Diagnostic findings in sinonasal aspergillosis in dogs in the United Kingdom: 475 cases (2011-2021)

OBJECTIVES

To describe the diagnostic tests used and their comparative performance in dogs diagnosed with sinonasal aspergillosis in the United Kingdom. A secondary objective was to describe the signalment, clinical findings and common clinicopathologic abnormalities in sinonasal aspergillosis.

MATERIALS AND METHODS

A multi-centre retrospective survey was performed involving 23 referral centres in the United Kingdom to identify dogs diagnosed with sinonasal aspergillosis from January 2011 to December 2021. Dogs were included if fungal plaques were seen during rhinoscopy or if ancillary testing (via histopathology, culture, cytology, serology or PCR) was positive and other differential diagnoses were excluded.

RESULTS

A total of 662 cases were entered into the database across the 23 referral centres. Four hundred and seventy-five cases met the study inclusion criteria. Of these, 419 dogs had fungal plaques and compatible clinical signs. Fungal plaques were not seen in 56 dogs with turbinate destruction that had compatible clinical signs and a positive ancillary test result. Ancillary diagnostics were performed in 312 of 419 (74%) dogs with observed fungal plaques permitting calculation of sensitivity of cytology as 67%, fungal culture 59%, histopathology 47% and PCR 71%.

CLINICAL SIGNIFICANCE

The sensitivities of ancillary diagnostics in this study were lower than previously reported challenging the clinical utility of such tests in sinonasal aspergillosis. Treatment and management decisions should be based on a combination of diagnostics including imaging findings, visual inspection, and ancillary testing, rather than ancillary tests alone.

Single-step, non-surgical placement of permanent low-profile cystostomy tubes in dogs: 10 cases (2018-2023)

OBJECTIVES

Low-profile cystostomy tubes provide an alternative to conventional cystostomy tubes with external tubing. Previously, these have been placed surgically involving coeliotomy, cystotomy and cystopexy, or have been used as replacement tubes in existing stoma sites. The purpose of this study is to describe a technique for, and the outcomes of, single-step, non-surgical low-profile cystostomy tube placement.

MATERIALS AND METHODS

All cases that had single-step, non-surgical placement of low-profile cystotomy tube attempted at the authors' institutions were included in this study. Data, including success rates, outcomes and complications, were extracted from the medical records.

RESULTS

Ten client-owned dogs were inclided. Single-step, non-surgical placement was successful in eight out of 10 dogs, with placement being unsuccessful in two thus necessitating coeliotomy. The median duration that low-profile cystostomy tubes were in place was 7.0 months (range 4 days to 38 months). Seven of the eight dogs required replacement of their cystostomy tube. Mean time until first tube replacement was 103 days (range 13 to 363 days).

CLINICAL SIGNIFICANCE

Single-step, non-surgical placement of a low-profile cystostomy tube is a viable alternative to surgical placement. Lack of cystopexy does not appear to result in complications. Conversion to coeliotomy might be required if tube placement is not successful with this technique. Complications seen with non-surgical tube placement such as inadvertent tube removal were similar to those previously reported for surgically placed tubes.

Development of a 3D-printed bioabsorbable composite scaffold with mechanical properties suitable for treating large, load-bearingarticular cartilage defects

Extracellular matrix (ECM) biomaterials have shown promise for treating small artucular-joint defetcs. However, ECM-based biomaterials generally lack appropriate mechanical properties to support physiological loads and are prone to delamination in larger cartilage defects. To overcome these common mechanical limitations, a collagen hyaluronic-acid (CHyA) matrix, with proven regenerative potential, was reinforced with a bioabsorbable 3D-printed framework to support physiological loads. Polycaprolactone (PCL) was 3D-printed in two configurations, rectilinear and gyroid designs, that were extensively mechanically characterised. Both scaffold designs increased the compressive modulus of the CHyA matrices by three orders of magnitude, mimicking the physiological range (0.5-2.0 MPa) of healthy cartilage. The gyroid scaffold proved to be more flexible compared to the rectilinear scaffold, thus better contouring to the curvature of a femoral condyle. Additionally, PCL reinforcement of the CHyA matrix increased the tensile modulus and allowed for suture fixation of the scaffold to the subchondral bone, thus addressing the major challenge of biomaterial fixation to articular joint surfaces in shallow defects. In vitro evaluation confirmed successful infiltration of human mesenchymal stromal cells (MSCs) within the PCL-CHyA scaffolds, which resulted in increased production of sulphated glycosaminoglycans (sGAG/DNA; p = 0.0308) compared to non-reinforced CHyA matrices. Histological staining using alcian blue confirmed these results, while also indicating greater spatial distribution of sGAG throughout the PCL-CHyA scaffold. These findings have a great clinical importance as they provide evidence that reinforced PCL-CHyA scaffolds, with their increased chondroinductive potential and compatibility with joint fixation techniques, could be used to repair large-area chondral defects that currently lack effective treatment options.

Introducing Advanced Paramedics into the rural general practice team in Ireland – general practitioners attitudes

Introduction

As Ireland's population increases and chronic disease becomes more prevalent, demand on limited general practice services will increase. Nursing roles within general practice are now considered to be standard, yet alternative allied health professional roles are under explored within an Irish context. Allied health personnel such as Advanced Paramedics (APs) may have the capability to provide support to general practice.

Aim

To explore General Practitioners’ (GPs) attitudes and opinions of integrating Advanced Paramedics (APs) into rural general practice in Ireland.

Methods

A sequential explanatory mixed methodology was adopted. A questionnaire was designed and distributed to a purposeful sample of GPs attending a rural conference followed by semi-structured interviews. Data was recorded and transcribed verbatim and thematically analysed.

Results

In total n = 27 GPs responded to the survey and n = 13 GPs were interviewed. The majority of GPs were familiar with APs and were receptive to the concept of closely collaborating with APs within a variety of settings including out-of-hours services, home visits, nursing homes and even roles within the general practice surgery.

Conclusion

General Practitioner and Advanced Paramedic clinical practice dovetail within many facets of primary care and emergency care. GPs recognise that current rural models are unsustainable and realise the potential of integrating APs into the general practice team to help support and sustain the future of rural general practice services in Ireland. These interviews provided an exclusive, detailed insight into the world of general practice in Ireland that has not been previously documented in this way.

Supplementary Information

The online version contains supplementary material available at 10.1186/s12875-022-01740-9.

Leveraging big data of immune checkpoint blockade response identifies novel potential targets

BACKGROUND

The development of immune checkpoint blockade (ICB) has changed the way we treat various cancers. While ICB produces durable survival benefits in a number of malignancies, a large proportion of treated patients do not derive clinical benefit. Recent clinical profiling studies have shed light on molecular features and mechanisms that modulate response to ICB. Nevertheless, none of these identified molecular features were investigated in large enough cohorts to be of clinical value.

