Influence of meteorological variables and air pollutants on measurements from automatic pollen sampling devices

This study examines the influence of meteorological factors and air pollutants on the performance of automatic pollen monitoring devices, as part of the EUMETNET Autopollen COST ADOPT-intercomparison campaign held in Munich, Germany, during the 2021 pollen season. The campaign offered a unique opportunity to compare all automatic monitors available at the time, a Plair Rapid-E, a Hund-Wetzlar BAA500, an OPC Alphasense, a KH-3000 Yamatronics, three Swisens Polenos, a PollenSense APS, a FLIR IBAC2, a DMT WIBS-5, an Aerotape Sextant, to the average of four manual Hirst traps, under the same environmental conditions. The investigation aimed to elucidate how meteorological factors and air pollution impact particle capture and identification efficiency. The analysis showed coherent results for most devices regarding the correlation between environmental conditions and pollen concentrations. This reflects on one hand, a significant correlation between weather and airborne pollen concentration, and on the other hand the capability of devices to provide meaningful data under the conditions under which measurements were taken. However, correlation strength varied among devices, reflecting differences in design, algorithms, or sensors used. Additionally, it was observed that different algorithms applied to the same dataset resulted in different concentration outputs, highlighting the role of algorithm design in these systems (monitor + algorithm). Notably, no significant influence from air pollutants on the pollen concentrations was observed, suggesting that any potential difference in effect on the systems might require higher air pollution concentrations or more complex interactions. However, results from some monitors were affected to a minor degree by specific weather variables. Our findings suggest that the application of real-time devices in urban environments should focus on the associated algorithm that classifies pollen taxa. The impact of air pollution, although not to be excluded, is of secondary concern as long as the pollution levels are similar to a large European city like Munich.

Living with dementia: Exploring the intersections of culture, race, and dementia, stigma

Research documents the presence of stigma and discrimination as key components in the lived experience of dementia. However, to date, there is limited understanding regarding how social location, particularly as it relates to culture and race, may shape this experience of stigma and discrimination. In this qualitative exploratory study, personal interviews were held with ten Chinese Canadians living with dementia focused on better understanding how culture, race, and dementia stigma influence their experiences. From the onset, themes related to stigma and discrimination were woven into the participants' stories about living with dementia. Consistent with other research, all participants described an increased sense of vulnerability and invisibility related to how both they and others responded to their diagnosis of dementia. Participants also provided examples of how this experience of stigma was compounded by culture, race, and immigration status. Importantly, these acts of stigma and discrimination were both externally and internally imposed, resulting in feelings of lack of safety and insecurity. This research draws attention to the increased vulnerability that accompanies a diagnosis of dementia and illustrates how this may be heightened by one's culture and racism.

Participatory action research: An exploration from a Freirean perspective of research involving people with dementia

BACKGROUND

Researchers are increasingly being called upon to involve people with dementia in research that pertains to them. Participatory Action Research (PAR) has been one of the approaches that has been utilized to do this. How people understand and apply the ideas behind this approach however has often been atheoretical and diverse. This has implications for how purpose, power, voice and agency are conceived and actualized.

OBJECTIVES

This paper will examine how theoretical construction of PAR can inform the process of meaningfully involving people living with dementia in research. Specifically, drawing on the work of Paulo Freire, this paper will articulate a way of conceptualizing PAR that is explicitly critical and then demonstrate how these ideas informed a PAR study focused on addressing stigma and discrimination with people living with dementia.

CONCLUSION

The purpose of the paper is to engage researchers and people with lived expertise in critical reflection of what it actually means to involve people with dementia in research.

Reflections on an interprofessional student placement initiative in care homes

Interprofessional learning can offer students from different disciplines an opportunity to learn from, with and about each other. Additionally, practice placements in care home settings can offer students a rich learning experience. In 2021, a pilot interprofessional student placement initiative in care homes took place in the Manchester area, with three care homes and 17 students from a range of health and social care disciplines. In this article, the members of the core operational group that implemented the initiative reflect on their experiences. Using the 'What? So what? Now what?' reflective framework, they describe the context of the initiative, explore the lessons learned and make recommendations for future initiatives. The authors' intention is to inspire other educators to consider offering interprofessional placements to students, recognise the value of care homes as placement settings, and acknowledge the benefits of using reflection-in-action and reflective frameworks in healthcare education and practice.

Portable HEPA filtration successfully augments natural-ventilation-mediated airborne particle clearance in a legacy design hospital ward

As the severe acute respiratory syndrome coronavirus-2 pandemic has proceeded, ventilation has been recognized increasingly as an important tool in infection control. Many hospitals in Ireland and the UK do not have mechanical ventilation and depend on natural ventilation. The effectiveness of natural ventilation varies with atmospheric conditions and building design. In a challenge test of a legacy design ward, this study showed that portable air filtration significantly increased the clearance of pollutant aerosols of respirable size compared with natural ventilation, and reduced spatial variation in particle persistence. A combination of natural ventilation and portable air filtration is significantly more effective for particle clearance than either intervention alone.

