Injectable thermosensitive hydrogel to modulate tolerogenic dendritic cells under hyperglycemic condition

Hyperglycemia associated with diabetes mellitus is a significant risk factor for periodontitis and it polarizes the immune cells towards an inflammatory state. Specific biomaterials can deliver therapeutic or immunomodulatory agents to regulate the excessive periodontal inflammation. Dendritic cells (DCs) bridge the innate and adaptive immune systems and are crucially involved in periodontitis. Thus, targeting DCs is an attractive treatment option for diabetic periodontitis, which, by modulating the downstream adaptive immune cells could regulate the host immune responses. In this study, a chitosan-based thermosensitive injectable self-assembled hydrogel (TISH) was developed to modulate DCs towards a tolerogenic phenotype, which can induce regulatory T-cells to attenuate inflammation and promote healing. Granulocyte-macrophage colony-stimulating factor (GM-CSF) and resveratrol were loaded into TISH (TISH(G + R)) and were sustainably released. TISH demonstrated good biocompatibility and cell penetration in its porous structure. DCs grown in TISH(G + R) under an in vitro hyperglycemic condition showed reduced maturation and activation markers such as CD80, CD83 and CD86, while simultaneously upregulated tolerogenic genes such as FOXP3, SOCS3, TGFß and IL10. Co-culture of these tolerogenic DCs with naïve T-cells induced regulatory T-cells differentiation, evidenced by elevated gene expressions of FOXP3, TGFβ and IL-10. In vivo subcutaneous injection of TISH (G + R) into the mice showed significant infiltration of DCs and regulatory T-cells. In conclusion, TISH was developed and optimized as an injectable hydrogel to modulate DCs towards the tolerogenic phenotype and induce regulatory T-cells under hyperglycemia. TISH has promising potential to improve periodontal parameters in diabetic periodontitis.

Heterogeneous vs homogenous photocatalysis: what dominates in the degradation of methyl orange and methylene blue mixtures?

Photocatalysis has been oft proposed as a green solution for pollution remediation, however, majority of the existing literature only studies the degradation of solitary analytes. The degradation of mixtures of organic contaminants is inherently more complicated due to a variety of photochemical processes that occur in parallel. Here, we describe a model system comprised of methylene blue and methyl orange dyes whose degradation carried out by two common photocatalysts, P25 TiO₂ and g-C₃N₄. With P25 TiO₂ as the catalyst, the degradation rate of methyl orange slowed by 50% when degraded in a mixture compared to when alone. Control experiments with radical scavengers showed this to occur due to competition between the dyes for oxidative photogenerated species. In the presence of g-C₃N₄, methyl orange's degradation rate in the mixture increased by 2300% due to two homogeneous photocatalysis processes sensitized by methylene blue. Homogenous photocatalysis was found to be fast relative to heterogeneous photocatalysis by g-C₃N₄ but slow relative to photocatalysis by P25 TiO₂ and explains the change observed between the two catalysts. Changes in dye adsorption to the catalyst when in a mixture were also explored but not found to coincide with changes in degradation rate.

PDMS hydrogel-coated tissue culture plates for studying the impact of substrate stiffness on dendritic cell function

The mechanical properties of polydimethylsiloxane hydrogels can be tuned to mimic physiological tensions, an underappreciated environmental parameter in immunology studies. We describe a workflow to prepare PDMS-coated tissue culture plates with biologically relevant substrate stiffness, and the use of these hydrogel plates to condition isolated primary splenic CD11c+ dendritic cells (DC). Finally, we suggest downstream applications to study the impact of substrate stiffness on DC function and metabolism. The protocol could be adapted to study other mechanosensitive immune cell subsets.

For complete details on the use and execution of this protocol, please refer to Chakraborty et al. (2021).

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A protocol for using PDMS hydrogel plates to study mechanosensing in immune cells

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Workflow for preparing and validating PDMS hydrogel-coated culture plates

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Isolation and culture of tissue CD11c+ DCs for metabolic and functional analysis

Cross Country Comparison of Expert Assessments of the Quality of Death and Dying 2021

CONTEXT

Few efforts have attempted to quantify how well countries deliver end-of-life (EOL) care.

