Dysregulated miRNAs modulate tumor microenvironment associated signaling networks in pancreatic ductal adenocarcinoma.

The desmoplastic and complex tumor microenvironment of pancreatic ductal adenocarcinoma (PDAC) has presented tremendous challenges for developing effective therapeutic strategies. Strategies targeting tumor stroma, albeit with great potential, have met with limited success due to the lack of knowledge on the molecular dynamics within the tumor microenvironment (TME). In pursuit of a better understanding of the influence of miRNAs on TME reprogramming and to explore circulating miRNAs as diagnostic and prognostic biomarkers for PDAC, using RNA-seq, miRNA-seq, and single-cell RNA-seq (scRNA-seq), we investigated the dysregulated signaling pathways in PDAC TME modulated by miRNAs from plasma and tumor tissue. Our bulk RNA-seq in PDAC tumor tissue identified 1445 significantly differentially expressed genes with extracellular matrix and structure organization as the top enriched pathways. Our miRNA-seq identified 322 and 49 abnormally expressed miRNAs in PDAC patient plasma and tumor tissue, respectively. We found many of the TME signaling pathways were targeted by those dysregulated miRNAs in PDAC plasma. Combined with scRNA-seq from patient PDAC tumor, our results revealed that these dysregulated miRNAs were closely associated with extracellular matrix (ECM) remodeling, cell-ECM communication, epithelial-mesenchymal transition, as well as immunosuppression orchestrated by different cellular components of TME. The findings of this study could assist the development of miRNA-based stromal targeting biomarkers or therapy for PDAC patients.

Predictors of Systolic Heart Failure and Mortality Following Orthotopic Liver Transplantation: a Single-Center Cohort.

OBJECTIVES: The purpose of this study was to identify risk factors that may predict heart failure with reduced ejection fraction (HFrEF) following orthotopic liver transplantation (OLT) and associated mortality. BACKGROUND: HFrEF following OLT is a poorly understood phenomenon, reported in 3% to 7% of transplanted patients. METHODS: This is a retrospective analysis of 176 consecutive patients who underwent OLT from 2010 to 2017. Multivariate logistic regression was used to identify associations between cardiovascular risk factors and perioperative variables with post-OLT HFrEF, defined as reduction in left ventricular ejection fraction of at least 10% and left ventricular ejection fraction less than or equal to 40% with acute heart failure symptoms. Multivariate cox proportional hazards regression (with inverse probability weighting by propensity scores) was used to evaluate effects of HFrEF on 1-year mortality. RESULTS: Of the176 patients, 14% developed HFrEF with a median of 5 days. History of heart failure (OR 10.99, 2.15-56.09; P = .04) and intraoperative transfusion of greater than 11 units of packed red blood cells (OR 3.377, 1.025-11.13; P = .045) were associated with increased incidence of HFrEF. Pre-transplant hemoglobin greater than 8.5 g/dL (OR 0.252, CI 0.0954- 0.665; P = .05) was protective against HFrEF. Thirty-three percent of HFrEF group died within 1 year (HR 7.36, 2.57-21.12; P < .001). CONCLUSIONS: The incidence of acute HFrEF post-OLT is 14% and is associated with a 7-fold increase in 1-year mortality. Cirrhotic cardiomyopathy and stress-induced cardiomyopathy maybe the underlying mechanisms. Our study identified risk factors associated with post-OLT HFrEF and should provide additional guidance for risk stratification of patients undergoing OLT.

Transplantation of hepatitis C virus (HCV) antibody positive, nucleic acid test negative donor kidneys to HCV negative patients frequently results in seroconversion but not HCV viremia.

Anecdotal reports have suggested that transplantation of hepatitis C virus (HCV) antibody positive (Ab+)/nucleic acid test negative (NAT-) donor kidneys into HCV negative recipients is not associated with HCV transmission. We reviewed our center's outcomes of 32 HCV negative patients who received kidney allografts from 25 donors who were HCV Ab+/NAT-. The mean recipient age was 56.9 ± 12.1 years and the mean donor age was 41.5 ± 14 years, with a median Kidney Donor Profile Index (KDPI) of 68%. Twelve donors (48%) met Public Health Service (PHS) increased risk status. All patients received antithymocyte globulin induction followed by tacrolimus, mycophenolate mofetil, and steroid maintenance immunosuppression. With a mean follow-up posttransplant of 10 ± 2.7 months, 1- and 3- month serum creatinine levels were 1.7 ± 0.8 and 1.3 ± 0.4, respectively, and patient and graft survival rates were 100% and 97%, respectively. Fourteen patients (44%) seroconverted and became HCV Ab+ posttransplant. However, all 32 patients were HCV RNA negative at 1- and 3- months posttransplant, and 27 and 8 patients tested at 6- and 12-months posttransplant, respectively, remain HCV RNA negative. In conclusion, transplantation of HCV Ab+/NAT- kidneys to HCV negative recipients frequently causes HCV Ab seroconversion but not HCV viremia.

