LVI are powerful predictors of SLN metastases for patients with T2 melanoma. This prediction model can inform shared decision-making regarding whether to perform SLN biopsy for older patients with otherwise low-risk T2 melanoma.

Actual 5-Year Survivors After Surgical Resection of Hilar Cholangiocarcinoma.

BACKGROUND: The prevalence and characteristics of actual 5-year survivors after surgical treatment of hilar cholangiocarcinoma (HC) have not been described previously. METHODS: Patients who underwent resection for HC from 2000 to 2015 were analyzed through a multi-institutional registry from 10 U.S. academic medical centers. The clinicopathologic characteristics and both the perioperative and long-term outcomes for actual 5-year survivors were compared with those for non-survivors (patients who died within 5 years after surgery). Patients alive at last encounter who had a follow-up period shorter than 5 years were excluded from the study. RESULTS: The study identified 257 patients with HC who underwent curative-intent resection with an actuarial 5-year survival of 19%. Of 194 patients with a follow-up period longer than 5 years, 23 (12%) were 5-year survivors. Compared with non-survivors, the 5-year survivors had a lower median pretreatment CA 19-9 level (116 vs. 34 U/L; P = 0.008) and a lower rate of lymph node involvement (42% vs. 15%; P = 0.027) and R1 margins (39% vs. 17%; P = 0.042). However, the sole presence of these factors did not preclude a 5-year survival after surgery. The frequencies of bile duct resection alone, major hepatectomy, caudate lobe resection, portal vein or hepatic artery resection, preoperative biliary sepsis, intraoperative blood transfusion, serious postoperative complications, and receipt of adjuvant chemotherapy were comparable between the two groups. CONCLUSIONS: One in eight patients with HC reaches the 5-year survival milestone after resection. A 5-year survival can be achieved even in the presence of traditionally unfavorable clinicopathologic factors (elevated CA 19-9, nodal metastasis, and R1 margins).

Association of Perioperative Transfusion with Recurrence and Survival After Resection of Distal Cholangiocarcinoma: A 10-Institution Study from the US Extrahepatic Biliary Malignancy Consortium.

BACKGROUND: Perioperative allogeneic blood transfusion is associated with poor oncologic outcomes in multiple malignancies. The effect of blood transfusion on recurrence and survival in distal cholangiocarcinoma (DCC) is not known. METHODS: All patients with DCC who underwent curative-intent pancreaticoduodenectomy at 10 institutions from 2000 to 2015 were included. Primary outcomes were recurrence-free (RFS) and overall survival (OS). RESULTS: Among 314 patients with DCC, 191 (61%) underwent curative-intent pancreaticoduodenectomy. Fifty-three patients (28%) received perioperative blood transfusions, with a median of 2 units. There were no differences in baseline demographics or operative data between transfusion and no-transfusion groups. Compared with no-transfusion, patients who received a transfusion were more likely to have (+) margins (28 vs 14%; p = 0.034) and major complications (46 vs 16%; p < 0.001). Transfusion was associated with worse median RFS (19 vs 32 months; p = 0.006) and OS (15 vs 29 months; p = 0.003), which persisted on multivariable (MV) analysis for both RFS [hazard ratio (HR) 1.8; 95% confidence interval (CI) 1.1-3.0; p = 0.031] and OS (HR 1.9; 95% CI 1.1-3.3; p = 0.018), after controlling for portal vein resection, estimated blood loss (EBL), grade, lymphovascular invasion (LVI), and major complications. Similarly, transfusion of ≥ 2 pRBCs was associated with lower RFS (17 vs 32 months; p < 0.001) and OS (14 vs 29 months; p < 0.001), which again persisted on MV analysis for both RFS (HR 2.6; 95% CI 1.4-4.5; p = 0.001) and OS (HR 4.0; 95% CI 2.2-7.5; p < 0.001). The RFS and OS of patients transfused 1 unit was comparable to patients who were not transfused. CONCLUSION: Perioperative blood transfusion is associated with decreased RFS and OS after resection for distal cholangiocarcinoma, after accounting for known adverse pathologic factors. Volume of transfusion seems to exert an independent effect, as 1 unit was not associated with the same adverse effects as ≥ 2 units.

Melanoma.

Current recommendations by the United States Preventive Services Task Force do not support screening for skin cancer. Melanoma is unique among cancers because detection is through visual inspection. Development of technologies that aid visual inspection have supported screening strategies in high-risk populations such as older fair skinned males with personal or family history of melanoma. Clearly delineating these populations and appropriate utilization of these newer technologies will be imperative in future screening paradigms.

Cyst location and presence of high grade dysplasia or invasive cancer in intraductal papillary mucinous neoplasms of the pancreas: a seven institution study from the central pancreas consortium.

BACKGROUND: Traditionally, intraductal papillary mucinous neoplasms (IPMNs) of the pancreas with "high risk stigmata" (HRS) or "worrisome features" (WF) are referred for resection. We aim to assess if IPMN location is predictive of harboring either high grade dysplasia (HGD) or invasive cancer (IC). METHODS: Patients undergoing resection for IPMN from seven institutions between 2000 and 2015 (n = 275) were analyzed. HRS and WF were defined by the 2012 Fukuoka international consensus guidelines. RESULTS: 168 (61%) patients had head/uncinate cysts, while 107 (39%) had neck/body/tail cysts. No differences were noted between groups with regard to age, duct type, cyst size, or presence of at least one WF. Patients with cysts in the head/uncinate were more often male (55% vs. 40%), had at least one HRS (24% vs. 11%), and more often harbored HGD or IC(49% vs. 27%)[all p < 0.05]. On multivariate analysis, only cyst location in the head/uncinate remained associated with presence of HGD or IC(odds ratio 4.76, p = 0.02). DISCUSSION: Cyst location is predictive of HGD or IC in patients with IPMNs. Head/uncinated cysts are more likely to harbor malignancy compared to those of the neck/body/tail. Additional studies are needed to confirm these findings, however, cyst location should be considered part of the decision making process for surveillance vs. resection for IPMNs.