OBJECTIVES

To score, grade, and rank countries (and Hong Kong and Taiwan) on the quality of EOL care based on assessments from country experts using a novel preference-based scoring algorithm.

METHODS

We fielded a survey to country experts around the world, asking them to assess the performance of their country on 13 key indicators of EOL care. Results were combined with preference weights from caregiver-proxies of recently deceased patients to generate a preference-weighted summary score. The scores were then converted to grades (from A-F) and a ranking was created for all included countries.

RESULTS

The final sample included responses from 181 experts representing 81 countries with 2 or more experts reporting. The 6 countries who received the highest assessment scores and a grade of A were United Kingdom, Ireland, Taiwan, Australia, Republic of Korea, and Costa Rica. Only Costa Rica (upper middle) is not a high income country. Not until Uganda (ranked 31st) does a low-income country appear on the ranking. Based on the assessment scores, twenty-one countries received a failing grade, with only two - Czech Republic (66th), and Portugal (75th) - being high income countries.

CONCLUSION

This study provides an example of how a preference-based scoring algorithm and input from key stakeholders can be used to assess EOL health system performance. Results highlight the large disparities in assessments of the quality of EOL care across countries, and especially between the highest income countries and others.

Painting and Poetry From a Bereaved Family and the Caring Physician

This is a case description and personal account shared by a palliative care physician whose team provided specialist palliative care support to a patient who attempted immolation. This case depicts a family at risk of complicated grief due to the violent nature of self-inflicted burns and the lingering social stigmatization of suicide. Here, we explore important psycho-emotional considerations and share our experience using art and poetry to build therapeutic connections with the grieving family.

Preparedness to Face the COVID-19 Pandemic in Hospice and Palliative Care Services in the Asia-Pacific Region: A Rapid Online Survey

BACKGROUND

Hospice and palliative care services provision for COVID-19 patients is crucial to improve their life quality. There is limited evidence on COVID-19 preparedness of such services in the Asia-Pacific region.

AIM

To evaluate the preparedness and capacity of hospice and palliative care services in the Asia-Pacific region to respond to the COVID-19 pandemic.

METHOD

An online cross-sectional survey was developed based on methodology guidance. Asia-Pacific Hospice and Palliative Care Network subscribers (n = 1551) and organizational members (n = 185) were emailed. Descriptive analysis was undertaken.

RESULTS

Ninety-seven respondents completed the survey. Around half of services were hospital-based (n = 47, 48%), and public-funded (n = 46, 47%). Half of services reported to have confirmed cases (n = 47, 49%) and the majority of the confirmed cases were patients (n = 28, 61%). Staff perceived moderate risk of being infected by COVID-19 (median: 7/10). > 85% of respondents reported they had up-to-date contact list for staff and patients, one-third revealed challenges to keep record of relatives who visited the services (n = 30, 31%), and of patients visited in communities (n = 29, 30%). Majority of services (60%) obtained adequate resources for infection control except face mask. More than half had no guidance on Do Not Resuscitate orders (n = 59, 66%) or on bereavement care for family members (n = 44, 51%).

CONCLUSION

Recommendations to strengthen the preparedness of palliative care services include: 1) improving the access to face mask; 2) acquiring stress management protocols for staff when unavailable; 3) reinforcing the contact tracing system for relatives and visits in the community and 4) developing guidance on patient and family care during patient's dying trajectory.

Glucose oxidase kinetics using MnO2 nanosheets: confirming Michaelis-Menten kinetics and quantifying decreasing enzyme performance with increasing buffer concentration

MnO₂ nanosheets and ultraviolet-visible (UV-Vis) absorbance spectroscopy are used to study glucose oxidase (GOx) kinetics. Glucose oxidation by GOx produces H₂O₂, which rapidly decomposes the nanosheets and reduces their absorption. This direct approach for monitoring glucose oxidation enables simpler, real time kinetics analysis compared to methods that employ additional enzymes. Using this approach, the present study confirms that GOx kinetics is consistent with the Michaelis-Menten (MM) model, and reveals that the MM constant increases by an order of magnitude with increasing buffer concentration. Since larger MM constants imply higher enzyme substrate concentrations are required to achieve the same rate of product formation, increasing MM constants imply decreasing enzyme performance. These results demonstrate the facility of using MnO₂ nanosheets to study GOx kinetics and, given the widespread applications of enzymes with buffers, the important sensitivity of enzyme-buffer systems on buffer concentration.