Post-Transplant Diabetes Mellitus After Kidney Transplant in Hispanics and Caucasians Treated with Tacrolimus-Based Immunosuppression.

BACKGROUND Development of post-transplant diabetes mellitus after kidney transplant (PTDM) significantly increases kidney graft loss and mortality. Several risk factors for PTDM have been reported, including Hispanic ethnicity and the use of calcineurin inhibitors and corticosteroids. The incidence and impact of PTDM in the Hispanic kidney transplant population is unknown. MATERIAL AND METHODS We retrospectively reviewed the medical records of 155 Hispanic and 124 Caucasian patients, who were not diabetics and underwent kidney transplant between January 2006 and December 2011. We analyzed their clinical outcomes at 12 months post-transplant, including the incidence of PTDM, acute rejection rates, and patient and graft survival. RESULTS Hispanics who developed PTDM (n=22) were more than 10 years older and had higher body mass index (BMI) than Hispanics without PTDM (p<0.001 and p=0.001, respectively). Caucasians with PTDM (n=13) were non-significantly older (2.5 years) and had higher BMI than Caucasians without PTDM (p=0.526, p=0.043, respectively). The incidence of PTDM was not significantly different between Hispanics and Caucasians treated with tacrolimus-based immunosuppression (14.2% and 10.5%, respectively). CONCLUSIONS PTDM did not cause significant difference in short-term outcomes after kidney transplant in Hispanics or Caucasians. Larger multicenter prospective and long-term clinical trials are needed to validate these findings.

Randomized Clinical Trial Comparing Proton Beam Radiation Therapy with Transarterial Chemoembolization for Hepatocellular Carcinoma: Results of an Interim Analysis.

PURPOSE: To describe results of a planned interim analysis of a prospective, randomized clinical trial developed to compare treatment outcomes among patients with newly diagnosed hepatocellular carcinoma (HCC). METHODS AND MATERIALS: Eligible subjects had either clinical or pathologic diagnosis of HCC and met either Milan or San Francisco transplant criteria. Patients were randomly assigned to transarterial chemoembolization (TACE) or to proton beam radiation therapy. Patients randomized to TACE received at least 1 TACE with additional TACE for persistent disease. Proton beam radiation therapy was delivered to all areas of gross disease to a total dose of 70.2 Gy in 15 daily fractions over 3 weeks. The primary endpoint was progression-free survival, with secondary endpoints of overall survival, local tumor control, and treatment-related toxicities as represented by posttreatment days of hospitalization. RESULTS: At the time of this analysis 69 subjects were available for analysis. Of these, 36 were randomized to TACE and 33 to proton. Total days of hospitalization within 30 days of TACE/proton was 166 and 24 days, respectively (P<.001). Ten TACE and 12 proton patients underwent liver transplantation after treatment. Viable tumor identified in the explanted livers after TACE/proton averaged 2.4 and 0.9 cm, respectively. Pathologic complete response after TACE/proton was 10%/25% (P=.38). The 2-year overall survival for all patients was 59%, with no difference between treatment groups. Median survival time was 30 months (95% confidence interval 20.7-39.3 months). There was a trend toward improved 2-year local tumor control (88% vs 45%, P=.06) and progression-free survival (48% vs 31%, P=.06) favoring the proton beam treatment group. CONCLUSIONS: This interim analysis indicates similar overall survival rates for proton beam radiation therapy and TACE. There is a trend toward improved local tumor control and progression-free survival with proton beam. There are significantly fewer hospitalization days after proton treatment, which may indicate reduced toxicity with proton beam therapy.

Diffuse hepatic epithelioid hemangioendothelioma developed in a patient with hepatitis C cirrhosis.