MATERIALS AND METHODS

Literature review was carried out to identify relevant studies including clinical dataset of patients treated with ICB [anti-programmed cell death protein 1 (PD-1)/programmed death-ligand 1 (PD-L1), anti-cytotoxic T-lymphocyte antigen 4 (CTLA-4) or the combination] and available sequencing data. Tumor mutational burden (TMB) and 37 previously reported gene expression (GE) signatures were computed with respect to the original publication. Biomarker association with ICB response (IR) and survival (progression-free survival/overall survival) was investigated separately within each study and combined together for meta-analysis.

RESULTS

We carried out a comparative meta-analysis of genomic and transcriptomic biomarkers of IRs in over 3600 patients across 12 tumor types and implemented an open-source web application (predictIO.ca) for exploration. TMB and 21/37 gene signatures were predictive of IRs across tumor types. We next developed a de novo GE signature (PredictIO) from our pan-cancer analysis and demonstrated its superior predictive value over other biomarkers. To identify novel targets, we computed the T-cell dysfunction score for each gene within PredictIO and their ability to predict dual PD-1/CTLA-4 blockade in mice. Two genes, F2RL1 (encoding protease-activated receptor-2) and RBFOX2 (encoding RNA-binding motif protein 9), were concurrently associated with worse ICB clinical outcomes, T-cell dysfunction in ICB-naive patients and resistance to dual PD-1/CTLA-4 blockade in preclinical models.

CONCLUSION

Our study highlights the potential of large-scale meta-analyses in identifying novel biomarkers and potential therapeutic targets for cancer immunotherapy.

Transaortic flow rate to predict short and long term outcomes in individuals with asymptomatic aortic stenosis

Background

Echocardiographic derived transaortic flow rate (TFR), defined as stroke volume over left ventricular ejection time, has been shown to be associated with increased mortality in asymptomatic mild to severe aortic stenosis (AS) and superior to stroke volume index (SVi) in individuals with symptomatic discordant AS undergoing aortic valve replacement. However, TFR has not been explored alongside SVi in asymptomatic moderate to severe AS, who are a group of interest in risk stratifying for early intervention. Moreover, there is no data where TFR is indexed to body surface area (TFRi).

Purpose

We explored the prognostic value of TFR, TFRi and SVi in a homogenous cohort of asymptomatic patients with moderate to severe AS.

Methods

Subjects with asymptomatic moderate to severe AS were prospectively recruited to the Prognostic Importance of Microvascular Dysfunction in asymptomatic patients with AS (PRIMID) study, a multi-centre observational study in the UK conducted between April 2012 and November 2014. All subjects underwent extensive phenotyping with transthoracic echocardiography, bicycle exercise testing and cardiovascular magnetic resonance (CMR) imaging, with blinded core-lab analysis. Patients were followed up in person for a minimum of 12 months, and through health records thereafter. The composite outcome of interest was: cardiovascular mortality, AVR for symptoms and major adverse cardiovascular events (hospitalisation with heart failure, myocardial infarction, syncope and arrhythmia) at one-year and at five years. A cox proportional hazards model was used to calculate a hazard ratio (HR) and 95% confidence intervals (95% CI). Known co-variables associated with the composite outcome were added into the multivariable model.

Results

Overall, 173 individuals were included with a mean age of 66.3—-±13.3 years and 76.4% were male. Most individuals had severe AS (71.1%, n=123). There were 47 (64.4%) primary outcome events at one-year and 110 (63.6%) events at five-years. Age, sex, N-terminal pro brain natriuretic peptide (NT-pro-BNP), peak aortic velocity (AV Vmax), a positive exercise tolerance test (ETT), myocardial perfusion reserve and right ventricular ejection fraction measured on cardiac magnetic resonance were included in the multivariable model in addition to TFR or TFRi or SVi. Decreasing TFR and TFRi remained independently associated with one-year and five-year composite outcome (Figure 1). However, SVi was only associated with the composite outcome at five-years. AV Vmax (HR: 4.36, 95% CI: 2.59, 7.34, p<0.01) and a positive ETT (HR: 1.87, 95% CI: 1.03, 3.37, p=0.04) were independently associated with the primary outcome at one-year.

Conclusion

Both TFR and TFRi have a potential role in risk stratifying asymptomatic patients with AS and identifying those for earlier intervention, and may be superior to SVi. However, further prospectively designed studies are needed before this becomes part of the routine clinical practice.

Funding Acknowledgement

Type of funding sources: Public grant(s) – National budget only. Main funding source(s): Independent research from a Post-Doctoral Fellowship supported by the National Institute for Health Research (NIHR-PDF 2011-04-51 Geral P McCann).

Improved screening of fall risk using free-living based accelerometer data

Falls are one of the most costly population health issues. Screening of older adults for fall risks can allow for earlier interventions and ultimately lead to better outcomes and reduced public health spending. This work proposes a solution to limitations in existing fall screening techniques by utilizing a hip-based accelerometer worn in free-living conditions. The work proposes techniques to extract fall risk features from periods of free-living ambulatory activity. Analysis of the proposed techniques is conducted and compared with existing screening methods using Functional Tests and Lab-based Gait Analysis. 1705 Older Adults from Umea (Sweden) were assessed. Data consisted of 1 Week of hip worn accelerometer data, gait measurements and performance metrics for 3 functional tests. Retrospective and Prospective fall data were also recorded based on the incidence of falls occurring 12 months before and after the study commencing respectively. Machine learning based experiments show accelerometer based measures perform best when predicting falls. Prospective falls had a sensitivity and specificity of 0.61 and 0.66 respectively while retrospective falls had a sensitivity and specificity of 0.61 and 0.68 respectively.

'You can't walk through water without getting wet' UK nurses' distress and psychological health needs during the Covid-19 pandemic: A longitudinal interview study

BACKGROUND

Pre-COVID-19 research highlighted the nursing profession worldwide as being at high risk from symptoms of burnout, post-traumatic stress disorder (PTSD) and suicide. The World Health Organization declared a pandemic on 11th March 2020 due to the sustained risk of further global spread of COVID-19. The high healthcare burden associated with COVID-19 has increased nurses' trauma and workload, thereby exacerbating pressure on an already strained workforce and causing additional psychological distress for staff.

OBJECTIVES

The Impact of COVID-19 on Nurses (ICON) interview study examined the impacts of the pandemic on frontline nursing staff's psychosocial and emotional wellbeing.

DESIGN

Longitudinal qualitative interview study.