Biomaterial Properties Modulating Bone Regeneration

Biomaterial scaffolds have been gaining momentum in the past several decades for their potential applications in the area of tissue engineering. They function as three-dimensional porous constructs to temporarily support the attachment of cells, subsequently influencing cell behaviors such as proliferation and differentiation to repair or regenerate defective tissues. In addition, scaffolds can also serve as delivery vehicles to achieve sustained release of encapsulated growth factors or therapeutic agents to further modulate the regeneration process. Given the limitations of current bone grafts used clinically in bone repair, alternatives such as biomaterial scaffolds have emerged as potential bone graft substitutes. This review summarizes how physicochemical properties of biomaterial scaffolds can influence cell behavior and its downstream effect, particularly in its application to bone regeneration.

Mechanical Stiffness Controls Dendritic Cell Metabolism and Function

Stiffness in the tissue microenvironment changes in most diseases and immunological conditions, but its direct influence on the immune system is poorly understood. Here, we show that static tension impacts immune cell function, maturation, and metabolism. Bone-marrow-derived and/or splenic dendritic cells (DCs) grown in vitro at physiological resting stiffness have reduced proliferation, activation, and cytokine production compared with cells grown under higher stiffness, mimicking fibro-inflammatory disease. Consistently, DCs grown under higher stiffness show increased activation and flux of major glucose metabolic pathways. In DC models of autoimmune diabetes and tumor immunotherapy, tension primes DCs to elicit an adaptive immune response. Mechanistic workup identifies the Hippo-signaling molecule, TAZ, as well as Ca²⁺-related ion channels, including potentially PIEZO1, as important effectors impacting DC metabolism and function under tension. Tension also directs the phenotypes of monocyte-derived DCs in humans. Thus, mechanical stiffness is a critical environmental cue of DCs and innate immunity.

Redefining Palliative Care-A New Consensus-Based Definition

CONTEXT

The International Association for Hospice and Palliative Care developed a consensus-based definition of palliative care (PC) that focuses on the relief of serious health-related suffering, a concept put forward by the Lancet Commission Global Access to Palliative Care and Pain Relief.

OBJECTIVE

The main objective of this article is to present the research behind the new definition.

METHODS

The three-phased consensus process involved health care workers from countries in all income levels. In Phase 1, 38 PC experts evaluated the components of the World Health Organization definition and suggested new/revised ones. In Phase 2, 412 International Association for Hospice and Palliative Care members in 88 countries expressed their level of agreement with the suggested components. In Phase 3, using results from Phase 2, the expert panel developed the definition.

RESULTS

The consensus-based definition is as follows: Palliative care is the active holistic care of individuals across all ages with serious health-related suffering due to severe illness and especially of those near the end of life. It aims to improve the quality of life of patients, their families and their caregivers. The definition includes a number of bullet points with additional details as well as recommendations for governments to reduce barriers to PC.

CONCLUSION

Participants had significantly different perceptions and interpretations of PC. The greatest challenge faced by the core group was trying to find a middle ground between those who think that PC is the relief of all suffering and those who believe that PC describes the care of those with a very limited remaining life span.

Perioperative intravenous contrast administration and the incidence of acute kidney injury after major gastrointestinal surgery: prospective, multicentre cohort study

BACKGROUND

This study aimed to determine the impact of preoperative exposure to intravenous contrast for CT and the risk of developing postoperative acute kidney injury (AKI) in patients undergoing major gastrointestinal surgery.