Hepatic epithelioid hemangioendothelioma (HEHE) is an infrequent vascular tumor of endothelial origin that primarily occurs in women in the mid-fifth decade of life without underlying chronic liver disease or cirrhosis. Liver transplant should be the first-line of therapy in patients with large or diffuse unresectable tumors even in the presence of metastatic disease due to the favorable long-term outcome. We report the case of a 48-year-old female who complained of abdominal pain and weight loss. She has a history of cirrhosis secondary to chronic hepatitis C (HCV) and was treated with interferon and ribavirin with sustained virological response. Her work-up revealed multiple confluent infiltrating bilobar liver masses diagnosed as HEHE. She underwent a successful liver transplant without evidence of recurrent HCV infection. She developed cervical spine (C4-C6) HEHE metastases 4 years after transplant. She underwent surgical resection and local radiotherapy after resection with good clinical response. To the best of our knowledge, this is the first report of HEHE that developed in a patient with HCV cirrhosis successfully treated with antiviral therapy before transplant and liver transplant with good allograft function without evidence of recurrent liver tumor or HCV infection but developed metastases to the cervical spine 4 years after transplant.

Inhibiting systemic autophagy during interleukin 2 immunotherapy promotes long-term tumor regression.

Administration of high-dose interleukin-2 (HDIL-2) has durable antitumor effects in 5% to 10% of patients with melanoma and renal cell carcinoma. However, treatment is often limited by side effects, including reversible, multiorgan dysfunction characterized by a cytokine-induced systemic autophagic syndrome. Here, we hypothesized that the autophagy inhibitor chloroquine would enhance IL-2 immunotherapeutic efficacy and limit toxicity. In an advanced murine metastatic liver tumor model, IL-2 inhibited tumor growth in a dose-dependent fashion. These antitumor effects were significantly enhanced upon addition of chloroquine. The combination of IL-2 with chloroquine increased long-term survival, decreased toxicity associated with vascular leakage, and enhanced immune cell proliferation and infiltration in the liver and spleen. HDIL-2 alone increased serum levels of HMGB1, IFN-γ, IL-6, and IL-18 and also induced autophagy within the liver and translocation of HMGB1 from the nucleus to the cytosol in hepatocytes, effects that were inhibited by combined administration with chloroquine. In tumor cells, chloroquine increased autophagic vacuoles and LC3-II levels inhibited oxidative phosphorylation and ATP production and promoted apoptosis, which was associated with increased Annexin-V(+)/propidium iodide (PI)(-) cells, cleaved PARP, cleaved caspase-3, and cytochrome c release from mitochondria. Taken together, our findings provide a novel clinical strategy to enhance the efficacy of HDIL-2 immunotherapy for patients with cancer.

Ethical management of conflict of interest: proposed standards for academic surgical societies.

BACKGROUND: A significant increase in industry support of professional medical associations coupled with data suggesting that gifts from industry have significant clinical influence have prompted calls from the Institute of Medicine and physician leaders to identify and manage conflicts of interest that stem from financial support of professional medical associations by industry. STUDY DESIGN: A joint task force of members appointed by the Association for Academic Surgery and the Society of University Surgeons was convened in July 2009. Recommendations were developed regarding management of all potential conflicts of interest that can arise within the context of an academic surgical society, with specific focus on relationships with industry. Task force members reached consensus around each recommendation and the guidelines were subsequently adopted by the Executive Councils of both societies. RESULTS: The committee identified 4 primary areas of need for transparent and definitive management of conflict of interest: 1) individual society activities, including general budget support, society endorsements, and journal affiliation; 2) individual personnel conflicts such as society leadership and standards for disclosure of conflict; 3) meeting activities including budgetary support, program committee associations, and abstract review process; and 4) foundation support and research and travel awards. The resulting guidelines aim to protect the societies and their membership from undue bias that may undermine the credibility and mission of these associations. CONCLUSIONS: Policy guidelines to mitigate conflict of interest are necessary to protect the integrity of the work of academic surgical societies and their fiduciary duty to members and patients. Guidelines created and adopted by the Association for Academic Surgery and Society of University Surgeons form an effective model for academic surgical societies and their members.

Posttransplant biliary complications in the pre- and post-model for end-stage liver disease era.