SETTINGS

Nurses who had completed time 1 and 2 of the ICON survey were sampled to include a range of UK work settings including acute, primary and community care and care homes. Interviewees were purposively sampled for maximum variation to cover a broad range of personal and professional factors, and experiences during the COVID-19 pandemic, including redeployment.

METHODS

Nurses participated in qualitative in-depth narrative interviews after the first wave of COVID-19 in July 2020 (n = 27) and again at the beginning of the second wave in December 2020 (n = 25) via video and audio platform software. Rigorous qualitative narrative analysis was undertaken both cross-sectionally (within wave) and longitudinally (cross wave) to explore issues of consistency and change.

RESULTS

The terms moral distress, compassion fatigue, burnout and PTSD describe the emotional states reported by the majority of interviewees leading many to consider leaving the profession. Causes of this identified included care delivery challenges; insufficient staff and training; PPE challenges and frustrations. Four themes were identified: (1) 'Deathscapes' and impoverished care (2) Systemic challenges and self-preservation (3) Emotional exhaustion and (4) (Un)helpful support.

CONCLUSIONS

Nurses have been deeply affected by what they have experienced and report being forever altered with the impacts of COVID-19 persisting and deeply felt. There is an urgent need to tackle stigma to create a psychologically safe working environment and for a national COVID-19 nursing workforce recovery strategy to help restore nurse's well-being and demonstrate a valuing of the nursing workforce and therefore support retention.

Providing pharmacy support to housebound patients: learning from the COVID-19 pandemic

Introduction

Housebound patients may face challenges to their medicines management due to reduced household mobility and potential lack of access to healthcare services. Previous literature has explored the medication-related needs of housebound patients from pharmacists’ perspectives (1-2). However little work has focussed on the patient/family perspective. In this study, we used data obtained from those staying at home as much as possible during the COVID-19 pandemic to fill this gap.

Aim

To explore home medicine practices and safety for people who were housebound during the COVID19 pandemic and to create guidance, from the patient/family perspective, for enabling pharmacists to facilitate safe medicine practices for this population.

Methods

Interviews were carried out with people who were taking at least one long term medication and met the criteria for ‘shielding’ and/or were over 70 years of age during the first wave of the COVID-19 pandemic in the UK and/or their family carers. Respondents were recruited through patient and public involvement representatives, the research team’s networks, and support groups. Potential participants were approached via personal contact and social media. Interviews were conducted by telephone or video conferencing and participants asked about their medicines management while staying at home. Inductive thematic analysis was carried out. Patient and public involvement representatives were involved in the data analysis alongside the researchers.

Results

Fifty people were interviewed (16 males, 34 females; mean age 68 years, range 26–93 years). Interview data suggested diversity of experiences of medicines management while staying at home. Some respondents reported no or little change, others an initial crisis followed by re-stabilisation, and others that the pandemic was a tipping point, exacerbating underlying challenges and having negative effects on their health and wellbeing. Medicine safety issues reported included omitted doses and less-effective formulations being used. Participants also described experiencing high levels of anxiety related to obtaining medicines, monitoring medicines and feeling at risk of contracting COVID-19 while accessing medicine-related healthcare services. Key factors identified as facilitating a smooth transition included patients’ own agency, support from family, friends and community, good communication with pharmacy staff, continuity of pharmacy services and synchronisation of medicines supply so that a maximum of one collection/delivery was required each month.

Conclusion

The study findings that we have presented relate to the UK only; this may limit the generalisability of our findings to other countries. Findings from Ireland are in the process of being analysed and will provide a basis of comparison. In addition, more females took part than males, despite efforts to address this. However, our findings suggest pharmacy staff can support medicines management for people who are housebound by synchronisation of medicines supply, delivering medicines where possible, developing/raising awareness of alternative means of communication, providing continuity of pharmacy services and signposting any community support available.

References

(1) Kayyali R, Funnell G, Harrap N, Patel A. Can community pharmacy successfully bridge the gap in care for housebound patients? Research in Social and Administrative Pharmacy 2019;15:425-439.

(2) Latif A, Mandane B, Anderson E, Barraclough C, Travis S. Optimizing medicine use for people who are homebound: an evaluation of a pilot domiciliary Medicine Use Review (dMUR) service in England. Integr Pharm Res Pract 2018;7:33-40.

Systematic review of response criteria and endpoints in autoimmune hepatitis by the International Autoimmune Hepatitis Group

BACKGROUND & AIMS

Autoimmune hepatitis (AIH) has been well characterised and codified through the development of diagnostic criteria. These criteria have been adapted and simplified and are widely used in clinical practice. However, there is a need to update and precisely define the criteria for both treatment response and treatment.

METHODS

A systematic review was performed and a modified Delphi consensus process was used to identify and redefine the response criteria in autoimmune hepatitis.

RESULTS

The consensus process initiated by the International Autoimmune Hepatitis Group proposes that the term 'complete biochemical response' defined as 'normalization of serum transaminases and IgG below the upper limit of normal' be adopted to include a time point at 6 months after initiation of treatment. An insufficient response by 6 months was a failure to meet the above definition. Non-response was defined as '<50% decrease of serum transaminases within 4 weeks after initiation of treatment'. Remission is defined as liver histology with a Hepatitis Activity Index <4/18. Intolerance to treatment was agreed to stand for 'any adverse event possibly related to treatment leading to potential drug discontinuation'.

CONCLUSIONS

These definitions provide a simple and reproducible framework to define treatment response and non-response, irrespective of the therapeutic intervention. A consensus on endpoints is urgently required to set a global standard for the reporting of study results and to enable inter-study comparisons. Future prospective database studies are needed to validate these endpoints.

LAY SUMMARY

Consensus among international experts on response criteria and endpoints in autoimmune hepatitis is lacking. A consensus on endpoints is urgently required to set a global standard for the reporting of study results and to enable the comparison of results between clinical trials. Therefore, the International Autoimmune Hepatitis Group (IAIHG) herein presents a statement on 5 agreed response criteria and endpoints: complete biochemical response, insufficient response, non-response, remission, and intolerance to treatment, which can be used to guide future reporting.

Genetic and phenotypic characteristics of Clostridium (Clostridioides) difficile from canine, bovine, and pediatric populations

Objectives:

Carriage of Clostridioides difficile by different species of animals has led to speculation that animals could represent a reservoir of this pathogen for human infections. The objective of this study was to compare C. difficile isolates from humans, dogs, and cattle from a restricted geographic area.

Methods:

C. difficile isolates from 36 dogs and 15 dairy calves underwent whole genome sequencing, and phenotypic assays assessing growth and virulence were performed. Genomes of animal-derived isolates were compared to 29 genomes of isolates from a pediatric population as well as 44 reference genomes.