METHODS

This prospective, multicentre cohort study included adults undergoing gastrointestinal resection, stoma reversal or liver resection. Both elective and emergency procedures were included. Preoperative exposure to intravenous contrast was defined as exposure to contrast administered for the purposes of CT up to 7 days before surgery. The primary endpoint was the rate of AKI within 7 days. Propensity score-matched models were adjusted for patient, disease and operative variables. In a sensitivity analysis, a propensity score-matched model explored the association between preoperative exposure to contrast and AKI in the first 48 h after surgery.

RESULTS

A total of 5378 patients were included across 173 centres. Overall, 1249 patients (23·2 per cent) received intravenous contrast. The overall rate of AKI within 7 days of surgery was 13·4 per cent (718 of 5378). In the propensity score-matched model, preoperative exposure to contrast was not associated with AKI within 7 days (odds ratio (OR) 0·95, 95 per cent c.i. 0·73 to 1·21; P = 0·669). The sensitivity analysis showed no association between preoperative contrast administration and AKI within 48 h after operation (OR 1·09, 0·84 to 1·41; P = 0·498).

CONCLUSION

There was no association between preoperative intravenous contrast administered for CT up to 7 days before surgery and postoperative AKI. Risk of contrast-induced nephropathy should not be used as a reason to avoid contrast-enhanced CT.

The role of palliative medicine in ICU bed allocation in COVID-19: a joint position statement of the Singapore Hospice Council and the Chapter of Palliative Medicine Physicians

Facing the possibility of a surge of COVID-19-infected patients requiring ventilatory support in Intensive Care Units (ICU), the Singapore Hospice Council and the Chapter of Palliative Medicine Physicians forward its position on the guiding principles that ought to drive the allocation of ICU beds and its role in care of these patients and their families.

Dedifferentiated endometrioid adenocarcinoma of the uterus: A case series and review of literature

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Dedifferentiated endometrioid adenocarcinoma is a rare aggressive subtype of endometrial cancer.

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Patients tend to present at a later stage and have early recurrences.

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Proportion of DEAC in endometrial cancer may affect outcome.

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Further research should focus on PD-L1 expression and the use immunotherapy.

Introduction Dedifferentiated endometrioid adenocarcinoma (DEAC) was first described in 2007. However, it has only been recognised as a distinct subtype of endometrioid adenocarcinoma in the last 1–2 years. DEAC is a more aggressive histological subtype and carries a poorer prognosis. Patients with DEAC tend to present with advanced disease compared the other endometrioid adenocarcinomas. Methodology The study is a retrospective review of patients with DEAC diagnosed in two institutions in Singapore between January 2012 and October 2017. Results 7 patients were diagnosed with DEAC. The mean age was 56.4 years. All patients presented with either abnormal uterine bleeding or post menopausal bleeding. Out of the 7 patients, one was diagnosed with Stage 2 disease, 5 were diagnosed with Stage 3 disease and 1 was diagnosed with Stage 4 disease. One patient had neoadjuvant chemotherapy, followed by surgery, and completion chemotherapy post surgery. The other 6 patients (87.5%) underwent primary debulking surgery. Out of these 6 patients, 5 patients had adjuvant chemotherapy post surgery and one patient had both adjuvant chemotherapy and radiotherapy. Lymphovascular invasion was found in 71.4% of the cases. Conclusion DEAC is a more aggressive histological subtype of endometrioid adenocarcinomas. Better awareness of this condition can lead to proper diagnosis and treatment.

A Further Test of the Impact of Online Gaming on Psychological Wellbeing and the Role of Play Motivations and Problematic Use

The impact of increased online gaming play time on psychological wellbeing was examined focusing on the Multiplayer Online Battle Arena (MOBA) game genre. This relationship was explored with respect to motivators for playing and resilience factors. A cross-sectional, online questionnaire design was employed with participants (N = 165) to examine the relationship between weekly average hours played and psychological wellbeing. Five previously reported motivators for playing were tested as mediating variables. In addition, exploratory analyses were conducted to determine the moderating effects of self-esteem and self-efficacy on 'escapist' gaming and psychological wellbeing. Results revealed a significant correlation with higher levels of play time associated with poorer psychological wellbeing. This relationship was partially mediated by 'escapist' motivation. Self-esteem was found to moderate the negative impact of 'escapist' gaming on psychological wellbeing. Research and the associated clinical implications are discussed.