Biliary complications remain a cause of morbidity after liver transplantation. The aim of this study was to determine whether changes in clinical practice in the era of the Model for End-Stage Liver Disease (MELD) has affected biliary complications after liver transplantation. We retrospectively reviewed all deceased donor liver transplants at a single center. Patients were categorized as pre- or post-MELD (transplant before or after February 28, 2002). A total of 1798 recipients underwent deceased donor liver transplants. Biliary stricture was more common in the post-MELD era (15.4% versus 6.4%, P < 0.001). The strongest risk factors for stricture development were donor age (odds ratio [OR] = 1.01), presence of a prior bile leak (OR = 2.24), use of choledochocholedochostomy (OR = 2.22), and the post-MELD era (OR = 2.30). Bile leak was more common in the pre-MELD era (7.5% versus 4.9%, P = 0.02), with use of a T-tube as the strongest risk factor (OR = 3.38). Surgical factors did not influence the biliary complication rate. In conclusion, even when employing multivariate analysis to allow for factors that may influence biliary strictures, transplant in the post-MELD era was an independent predictor for stricture development. Further studies are warranted to determine the etiology of this increase.

Hepatitis C recurrence is not adversely affected by the use of donation after cardiac death liver allografts.

Many factors can worsen a recurrent hepatitis C virus (HCV) infection after liver transplantation (LT). We sought to determine whether the use of donation after cardiac death (DCD) livers affects HCV recurrence. From January 2000 to June 2008, 37 HCV patients underwent LT with DCD allografts. The outcomes and severity of HCV recurrence were analyzed along with those for 74 matched control patients with HCV who received donation after brain death (DBD) livers. The 2 groups had similar donor and recipient characteristics, immunosuppression regimens, rates of acute cellular rejection (ACR), and HCV profiles. DCD patients had a higher incidence of primary nonfunction (19% versus 3%, P = 0.006) and significantly higher peak aspartate aminotransferase levels in comparison with DBD subjects, suggesting a greater degree of ischemia/reperfusion injury. Although the survival rates were not significantly different, DCD recipients had lower 1- and 5-year patient survival rates (83% and 69% versus 84% and 78%, respectively, P = 0.75) and graft survival rates (70% and 61% versus 82% and 74%, respectively, P = 0.24). Three hundred fourteen protocol and clinically indicated liver biopsy procedures were performed within 6 years after transplantation, and mixed modeling analysis showed that fibrosis progression rates were similar for the 2 groups (0.6 fibrosis units/year according to the Ishak modified staging system). The rates of severe HCV recurrence (retransplantation or death due to recurrent hepatitis C and/or the development of stage 4/6 fibrosis or worse within 2 years) were similar [3 DCD patients (8%) versus 11 DBD patients (15%), P = 0.38], and cytomegalovirus infection (hazard ratio = 7.9, P = 0.002, 95% confidence interval = 2.1-28.9) and ACR (hazard ratio = 6.2, P = 0.002, 95% confidence interval = 2.0-19.7) were the only independent risk factors for severe recurrence. In summary, although there was a trend of poorer overall outcomes in DCD patients, the use of DCD livers did not appear to adversely affect HCV recurrence after LT.

Individual and environmental correlates and predictors of early adherence and outcomes after liver transplantation.

CONTEXT: Little is known about patients' contribution to health outcomes after liver transplantation. Yet, in other transplant recipients, nonadherent behavior is directly related to the leading causes of morbidity and mortality in liver transplant recipients. OBJECTIVE: To examine patient and environmental factors in relation to all aspects of adherence to the posttransplantation regimen and health outcomes in the first 6 months after transplantation. DESIGN: A descriptive analysis of individual and environmental factors in relation to adherence and health outcomes at 6 months after liver transplantation. PARTICIPANTS, SETTING: One hundred fifty-two adult liver transplant recipients at the University of Pittsburgh Medical Center. MAIN OUTCOME MEASURES: Adherence to medication taking, appointment keeping, lifestyle changes, mood, quality of life, and clinical markers of liver function. RESULTS: Nonadherence was prevalent (47% with appointments, 73% with medication); relapse to drug/alcohol use occurred among a few recipients (5.6%), all with a history of substance abuse before transplantation. Patterns of coping, decision making, attitude, and social support were correlated with adherence, clinical markers, and psychological function (r = 0.22-0.45). Avoidant coping, affective dysregulation, and caregiver support emerged as robust predictors of negative clinical and mental health outcomes (beta = .224-.363). CONCLUSION: This information about liver transplant recipients is important for researchers and clinicians. Researchers can develop guidelines by using stable but modifiable characteristics of patients to identify transplant candidates at risk of nonadherence. Such guidelines would enable clinicians to prepare patients better to manage the posttransplant regimen.