Results:

Growth rates and relative cytotoxicity of isolates were significantly higher and lower, respectively, in bovine-derived isolates compared to pediatric- and canine-derived isolates. Analysis of core genes showed clustering by host species, though in a few cases, human strains co-clustered with canine or bovine strains, suggesting possible interspecies transmission. Geographic differences (e.g., farm, litter) were small compared to differences between species. In an analysis of accessory genes, the total number of genes in each genome varied between host species, with 6.7% of functional orthologs differentially present/absent between host species and bovine-derived strains having the lowest number of genes. Canine-derived isolates were most likely to be non-toxigenic and more likely to carry phages. A targeted study of episomes identified in local pediatric strains showed sharing of a methicillin-resistance plasmid with dogs, and historic sharing of a wide range of episomes across hosts. Bovine-derived isolates harbored the widest variety of antibiotic-resistance genes, followed by canine

Conclusions:

While C. difficile isolates mostly clustered by host species, occasional co-clustering of canine and pediatric-derived isolates suggests the possibility of interspecies transmission. The presence of a pool of resistance genes in animal-derived isolates with the potential to appear in humans given sufficient pressure from antibiotic use warrants concern.

Prostatitis and prostatic abscessation in dogs: retrospective study of 82 cases

OBJECTIVES

To describe clinical signs, diagnostics, treatments and outcomes of prostatitis and prostatic abscesses of dogs in a referral population.

ANIMALS

Eighty-two dogs diagnosed with prostatitis and/or prostatic abscesses from three referral hospitals.

PROCEDURES

Retrospective case series.

RESULTS

A total of 82 dogs were included, and the median age was nine years. Acute prostatitis was diagnosed in 63% of cases, chronic prostatitis in 37% of cases and 40% of cases had prostatic abscessation. Prostatomegaly was the most common ultrasonographic finding. Mineralisation was identified in 20% of cases. The results of urine and prostatic bacterial culture were concordant in only 50% of cases. Antimicrobial resistance was encountered commonly, with 29% of cultures resistant to one antimicrobial and 52% resistant to two or more antimicrobials. Abscesses were treated with either antimicrobials alone, ultrasound-guided needle drainage or surgical drainage.

CONCLUSIONS AND CLINICAL RELEVANCE

With antimicrobial treatment and castration, the prognosis for canine prostatitis appears good. Prostatic abscessation is commonly encountered and does not appear to infer a worse prognosis and antimicrobials alone, ultrasound-guided needle drainage and surgical drainage all appear to be reasonable treatment options. Antimicrobial resistance is commonly encountered, and the results of urine culture and susceptibility testing are frequently discordant with those from samples from the prostate. Sampling of the prostate is required to confirm a diagnosis and exclude other pathologies such as neoplasia, particularly as mineralisation is seen in a reasonable number of cases of dogs with prostatitis.

Electronic hand hygiene monitoring systems can be well-tolerated by health workers: Findings of a qualitative study

Background:

Electronic hand hygiene monitoring overcomes limitations associated with manual audit but acceptability to health workers varies and may depend on culture of the ward and the nature of the system.

Objectives:

Evaluate the acceptability of a new fifth type electronic monitoring system to frontline health workers in a National Health Service trust in the UK.

Methods:

Qualitative interviews with 11 informants following 12 months experience using an electronic monitoring system.

Results:

Informants recognised the importance of hand hygiene and embraced technology to improve adherence. Barriers to hand hygiene adherence included heavy workload, dealing with emergencies and ergonomic factors related to placement of alcohol dispensers. Opinions about the validity of the automated readings were conflicting. Some health workers thought they were accurate. Others reported problems associated with differences in the intelligence of the system and their own clinical decisions. Opinions about feedback were diverse. Some health workers thought the system increased personal accountability for hand hygiene. Others ignored feedback on suboptimal performance or ignored the data altogether. It was hard for health workers to understand why the system registered some instances of poor performance because feedback did not allow omissions in hand hygiene to be related to the context of care.

Conclusion:

Electronic monitoring can be very well tolerated despite some limitations. Further research needs to explore different reactions to feedback and how often clinical emergencies arise. Electronic and manual audit have complementary strengths.

Non-inflammatory joint effusions as a presenting sign of hypothyroidism in a dog

Non-inflammatory joint effusion with characteristically increased synovial fluid viscosity is a rare but well-recognised rheumatic manifestation of hypothyroidism in people and based on the literature search, this is the first report of the condition in dogs. A 2-year-old Pyrenean Mountain dog presented for lameness and multiple joint effusions. CT confirmed effusions affecting multiple limb joints along with delayed closure of multiple physes. Synovial fluid analysis from the effused joints showed no evidence of inflammation but the fluid viscosity was markedly increased. Serum total thyroxine concentration was decreased, thyroid-stimulating hormone concentration was increased and antithyroglobulin autoantibody measurement returned a positive result. Oral levothyroxine supplementation resulted in relatively rapid and complete resolution of the clinical signs, in association with attaining a euthyroid state. Follow-up examination and CT six months later confirmed resolution of the joint effusions and significant improvement or resolution of the other documented skeletal changes.

HIV cure research in the time of COVID-19 - Antiretroviral therapy treatment interruption trials: A discussion paper

This discussion paper addresses the safety of HIV cure studies, particularly those involving stopping antiretroviral therapy, known as an analytic treatment interruption (ATI) in the context of the SARS-CoV-2 pandemic. More than 30 studies listed on ClinicalTrials.gov include an ATI and many others were planned to begin over the next 12 months but most were halted due to the COVID-19 pandemic. We consider the ethics, risks and practical considerations to be taken into account before re-opening HIV cure clinical trials, noting the specific risks of ATI in the context of circulating SARS-CoV-2.

Non-immunotherapy options for the first-line management of hepatocellular carcinoma: exploring the evolving role of sorafenib and lenvatinib in advanced disease

The results of the sharp trial established sorafenib, a tyrosine kinase inhibitor (tki), as the sole first-line treatment option in advanced hepatocellular carcinoma (hcc) for more than a decade. In 2020, there has been a surge in new therapies for hcc, including immunotherapeutic strategies and the approval of a number of novel tkis. In addition to sorafenib, lenvatinib and combination atezolizumab-bevacizumab now represent standard first-line treatment options. As those systemic therapy options begin to be better utilized, assurance of adequate liver function and optimal timing are required to improve patient outcomes. Furthermore, sequencing of the agents will have to be carefully tailored, given the increasing armamentarium of choices. Here, we discuss the role of lenvatinib and sorafenib in the first-line management of hcc.