Developing Palliative Care in Low-Resource Countries in Asia

Background and context: According to the World Health Organization (WHO) global atlas which maps palliative care needs worldwide, just over 50% of the palliative care needs reside in Asia. Development of palliative care services in Asia is patchy, with a few high income countries, such as Singapore and Japan, with palliative care services integrated into the health system. In the vast majority of countries, particularly low-income and middle-income countries (LMICs), such services are lacking or only available in a few centers. Aim: To develop palliative care services in countries with no services. Strategy/Tactics: The Asia Pacific Hospice Palliative Care Network (APHN) is a nongovernmental organization which supports the development of palliative care in the Asia Pacific region. Since 2012 , it has developed a comprehensive program to build capacity for palliative care in several countries in the region, including Myanmar, Sri Lanka and Bangladesh. Program/Policy process: Coconceptualized and funded by the Lien Foundation, the APHN sends interdisciplinary teams of volunteer faculty to these countries to run a training of trainers program over a period of three years. Major tertiary institutions were chosen as partners, with the understanding that palliative care services would be set up once a team had been trained. An interdisciplinary team of doctors, nurses, social workers and pharmacists from each institution went through the training program together. Individuals with potential to become champions for palliative care in these countries were given further training through a clinical fellowship program at established institutions in the region. During the training participants would be expected to start palliative care services in their institutions, which will become training centers for palliative care in the future. Concomitantly, a program of advocacy for medications essential for palliative care, such as oral morphine, was also undertaken. Outcomes: Six modules of the training course were completed in each of the three countries. A corps of 20 to 30 master trainers completed the training. In each of those countries, one or more palliative care services were started in major tertiary teaching hospitals. Oral morphine availability was greatly enhanced. The master trainers organized training within their hospitals, and also for the public. Other outcomes include the recognition of palliative care as a specialty, the introduction of palliative care into undergraduate medical and nursing curricula, and development of postgraduate courses in palliative care. What was learned: It was important to target institutions which were willing establish palliative care services. An interdisciplinary group of faculty was able to teach and inspire the trainees to take up the discipline. A drug availability program was essential to provide the tools to work with.

Ensuring and Restoring Balance on Access to Controlled Substances for Medical and Scientific Purposes: Joint Statement from Palliative Care Organizations

The central principle of "balance" represents the dual obligation of governments to establish a system of control that ensures the adequate availability of controlled substances for medical and scientific purposes while simultaneously preventing their nonmedical use, diversion, and trafficking, two primary goals of the international control system. On the one hand, although strong opioids, including morphine, are absolutely necessary for the relief of severe pain, legitimate access to opioids for pain treatment and palliative care is lacking in the majority of the world's countries. On the other hand, in a few high-income countries with higher consumption of prescription opioids, diversion and nonmedical use are increasingly prevalent. This report presents examples of unbalanced systems and a joint statement from global and regional palliative care organizations to promote development of balanced systems for optimal public health outcomes. Although nonmedical use of controlled substances poses a risk to society, the system of control is not intended to be a barrier to their availability for medical and scientific purposes, nor to interfere in their legitimate medical use for patient care. As representatives of palliative care organizations, we urge heads of state to act and to take measures to ensure and restore balanced systems in their countries and call on public health leaders and regulators to work together.

Post-reconstruction dermatitis of the breast

BACKGROUND

Approximately one-third of women diagnosed with breast cancer undergo mastectomy with subsequent implant-based or autogenous tissue-based reconstruction. Potential complications include infection, capsular contracture, and leak or rupture of implants with necessity for explantation. Skin rashes are infrequently described complications of patients who undergo mastectomy with or without reconstruction.