Treatment of hepatic epithelioid hemangioendothelioma: a single-institution experience with 25 cases.

OBJECTIVE: To examine treatment of hepatic epithelioid hemangioendothelioma (EHE), a rare vascular tumor with a variable course. Treatment modalities at our institution include liver resection, transplantation, and catheter-based therapies. DESIGN, PATIENTS, AND MAIN OUTCOME MEASURES: Retrospective review of 25 patients treated for hepatic EHE (1976-2007). We examined treatment modality, overall survival, complications, and clinicopathologic characteristics. RESULTS: Of the 25 patients treated for hepatic EHE, 17 underwent liver transplantation (LT); 4, transcatheter arterial chemoembolization (TACE); 2, resection; and 2, TACE followed by LT. Twelve patients (48%) were male. The median age at diagnosis was 38 years (range, 9 months to 72 years). Mean overall survival was 167 (95% confidence interval [CI], 123-212) months, with 172 (124-220) months in the LT group and 83 (54-112) months in the TACE group. The 2 patients in the resection group remain alive after 19 and 71 months. The 2 patients treated with TACE followed by LT died after 13 and 113 months. Extrahepatic disease was identified as a predictor of outcome. Patients with extrahepatic disease treated with TACE fared better than those treated with surgical approaches (mean survival, 83.0 [95% CI, 54.2-111.8] vs 38.8 [23.7-53.8] months; P = .12). CONCLUSIONS: Hepatic EHE is a rare tumor that can be treated with surgical or nonsurgical approaches. In our experience, LT is used for patients with advanced local disease, whereas TACE is the primary modality when extrahepatic disease or comorbid conditions prohibiting LT are present. To our knowledge, this is the largest single-institution experience describing the various therapeutic modalities in the treatment of hepatic EHE.

Ethyl pyruvate administration inhibits hepatic tumor growth.

EP is a potent inhibitor of HMGB1 release that has significant anti-inflammatory activities and exerts a protective effect in animal models of inflammation. As inflammation is linked to cancer growth, we hypothesized that EP would have anti-tumor activity and explored its effects in a liver tumor model. Mice injected intraportally with MC38 colorectal cancer cells led to the growth of visible hepatic tumors within 2 weeks. Pretreatment with EP 30 min prior to infusion of tumor cells and continuing daily for 9 days inhibited tumor growth significantly in a dose-dependent manner, with 80 mg/kg EP achieving >70% reduction in the number of tumor nodules when compared with untreated animals. Delayed treatment with EP also suppressed tumor growth significantly, although to a lesser extent. Tumors had early, marked leukocytic infiltrates, and EP administration decreased innate (NK cells, monocytes) and adaptive (T and B cell lymphocytic) immune cell infiltrates acutely and significantly in the liver. Serum IL-6 and HMGB1 levels, which were elevated following tumor injection, were decreased significantly in EP-treated animals. Tumors showed an increase in apoptosis in EP treated mice, and tumor cells treated in vitro with EP had marked increases in LC3-II and cleaved PARP, consistent with enhanced autophagic flux and apoptosis. Thus, EP inhibition of tumor growth in the liver was mediated by tumor (induction of apoptosis) and host (decreased inflammation) effects. EP administration may have a therapeutic role in the treatment of cancer in conjunction with other therapeutic agents.

Simultaneous pancreatectomy and liver transplantation: a single-institution experience.