Degradation of a leather-dye by the combination of depolymerised wood-chip biochar adsorption and solid-state fermentation with Trametes villosa SCS-10

Adsorption into biochar-derived materials and mycoremediation are promising technologies for removing dyes from solid and liquid matrices. This study presents a combined treatment with adsorption into wood-chip biochar and mycodegradation under solid-state fermentation by Trametes villosa for removing the leather-dye Acid Blue 161. In the first stage, untreated wood-chip biochar, NaOH–depolymerised biochar and KMnO4–depolymerised biochar were assessed for their dye removal efficiency by adsorption. KMnO4–depolymerised biochar exhibited the highest adsorption (85.1 ± 1.9%) after 24 h of contact. KMnO4–depolymerisation modified some physical and chemical properties on the untreated wood-chip biochar, increasing the surface area (50.4 m2 g–1), pore size (1.9 nm), and presence of surface functional groups. Response surface methodology coupled with a Box–Behnken design was used to optimise the AB161 adsorption into the KMnO4–depolymerised biochar. The optimised conditions, pH 3.0, dye concentration 100 mg L–1 and sorbent dosage 2 g L–1, led to a higher dye removal efficiency by adsorption (91.9 ± 1.0%). In a second stage, the wood-chip biochar supplemented with nutrients (1% malt extract and 0.5% peptone) was employed as a solid matrix for growing T. villosa and regenerating the dye-saturated material. After 15 days, T. villosa was able to grow (86.8 ± 0.8%), exhibit laccase activity (621.9 ± 62.3 U L–1), and biodegrade (91.4 ± 1.3%) the dye adsorbed into the KMnO4–depolymerised biochar. Finally, the mycoregenerated biochar was reutilised in a new cycle of adsorption reaching 79.5 ± 2.0% of dye removal efficiency by adsorption. This study revealed the potential of the combined treatment and is an initial assessment for developing commercial alternatives for treating leather industry wastewaters.

Designing a flexible tool for rapid implementation of brain-computer interfaces (BCI) in game development

Early neurological injury or disease can lead to severe life-long physical impairments, despite normal cognitive function. For such individuals, brain-computer interfaces (BCI) may provide a means to regain access to the world by offering control of systems through directly processing brain patterns. However, current BCI applications are often research driven and consequently seen as uninteresting, particularly for prolonged use and younger BCI-users. To help mitigate this concern, this paper establishes a tool for researchers and game developers alike to rapidly incorporate a BCI control scheme (the P300 oddball response) into a gaming environment. Preliminary results indicate the proposed P300 Dynamic Cube (PDC) asset works in online BCI environments (n=20, healthy adult participants), resulting in median classification accuracy of 75 ± 3.28%. Additionally, the PDC tool can be rapidly adapted for a variety of game designs, evidenced by its incorporation into submissions to the Brain-Computer Interface (BCI) Game Jam 2019 competition. These findings support the PDC as a useful asset in the design and development of BCI-based games.

Aboriginal Human Research Ethics Committees ensuring culturally appropriate research

Aboriginal and Torres Strait Islander people, Australia's Indigenous peoples, make up three percent of the population of Australia. Like many other Indigenous peoples in colonised countries, they suffer the worst health and social status of any population group. Australian Indigenous people have a lower life expectancy (8.6 years lower for men and 7.8 years for women) compared with other Australians (ABS 2018a). The reasons for the poorer health outcomes are complex and include historical, political and social factors (AIHW 2015a).

The health disparity has driven a high number of research projects with a focus on Australian Indigenous people or mainstream research projects where Australian Indigenous people are overrepresented. Given the uniqueness of Australian Indigenous cultures as well as the historical, political and social context, in 1998, the Aboriginal Health and Medical Research Council of New South Wales (AH&MRC) established an Australian Indigenous-specific human research ethics committee (HREC). The AH&MRC is the Indigenous peak health body of New South Wales.

This presentation will outline the role and benefit of the AH&MRC HREC as a specialised HREC. The AH&MRC HREC is fully constituted and registered under the National Health and Medical Research Council (NHMRC). The NHMRC is the leading expert body in health and medical research in Australia and develops health research guidelines. The AH&MRC HREC is one of three AHRECs in Australia. The AH&MRC Ethics Committee not only guarantees that research is conducted ethically but also ensures research involving Indigenous people is undertaken in a culturally appropriate manner. One of the key elements required by the AH&MRC is that researchers consult Indigenous communities across all stages of the project from the design, implementation, analysis and write up.

The AH&MRC HREC is essential, ensuring the research is of benefit to the Indigenous community in NSW and is conducted in a culturally safe manner.

Key messages

Specialised Indigenous human resarch ethics committees are vital to enuring research is culturally appropriate. Spscialised human resarch ethics committees can be of benefit for other disctinct populations.

Two-week rule: suspected head and neck cancer referrals from a general medical practice perspective

The two-week rule (2WR) referral system was designed to fast-track patients with suspected malignancies to secondary care services to facilitate prompt investigation and management, the ultimate goals being early detection and improved survival. Patients with symptoms of head and neck cancer primarily present to the general practitioner (GP) who has an important role in the identification of high-risk patients for prompt management. This paper reports urgent 2WR referrals from primary care to highlight difficulties in the referral process. Data were collected from three GP practices (16 GPs) in Merseyside that all used the EMIS Web system (EMIS Health). All patients who were referred on the 2WR pathway in a two-year period from January 2017 were identified (n=113). The conversion rate for malignant diagnosis was 5.5% (95% CI: 2.0 to 11.5%). Those with multiple symptoms had a higher rate of malignancy (16%, 3/19) than those with a single symptom (3%, 3/91) (p=0.06). In total, 76% of patients had had no treatment before referral. The duration of symptoms ranged from 1 - 208 weeks (median (IQR) 6 (4-12) weeks). Common benign symptoms included laryngopharyngeal reflux (n=27), thyroid lesion (n=9), and neck lymph node (n=7). The diagnosis of head and neck cancer in primary care is challenging. Initiatives to try to increase the cancer conversion rate are required, but they run the risk of missed diagnosis and increased delay. Sufficient resources are needed in secondary care to ensure the timely assessment of patients who are referred on the 2WR pathway.

A Child's Right to Play: Results from the Brain-Computer Interface Game Jam 2019 (Calgary Competition)

Children with severe neurological disabilities may be unable to communicate or interact with their environments, depriving them of their right to play. Brain-computer interfaces (BCI) offer a means for such children to control external devices using only their brain signals, thereby introducing new opportunities for interaction. We organized the first North American BCI Game Jam to incite the development of BCI-compatible games for children. Nine games were submitted by 30 participants across North America. Games were judged by researchers and disabled children currently using BCI. Preliminary results demonstrate variety in game criteria preferences amongst the children who judged the games. The BCI Game Jam demonstrated promising potential for the creation of enjoyable games to suit the individual needs and preferences of children with severe neurological disabilities.