METHODS

A retrospective analysis of breast cancer patients referred to the Dermatology Service for diagnosis and management of a rash post-mastectomy and expander or implant placement or transverse rectus abdominis myocutaneous (TRAM) flap reconstruction was performed. Parameters studied included reconstruction types, time to onset, clinical presentation, associated symptoms, results of microbiologic studies, management, and outcome.

RESULTS

We describe 21 patients who developed a rash on the skin overlying a breast reconstruction. Average time to onset was 25.7 months after expander placement or TRAM flap reconstruction. Clinical presentations included macules and papules or scaly, erythematous patches and plaques. Five patients had cultures of the rash, which were all negative. Skin biopsy was relatively contraindicated in areas of skin tension, and was reserved for non-responding eruptions. Treatments included topical corticosteroids and topical antibiotics, which resulted in complete or partial responses in all patients with documented follow-ups.

CONCLUSION

Our findings suggest that tension and post-surgical factors play a causal role in this hitherto undescribed entity: "post-reconstruction dermatitis of the breast." This is a manageable condition that develops weeks to years following breast reconstruction. Topical corticosteroids and antibiotics result in restoration of skin barrier integrity and decreased secondary infection.

Controlled hierarchical assembly of gold nanoparticles in macroscopic films: from densely packed monolayers to networks of micropores and nanobundles

The present study demonstrates the ability of excess, weakly amphiphilic n-alkanethiols (n = 4, 12, 18) and solvent composition to tune through a wide range of large-scale, macroscopic architectures formed by alkanethiol-capped Au nanoparticles (NPs). Both the alkanethiols and NPs are significantly hydrophobic species and compete for surface area at an air-water interface. When solutions of the two species are spread on a large (50 cm²) water surface in a Teflon well, a thin film forms and exhibits co-existing macroscopic regions with various distinct NP self-assembled architectures, namely a close packed monolayer, a network phase characterized by micron-sized pores (micropores) surrounded by quasi-linear bundles of nanoparticles, and finally aggregates. We hypothesize that the co-existence of various NP architectures results from fast, non-uniform evaporation across the large water surface. When solutions are instead deposited on a smaller (5 cm²) water surface contained within a Teflon ring to control the water surface curvature and the evaporation rate is slowed, we show for the first time that NPs form macroscopically uniform self-assemblies whose architectures can be tuned from monolayers → monolayers with micropores → extended micropore/NP bundle networks by varying excess alkanethiol concentration and solvent composition. We propose that competition between NPs and excess alkanethiols for water surface area, and alkanethiol self-assembly as well as solvent dewetting play important roles in the formation of the network phase, and discuss a potential mechanism for its formation.

Paediatric palliative care in the Asia Pacific region: where are we now?

Paediatric palliative care services have increased both in numbers and capacity around the world in response to the needs of children living with life-limiting conditions. Members of the Asia Pacific Hospice Network, who render care to children, have increasingly realised the need to map existing services for enhanced collaborative, educational and advocacy efforts. An online survey was conducted over 2 months among professionals in the region to document current service provision, and at the same time to explore individual training needs and practice challenges. A questionnaire crafted through consensus by members of a new special interest group within the network was used to collect data. 59 distinct responses from 16 countries were obtained to build a directory, which has already been circulated. Content analyses of narrative responses yield further findings. Half of these services catered to adults as well as to children. Staffing and service provision varied across the region but most members worked in teams consisting of multidisciplinary professionals. Numerous service and funding models were found, reflecting wide differences in local conditions and responses to diverse patient populations unique to paediatric palliative care. The highest training needs centred around bereavement and spiritual care. Capacity and funding issues were expected, but significant lack of support by paediatricians was found to be alarming and warrants further study. Amid the heterogeneity, these services share common struggles and face similar needs. Identifying individual profiles of different services potentially helps to draw everyone together, towards a common vision, and towards creating opportunities for sharing of expertise and experience.

Palliative care development in the Asia-Pacific region: an international survey from the Asia Pacific Hospice Palliative Care Network (APHN)

BACKGROUND

Although palliative care is an important public healthcare issue worldwide, the current situation in the Asia-Pacific region has not been systematically evaluated.