BACKGROUND: There is wide debate among transplant centres regarding the indications for liver transplantation (LT) in malignancy. We report a single-centre experience with simultaneous LT and total pancreatectomy or pancreaticoduodenectomy. METHODS: We performed a retrospective review of a prospectively established database of patients who underwent simultaneous LT and total pancreatectomy or pancreaticoduodenectomy. We analysed demographics, indications, approach and outcomes. RESULTS: Between 1991 and 2006, 11 patients (four male; median age 51 years) underwent simultaneous LT and total pancreatectomy (n = 4) or pancreaticoduodenectomy (n = 7). Indications included metastatic neuroendocrine tumour (n = 5), hepatocellular carcinoma (n = 2), metastatic periampullary adenocarcinoma (n = 1), periampullary adenocarcinoma with end-stage liver disease (ESLD) (n = 2) and intraductal papillary mucinous neoplasm with ESLD (n = 1). The three patients with ESLD had non-alcoholic steatohepatitis, primary sclerosing cholangitis or cryptogenic cirrhosis. Median postoperative length of stay was 31 days (21-110 days). Overall median survival was 101 months (95% confidence interval 70.6-131.4). One-year survival was 91%, 2-year 90%, 5-year 67% and 10-year 33%. Postoperative complications included: re-operation (n = 4); anastamotic leak (n = 2); abdominal abscess (n = 3), and organ rejection (n = 1). CONCLUSIONS: We report a series of pancreatectomy or pancreaticoduodenectomy and simultaneous LT in patients with extensive malignancy or impending liver failure that prevented pancreatectomy. This series provides evidence that combined pancreatic resection and LT can be a strategy in both radical resections and cases with ESLD that would otherwise preclude operative intervention.

Liver transplantation in patients with nonalcoholic steatohepatitis-related hepatocellular carcinoma.

BACKGROUND & AIMS: The increasing incidence of hepatocellular carcinoma in the United States is only partially accounted for by hepatitis C virus (HCV) infections. The prevalence of hepatocellular carcinoma in patients with nonalcoholic steatohepatitis (NASH) is not known; guidelines from the American Association for the Study of Liver Diseases do not recommend surveillance imaging. We sought to determine the prevalence of hepatocellular carcinoma among patients undergoing liver transplantation for NASH-related cirrhosis and their outcome after surgery, compared with controls. METHODS: We reviewed the records of adult patients with NASH cirrhosis who underwent liver transplantation by using a prospectively collected database from a single center. Data from patients with NASH cirrhosis were compared with matched controls who received transplantation for primary biliary cirrhosis/primary sclerosing cholangitis, alcoholic liver disease, or HCV. RESULTS: Seventeen of 98 patients (17%) with NASH cirrhosis were diagnosed with hepatocellular carcinoma. The mean age was 63 years, and 70% were male. Six patients were diagnosed with hepatocellular carcinoma incidentally on explant. Survival after liver transplantation was 88% after mean follow-up of 2.5 years. The number of NASH patients known to have hepatocellular carcinoma before liver transplantation was greater than the number of patients with primary biliary cirrhosis/primary sclerosing cholangitis and comparable to the number of patients with alcoholic liver disease and HCV. CONCLUSIONS: Patients with NASH cirrhosis are at risk for developing hepatocellular carcinoma; patients with NASH cirrhosis, especially men older than 50 years, should undergo surveillance imaging. Patients with NASH and hepatocellular carcinoma have good outcomes after liver transplantation.

Initial experience using continuous intravenous treprostinil to manage pulmonary arterial hypertension in patients with end-stage liver disease.

Treprostinil is a prostacyclin analog and has been used on idiopathic pulmonary arterial hypertension (PAH). There is only limited clinical experience using treprostinil to manage PAH in patients with end-stage liver disease (ESLD). We report three ESLD patients with PAH, who were treated with continuous intravenous treprostinil. A 59-year-old woman with ESLD secondary to alcoholic hepatitis had portopulmonary hypertension with mean pulmonary arterial pressure (mPAP) of 44 mmHg and transpulmonary gradient (TPG) of 23 mmHg. Treprostinil at 45 ng/kg/min for 6 months decreased mPAP to 23 (TPG to 8). A 53-year-old man had ESLD secondary to alcoholic hepatitis with PAH caused by multiple pulmonary embolisms (mPAP of 32 and TPG of 23). Treprostinil at 36 ng/kg/min for 3 months decreased mPAP to 23 and TPG to 14. Both patients underwent uneventful liver transplantation. A 48-year-old man had ESLD secondary to hepatitis C and portopulmonary hypertension with mPAP of 60 and TPG of 44. Two years after intravenous treprostinil at 106 ng/kg/min, his mPAP decreased to 44 and TPG to 30. These results demonstrate that for a selected group of ESLD patients with PAH, a continuous intravenous infusion of treprostinil appears to be safe and effective.