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.

SAT0143 A PHASE 1 STUDY IN HEALTHY VOLUNTEERS EXPLORING THE SAFETY, PHARMACOKINETICS AND PHARMACODYNAMICS OF ATI-450: A NOVEL ORAL MK2 INHIBITOR

Background:

ATI-450, is an investigational small molecule inhibitor of the MAPK-activated protein kinase 2 (MK2) signaling pathway. This pathway drives the expression of multiple cytokines including TNFα, IL-1α and β, and IL-6.

Objectives:

We evaluated the safety and tolerability of ATI-450 in healthy volunteers as well as pharmacokinetics (PK) and pharmacodynamics (PD). Here we present data from single and multiple ascending dose cohorts. The aim was to select a dose for evaluation in phase 2 in patients with rheumatoid arthritis.

Methods:

Safety, PK and PD were assessed in a randomized, observer-blind, placebo-controlled, phase 1 study in male and female healthy subjects aged 18-55 (n=77).

Safety and tolerability of ATI-450 was evaluated based on adverse events, clinical laboratory, vital signs, 12-lead ECG, Holter monitoring, and physical examination. Blood was drawn for PK analysis at 0.5, 1, 2, 4, 6, 8, 12 hours, 24, 36, and 48 hours post dose in the SAD cohort and on day 7 of the MAD cohort. PD of ATI-450 were explored by investigating the inhibition of a target biomarker, phospho-HSP27 (pHSP27) and proinflammatory cytokines, TNFα, IL1β, IL6 and IL8 inex-vivoLPS-stimulated blood samples collected 4 and 12 hours post dose on day 7 from subjects in the MAD cohorts.

Results:

ATI-450 was generally well tolerated. No serious adverse events or severe adverse events were reported, and no adverse events led to discontinuation of the study medication. The most common adverse events (reported by 2 or more subjects who received ATI-450) observed during the trial were dizziness, headache, upper respiratory tract infection, constipation, nausea, and abdominal pain. All adverse events were mild. A trend of a decrease in absolute neutrophil count (ANC) was observed without correlated clinical sequelae.

ATI-450 had dose proportional PK with a terminal half-life (t½) of 9-12 hours in the MAD cohort on day 7. A dose and concentration dependent inhibition ofex vivostimulated cytokines and target biomarker was observed. On day 7, patients in the 50mg BID dose (the dose with the highest degree of inhibition) recorded mean trough drug levels (12 hours post dose) that were 1.4, 2.5, 2.5 and 2.4 times greater than the IC80for TNFα, IL1β, IL8 and pHSP27 respectively. Mean Cmax drug levels (4 hours post dose) were 3.6, 6.4, 6.2 and 6.0 times greater than the IC80for TNFα, IL1β, IL8 and pHSP27 respectively. IL6 levels were inhibited by more than 50% for part of the dosing interval.

Conclusion:

Oral ATI-450 was generally well tolerated at all doses with dose proportional PK. The t½ suggests that once or twice daily oral dosing may be possible. At the 50mg BID dose, marked inhibition of TNFα, IL1β and IL8, IL6 and pHSP27 was observed. ATI-450 has the potential to be an oral, small molecule drug which can target multiple cytokines. Exploration of its benefit to risk profile in patients with rheumatoid arthritis is warranted.

Disclosure of Interests:

Judy Schnyder Shareholder of: aclaris therapeutics, Employee of: aclaris therapeutics, Joe Monahan Shareholder of: aclaris therapeutics, Employee of: aclaris therapeutics, Walter Smith Shareholder of: aclaris therapeutics, Employee of: aclaris therapeutics, Heidi Hope Shareholder of: aclaris therapeutics, Employee of: aclaris therapeutics, Deborah Kelly Shareholder of: aclaris therapeutics, Employee of: aclaris therapeutics, David Burt Shareholder of: aclaris therapeutics, Employee of: aclaris therapeutics, E Huff Shareholder of: aclaris therapeutics, Employee of: aclaris therapeutics, A Kaul Shareholder of: aclaris therapeutics, Employee of: aclaris therapeutics, A Hildebrand Shareholder of: aclaris therapeutics, Employee of: aclaris therapeutics, B Burnette Shareholder of: aclaris therapeutics, Employee of: aclaris therapeutics, N Klug Shareholder of: aclaris therapeutics, Employee of: aclaris therapeutics, M Bangs Shareholder of: Aclaris Therapeutics, Employee of: Aclaris Therapeutics, David Gordon Shareholder of: aclaris therapeutics, Employee of: aclaris therapeutics

Renegotiation of identity in young adults with cancer: A longitudinal narrative study

BACKGROUND

Despite increasing international awareness of the impact of cancer on young adults, to date there has been limited in-depth research to understand their experiences following a diagnosis using a qualitative and longitudinal perspective.

OBJECTIVES

To explore the impact of cancer on young adults' evolving sense of self and identity over one year from the time of diagnosis. In addition, to contribute further to an understanding of innovative research methods used to examine this experience.

DESIGN

This was a longitudinal narrative study using visual methods and a psychosocial lens. Narrative was used to re-present experiences over time.

SETTING AND SAMPLE

Recruitment was from a Principal Treatment Centre for Teenagers and Young Adults with Cancer and a Cancer Centre for Adults in the United Kingdom. Total population sampling was used over a six-month period, recruiting 18 young adults aged between 16 and 30, one to three months from a diagnosis of bone cancer, lymphoma or leukaemia.

METHODS

In depth, free association narrative interviews at three-time points over a year were undertaken. Photographs were used to help with story-telling. Extensive reflexive field notes, debriefing and the use of a psychosocial research group, also formed data sources. Forty interviews were conducted with 18 participants: eight took part in three interviews, six in two interviews and four in one interview. Analysis focused on the holistic 'case' of the individual temporally. In-depth, visual images were analysed from discussion in the narrative text. Through memoing, coding and comparison, themes were developed across all cases and a conceptual framework developed.

RESULTS

The conceptual framework illustrates the renegotiation of self over time through narrative. This was 'biographically' during young adult development and across 'cancer time'; through the core components of: the inner world, (psyche, emotion and coping); self as embodied; self as relating to others, and self as relating to place. Stories indicated that there was a constant inter- relationship over time between the renegotiation of identity and adaption of biography.

CONCLUSIONS

The focus in this paper is on 'the temporality of cancer' through the first year from diagnosis, and the juxtaposed process of managing biographical and developmental milestones. The importance of developing health care and research which enables narrative and the patient's voice has been highlighted. It emphasises the need for professionals to 'be with' and 'walk alongside' through the intensity of a biographically and identity changing illness. Using longitudinal narrative, visual & psychosocial methods to describe the impact of a diagnosis of cancer on young adults' sense of biography and identity.