OBJECTIVES

This survey aimed to clarify the current status of palliative care in the Asia-Pacific region.

METHODS

Questionnaires were sent to a representative physician of each member country/region of the Asia Pacific Hospice Palliative Care Network (APHN). The questionnaire examined palliative care service provision, information regarding physician certification in palliative care, the availability of essential drugs for palliative care listed by the International Association for Hospice and Palliative Care (IAHPC) and the regulation of opioid-prescribing practice.

RESULTS

Of the 14 member countries/regions of the APHN, 12 (86%) responded. Some form of specialist palliative care services had developed in all the responding countries/regions. Eight member countries/regions had physician certifications for palliative care. Most essential drugs for palliative care listed by the IAHPC were available, whereas hydromorphone, oxycodone and transmucosal fentanyl were unavailable in most countries/regions. Six member countries/regions required permission to prescribe and receive opioids.

CONCLUSIONS

The development of palliative care is in different stages across the surveyed countries/regions in the Asia-Pacific region. Data from this survey can be used as baseline data for monitoring the development of palliative care in this region.

Endolaparoscopic removal of colonic polyps

AIM

A proportion of colonic polyps is not amenable to exclusively colonoscopic removal due to their location, size or tortuosity of the colon. A combined laparoscopic/colonoscopic polypectomy or endolaparoscopic polypectomy (ELP) is an alternative to formal segmental resection. We present our experience of ELP.

METHOD

This is a retrospective review of a consecutive series of patients who underwent ELP for preoperatively diagnosed benign polyps between 2010 and 2013. Data are presented as median (interquartile range, IQR).

RESULTS

Thirty patients commenced ELP. Eighteen were male and the median (IQR) age was 65.4 (61.6-73.5) years. Of 30 attempted cases, 22 (73%) underwent successful ELP surgery. Patients in whom combined ELP surgery was unsuccessful were converted to laparoscopic colectomy (one) or colonic mobilization and colotomy (seven). The median operation time for successful ELP was 105 (75-125) min. The complication rate was 13.3% and the median length of stay was 2.0 (1.0-3.0) days for successful ELP compared with 5.5 (3.5-6.8) days for converted patients (P = 0.014). The median polyp size was 14 (10-22) mm; eight (26.7%) had high-grade dysplasia with two cases of invasive cancer identified.

CONCLUSION

A combined endoscopic-laparoscopic approach provides an alternative to segmental resection for treating challenging colonic polyps. This approach appears to be safe and effective and should be offered to selected patients with benign colonic polyps.

Frequent germline deleterious mutations in DNA repair genes in familial prostate cancer cases are associated with advanced disease

BACKGROUND

Prostate cancer (PrCa) is one of the most common diseases to affect men worldwide and among the leading causes of cancer-related death. The purpose of this study was to use second-generation sequencing technology to assess the frequency of deleterious mutations in 22 tumour suppressor genes in familial PrCa and estimate the relative risk of PrCa if these genes are mutated.

METHODS

Germline DNA samples from 191 men with 3 or more cases of PrCa in their family were sequenced for 22 tumour suppressor genes using Agilent target enrichment and Illumina technology. Analysis for genetic variation was carried out by using a pipeline consisting of BWA, Genome Analysis Toolkit (GATK) and ANNOVAR. Clinical features were correlated with mutation status using standard statistical tests. Modified segregation analysis was used to determine the relative risk of PrCa conferred by the putative loss-of-function (LoF) mutations identified.

RESULTS

We discovered 14 putative LoF mutations in 191 samples (7.3%) and these mutations were more frequently associated with nodal involvement, metastasis or T4 tumour stage (P=0.00164). Segregation analysis of probands with European ancestry estimated that LoF mutations in any of the studied genes confer a relative risk of PrCa of 1.94 (95% CI: 1.56-2.42).

CONCLUSIONS

These findings show that LoF mutations in DNA repair pathway genes predispose to familial PrCa and advanced disease and therefore warrants further investigation. The clinical utility of these findings will become increasingly important as targeted screening and therapies become more widespread.