Liver biopsy findings from healthy potential living liver donors: reasons for disqualification, silent diseases and correlation with liver injury tests.

BACKGROUND/AIMS: Liver biopsies detect silent donor disease in potential living liver donors and provide material for studies of subclinical non-alcoholic fatty liver disease (NAFLD). Our primary goal was to determine the contribution of biopsy findings to potential donor evaluation. Factors contributing to pre-clinical NAFLD and correlations between liver injury tests and histopathology have been also determined. METHODS: Patient records, laboratory tests and results of the histopathologic examination and diagnoses of 284 patients from 2001 to 2005 were retrospectively extracted from the EDIT database. Hepatic histology was correlated with liver injury tests and with general demographic characteristics in an otherwise normal healthy population. RESULTS: A minority (n=119; 42%) of biopsies from this population of 143 males/141 females (average age=36.8years; mean BMI=26.6) were completely normal. The remainder showed steatosis (n=107; 37%), steatohepatitis (n=44; 15%), or unexplained low-grade/early stage chronic hepatitis, primary biliary cirrhosis, or nodular regenerative hyperplasia (n=16; 6%). Biopsy findings disqualified 29/56 donors. Independent risk factors for NAFLD by multivariate modeling, which differed by sex, included: BMI (p=0.0001), age (p=0.003), iron (p=0.01), and ALT (p=0.004). CONCLUSIONS: Liver biopsies provide valuable information about otherwise undetectable liver disease in potential liver donors. Obesity, age and iron, which are influenced by sex, contribute to NAFLD pathogenesis. Blood tests other than standard liver profiles are needed to detect early NAFLD.

The biology of interleukin-2 efficacy in the treatment of patients with renal cell carcinoma.

Renal cell carcinoma (RCC) is the eighth most common malignancy in adults in the United States. More than 50% of individuals present with metastatic disease and conventional chemotherapeutic strategies have been associated with poor response rates. Immunotherapy with Interleukin (IL)-2, however, induces durable remission, achieving >10 year recurrence free survival in 5-10% of patients with advanced RCC. First described as a T cell growth factor, IL-2 has a wide spectrum of effects in the immune system. Some of the possible mechanisms by which IL-2 carries out its anticancer effects include the augmentation of cytotoxic immune cell functions and reversal of T cell anergy, enabling delivery of immune cells and possibly serum components into tumor. IL-2 indirectly limits tumor escape mechanisms such as defective tumor cell expression of Class I or Class II molecules or expansion of regulatory T cells. Indirect effects on the tumor microenvironment are also likely and associated with rather dramatic T cell infiltration during the global delayed type hypersensitivity response that is associated with systemic IL-2 administration. The IL-2 signaling pathway, its effects on immune cells, and its role in various independent mechanisms of tumor surveillance likely play a role but little substantive data defining a clear phenotype or genotype of IL-2 responders distinguishing them from nonresponders has emerged in the last 25 years since IL-2 therapy was initiated. At best, we can only speculate that the disturbed homeostatic host/tumor interaction is reset in a small subset of patients allowing an antitumor response to recover or ensue.

Pharmacologic administration of interleukin-2.

The development of biologic therapies for patients with cancer has in part been impeded by the extraordinary complexity and intrinsic feedback mechanisms promoting homeostasis in tissue injury, repair, inflammation, and immunity. Recombinant interleukin 2 (IL-2) therapy was initiated in 1984 based on its role as the prototypic T-cell growth factor, with novel roles deduced late after its FDA approval in regulating not only effector T cells but also regulatory T cells. Complicating its application, even in the most sophisticated centers, has been the manageable but difficult toxicities attendant on its use in spite of clear evidence of complete responses in 5-10% of treated patients with melanoma and renal cell carcinoma with extraordinary durability lasting now for almost 25 years, thus tantamount to "cures." Although efforts have been made to diminish toxicity or enhance efficacy the only substantive advance in combination therapy has been the application of tumor-infiltrating lymphocytes and the antibody to CTLA4. A deeper understanding of the "limiting" toxicity associated with mild flu-like symptoms and more debilitating cytokine "storm" not forthcoming. Here we propose the notion that the systemic syndrome associated with IL-2 administration is due to global cytokine-induced autophagy and temporally limited tissue dysfunction. The possible role of autophagy inhibitors to enhance efficacy and limit toxicity as well as possible problems with this approach are considered.