Biofabrication of multiscale bone extracellular matrix scaffolds for bone tissue engineering

Interconnected porosity is critical to the design of regenerative scaffolds, as it permits cell migration, vascularisation and diffusion of nutrients and regulatory molecules inside the scaffold. 3D printing is a promising strategy to achieve this as it allows the control over scaffold pore size, porosity and interconnectivity. Thus, the aim of the present study was to integrate distinct biofabrication strategies to develop a multiscale porous scaffold that was not only mechanically functional at the time of implantation, but also facilitated rapid vascularisation and provided stem cells with appropriate cues to enable their differentiation into osteoblasts. To achieve this, polycaprolactone (PCL) was functionalised with decellularised bone extracellular matrix (ECM), to produce osteoinductive filaments for 3D printing. The addition of bone ECM to the PCL not only increased the mechanical properties of the resulting scaffold, but also increased cellular attachment and enhanced osteogenesis of mesenchymal stem cells (MSCs). In vivo, scaffold pore size determined the level of vascularisation, with a larger filament spacing supporting faster vessel in-growth and more new bone formation. By freeze-drying solubilised bone ECM within these 3D-printed scaffolds, it was possible to introduce a matrix network with microscale porosity that further enhanced cellular attachment in vitro and increased vessel infiltration and overall levels of new bone formation in vivo. To conclude, an "off-the-shelf" multiscale bone-ECM-derived scaffold was developed that was mechanically stable and, once implanted in vivo, will drive vascularisation and, ultimately, lead to bone regeneration.

P3493Uremic toxin induced endothelial dysfunction can be restored by inhibition of the aryl hydrocarbon receptor: implications for cardiovascular disease treatment in chronic kidney disease patients

Introduction

Cardiovascular disease (CVD) mortality is significantly higher in chronic kidney disease (CKD) patients, with vascular calcification and atherosclerosis proving to be major contributors. Endothelial dysfunction is an early marker of atherosclerosis, triggered by oxidative stress and reduced nitric oxide production. The uremic toxin indoxyl sulphate (IS), a protein-bound non-dialyzable molecule derived from dietary tryptophan that accumulates in the blood of CKD patients, activates the aryl hydrocarbon receptor (AhR) promoting downstream cytochrome P450 1A1 (CYP1A1) expression mediating oxidative stress and potentially endothelial dysfunction. Targeting IS-induced AhR activation in the endothelium has not previously been examined and may represent a novel approach in targeting endothelial dysfunction.

Purpose

To assess the ability of the AhR antagonist, CH223191, to inhibit IS-mediated impairment of endothelial function and disruption of redox balance.

Methods

To assess endothelium-dependent relaxation, the thoracic aorta from adult male Sprague Dawley rats (N=10) were used in ex vivo experiments. Rings (5mm) from the aorta were exposed to IS (300μM) in the presence and absence of the AhR antagonist CH223191 (1 and 10μM), prior to pre-constriction of the vessel with phenylephrine (30μM) followed by relaxation with acetylcholine (ACh; 1nM-30μM). Control rings were not exposed to IS or CH223191 to determine normal endothelial responses to ACh. Responses were recorded with isometric force transducers connected to a PowerLab using Chart Software. Tissue sections from these rings were stained for superoxide using dihydroethidium. To examine key AhR-mediated oxidative stress pathways, separate aortic rings were exposed to IS and CH223191, under the above conditions, for 4 hours prior to RNA extraction and real-time PCR analysis.

Results

IS reduced the maximum level of endothelium-dependent relaxation (Rmax) to 50.17±2.71% (P<0.001) compared to control (86.00±3.93%). In the presence of IS, CH223191 restored Rmax to 77.74±3.14% (1μM) and 81.63±3.27% (10μM) (Figure, P<0.001). The potency of ACh, known as the pEC50 (negative logarithm of the effective concentration of ACh to produce a relaxation response of 50%), in control tissues (−7.08±0.07) was increased 100-fold following exposure of IS (−5.10±0.13; P<0.001). CH223191 restored pEC50 back to control values (1μM, −6.62±0.09; 10μM, −6.83±0.08; P<0.05). IS-exposed rings increased superoxide expression (P<0.001) and CYP1A1 gene expression (P<0.001), CH223191 restored expression of both superoxide (P<0.001) and CYP1A1 (P<0.001) back to control levels.

CH223191 restores endothelial function

Conclusion

Our findings demonstrate the adverse impact of IS-mediated AhR activation on the vascular endothelium, where oxidative stress may play a critical role inducing endothelial dysfunction in the vasculature of the heart and kidneys. AhR inhibition may provide a novel therapy for CVD in the CKD setting.

Acknowledgement/Funding

National Health and Medical Research Council of Australia Program Grant

Pore-forming bioinks to enable spatio-temporally defined gene delivery in bioprinted tissues

The regeneration of complex tissues and organs remains a major clinical challenge. With a view towards bioprinting such tissues, we developed a new class of pore-forming bioink to spatially and temporally control the presentation of therapeutic genes within bioprinted tissues. By blending sacrificial and stable hydrogels, we were able to produce bioinks whose porosity increased with time following printing. When combined with amphipathic peptide-based plasmid DNA delivery, these bioinks supported enhanced non-viral gene transfer to stem cells in vitro. By modulating the porosity of these bioinks, it was possible to direct either rapid and transient (pore-forming bioinks), or slower and more sustained (solid bioinks) transfection of host or transplanted cells in vivo. To demonstrate the utility of these bioinks for the bioprinting of spatially complex tissues, they were next used to zonally position stem cells and plasmids encoding for either osteogenic (BMP2) or chondrogenic (combination of TGF-β3, BMP2 and SOX9) genes within networks of 3D printed thermoplastic fibers to produce mechanically reinforced, gene activated constructs. In vivo, these bioprinted tissues supported the development of a vascularised, bony tissue overlaid by a layer of stable cartilage. When combined with multiple-tool biofabrication strategies, these gene activated bioinks can enable the bioprinting of a wide range of spatially complex tissues.

Estimating degradation-related settlement in two landfill-reclaimed soils by sand-salt analogues

Landfill reclaimed soil here refers to largely degraded materials excavated from old landfill sites, which after processing can be reinstated as more competent fill, thereby restoring the former landfill space. The success of the process depends on the presence of remaining degradable particles and their influence on settlement. Tests on salt-sand mixtures, from which the salt is removed, have been used to quantify the impact of particle loss on settlement. Where the amount of particle loss is small, say 10% by mass or less, settlements are small and apparently independent of lost particle size. A conceptual model is presented to explain this behaviour in terms of nestling particles and strong force chains. At higher percentages of lost particles, greater rates of settlement together with some sensitivity to particle size were observed. The conceptual model was then applied to two landfill reclaimed soils, the long-term settlements of which were found to be consistent with the conceptual model suggesting that knowledge of particle content and relative size are sufficient to estimate the influence of degradable particles in landfill reclaimed soils.

Outcomes of a Clinical Leadership Training Program Amongst Hospital Doctors

Aim To evaluate the effectiveness of formal leadership training amongst medical trainees and to review the current literature in this area. Methods A literature review of all PubMed cited articles on Physician Leadership from November 2015 to July 2017 was undertaken. Twenty exemplary articles on physician leadership were identified. Fifteen out of 20 were surveys, several of which included a qualitative component, Two out of 20 were cross-sectional analysis and 3/20 involved structured interviews. Overall findings showed that, formalised teaching of leadership tools is associated with improvements in emotional intelligence, self-confidence, and enhanced relationships with colleagues. In addition, having undergone such training, Doctors had an increased ability to manage conflict, conduct meetings and direct groups. The Non-Consultant Hospital Doctor (NCHD) Committee in The Mater Misericordiae University Hospital (MMUH) identified a need for additional leadership and managerial training to support their current role within the Health Service Executive (HSE). The committee devised an educational lecture series in collaboration with leaders in healthcare, business and management. Verbal and written feedback was collected in the form of an end of course survey and attendance was documented. Results Twenty-five NCHDs attended the Clinical Leadership Programme in MMUH. Fifty-two percent (52%) attended all 5 lectures. Twenty-eight percent (28%) of attendees were male and 72% were female. Eighty percent (80%) were basic specialist trainees or interns and 20% were registrars or higher medical trainees. All participants found the leadership course to be a positive learning experience and reported improvements in leadership skills, management, business planning, career development and quality improvement. Eighty-four percent (84%) were interested in furthering their study in clinical leadership. Ninety-two percent (92%) of participants noted an improvement in hospital wide morale amongst NCHDs following the course. Discussion This series could be replicated in other hospitals throughout the HSE and represents one solution to deliver clinical leadership and management training to NCHDs

Abstract P6-08-17: Pregnancy associated breast cancer: Evaluating maternal outcomes. A multicentre study

Background

Pregnancy associated breast cancer (PABC) is defined as breast cancer (BC) diagnosed during the gestational period (GP) or in the first year postpartum (PP). Despite its infrequent occurrence, the incidence of PABC appears to be rising due to the increasing propensity for women to delay childbirth. We have established the first combined prospective and retrospective registry study of PABC in Ireland to examine specific clinicopathological characteristics, treatments and maternal outcomes. We present the retrospective findings to date.

Methods

We performed a retrospective multicentre observational study of patients (pts) with PABC treated in the eight Irish cancer centres from August 2001 to March 2017. Data extracted included information on pt demographics, tumour biology, staging, treatment administered and maternal outcomes. Standard biostatistical methods were used for analysis.

Results

111 PABC patients were identified. Sixty pts (54%) were diagnosed during the GP and 51 (46%) within 1 year PP. Median age at diagnosis was 36 years (yrs). Table 1 illustrates baseline characteristics. Two thirds of pts were node positive and a similar proportion had grade 3 pathology. Seventy pts (63%) were estrogen receptor (ER) positive, 36 (32%) HER2 positive, 25 (22%) triple negative. Twenty-two pts (20%) were metastatic at presentation. Seven pts (6%) had a known BRCA 1/2 mutation. The median OS (overall survival) and DFS (disease free survival) for the entire cohort was 107.4 and 94.2 months respectively (resp). There was no survival difference between those diagnosed during the GP versus PP. 5 yr DFS and OS was 68.6% and 69.2% resp. This compares unfavourably to results reported by the National Cancer Registry of Ireland in a similar age-matched BC population between 2000-2012 where the 5 yr OS was 86.5%. Variables in our study associated with poorer outcomes included younger age, tumour size, node positivity and lack of estrogen expression.

Baseline characteristics PABC patients (n=11) %(n)Diagnosed in GP (n=60) %(n)Diagnosed 1yr PP (n=51) %(n)p valueDemographic    Age at diagnosis3636(25-49)36(21-44)0.31Stage    I-II54(60)55(33)53(27)0.85III23(26)23(14)23(12)1IV20(22)18(11)22(11)0.81Unknown3(3)3(2)2(1)1Pathology    Grade 366(74)70(42)63(32)0.43Node positive66(73)68(41)63(32)0.55ER+/HER2-41(45)38(23)43(22)0.69ER+/HER2+23(25)28(17)16(8)0.17ER-/HER2+14(16)17(10)12(6)0.59Triple negative22(25)17(10)29(15)0.11Surgery    Breast conservation23(26)25(15)21(11)0.82Mastectomy56(63)57(34)59(30)0.84Adjuavnt/Neoadjuvant treatment    Chemotherapy73(81)77(46)69(35)0.39Anthracycline68(55)78(36)54(19)0.03Taxane89(72)93(43)83(29)0.16Anti HER2 agent21(23)18(11)24(12)0.63Endocrine therapy64(52)63(29)66(23)0.84Radiotherapy79(64)74(34)86(30)0.85Relapse in Stage I-III    Local relapse15(13)12(6)18(7)0.55Distant relapse24(21)22(11)25(10)0.80

Conclusions

PABC patients may have a poorer outcome. Our study reported higher rates of triple negative and HER2 positive breast cancer which are associated with more aggressive biology. Prospective evaluation of clinicopathological features, pharmacokinetics of treatments selected and maternal and fetal outcomes is imperative in this distinct pt group.

Citation Format: Prior L, Teo M, Greally M, Ward C, O'Leary C, Aslam R, Darwish W, Ahmed N, Watson G, Kelly D, Kiely L, Hassan A, Gleeson J, Featherstone H, Lim M, Murray H, Gallagher D, Westrup J, Hennessy B, Leonard G, Grogan L, Breathnach O, Horgan A, Coate L, O'Mahony D, Coate L, O'Reilly S, Gupta R, Keane M, Duffy K, O'Connor M, Kennedy J, McCaffrey J, Higgins M, Kelly C, Carney D, Gullo G, Crown J, Walshe J. Pregnancy associated breast cancer: Evaluating maternal outcomes. A multicentre study [abstract]. In: Proceedings of the 2017 San Antonio Breast Cancer Symposium; 2017 Dec 5-9; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2018;78(4 Suppl):Abstract nr P6-08-17.