FLIPPING STIGMA ON ITS EAR: A TOOLKIT FROM PARTICIPATORY ACTION RESEARCH

People living with dementia face persistent stigma, discrimination and social exclusion, with significant emotional, physical and social consequences. Addressing this requires changing attitudes and fostering actions for communities to include people with dementia as citizens with agency and self-determination. This presentation highlights the work of an Action Group (AG) of people living with dementia. As part of a four-year Participatory Action Research study aimed at addressing the stigma, discrimination and social exclusion that is so common to the dementia experience, members of the AG in partnership with the research team developed the Flipping Stigma on its Ear Toolkit. Focus will be on the action-oriented nature of this research project, an overview of the toolkit, and exploration of the communal space that was created by AG members in the process of working together, learning from one another, and making a collective contribution towards addressing stigma, discrimination and social exclusion.

Functional network properties derived from wide-field calcium imaging differ with wakefulness and across cell type

To improve 'bench-to-bedside' translation, it is integral that knowledge flows bidirectionally-from animal models to humans, and vice versa. This requires common analytical frameworks, as well as open software and data sharing practices. We share a new pipeline (and test dataset) for the preprocessing of wide-field optical fluorescence imaging data-an emerging mode applicable in animal models-as well as results from a functional connectivity and graph theory analysis inspired by recent work in the human neuroimaging field. The approach is demonstrated using a dataset comprised of two test-cases: (1) data from animals imaged during awake and anesthetized conditions with excitatory neurons labeled, and (2) data from awake animals with different genetically encoded fluorescent labels that target either excitatory neurons or inhibitory interneuron subtypes. Both seed-based connectivity and graph theory measures (global efficiency, transitivity, modularity, and characteristic path-length) are shown to be useful in quantifying differences between wakefulness states and cell populations. Wakefulness state and cell type show widespread effects on canonical network connectivity with variable frequency band dependence. Differences between excitatory neurons and inhibitory interneurons are observed, with somatostatin expressing inhibitory interneurons emerging as notably dissimilar from parvalbumin and vasoactive polypeptide expressing cells. In sum, we demonstrate that our pipeline can be used to examine brain state and cell-type differences in mesoscale imaging data, aiding translational neuroscience efforts. In line with open science practices, we freely release the pipeline and data to encourage other efforts in the community.

53 The association between maternal preconception BMI and child zBMI growth rates

Background

Elevated body mass index (BMI) and rapid growth in early childhood are important predictors of obesity risk. While studies have identified an association between maternal preconception BMI and child BMI z-scores (zBMI), the association with zBMI growth rates during distinct growth periods is unclear.

Objectives

To assess the association between maternal preconception BMI and child zBMI growth rates and BMI z-scores, in children aged 0 to 10 years old. Additionally, to examine whether child sex and gestational weight gain (GWG) modify these associations.

Design/Methods

This longitudinal study consisted of healthy children (0 to 10 years) enrolled in a primary care practice-based research cohort. The exposure was maternal BMI measured during the preconception period, defined as the 2 years prior to pregnancy. The primary outcome was child zBMI growth, modeled with piecewise linear splines for age. The secondary outcome was repeated measures of child BMI z-scores. Piecewise linear mixed models were used to determine the association with growth, while linear mixed models were used for zBMI. Effect modification by child sex and GWG was explored.

Results

499 children were included. Maternal preconception BMI had a small, but statistically significant association with child zBMI growth rates during some growth periods, with the strongest association from 0 to 4 months (0.007; p=0.004). Maternal preconception BMI was also associated with child zBMI; 1kg/m² increase was associated with 0.03 zBMI increase (p=0.001). Child sex and maternal GWG did not modify these associations.

Conclusion

There is evidence to suggest an association between maternal preconception BMI and child zBMI growth and scores. In addition to maternal and pregnancy benefits, preconception interventions may have longer-term benefits for child growth.

“I didn’t know it was going to be like this.”: End of Life Care Experiences of Care Aides Care in Long-term Care.. [DOI: 10.21203/rs.3.rs-1881436/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0]

Background: Care aides provide upwards of 90% of the direct care for residents in long-term care (LTC) and thus hold great potential in improving residents’ quality of life and end-of-life (EoL) care experiences. Although the scope and necessity of the care aide role is predicted to increase in the future, there is a lack of understanding around their perceptions and experiences of delivering EoL care in LTC settings.Methods: Data were collected over ten months of fieldwork at one long-term care home in western Canada; semi-structured interviews (70 hours) with 31 care aides; and naturalistic observation (170 hours). Data were analysed using Reflexive Thematic Analysis.Results: Three themes were identified: (i) the lack of training and preparedness for the role of EoL care; (ii) the emotional toll that delivering this care takes on the care aids and; (iii) the need for healing and support among this workforce. Findings show that the vast majority of care aides reported feeling unprepared for the delivery of the complex care work required for good EoL care. Findings indicate that there are not adequate resources available for care aides’ to support the mental and emotional aspect of their role in the delivery of EoL care in LTC. Participants shared unique stories of their own self-care traditions to support their grief, processing and emotional healing. Conclusions: The care aides’ role in LTC is of increasing importance, especially in relation to the ageing population and the delivery of EoL care. To facilitate the health and wellbeing of this essential workforce, care aides need to have appropriate training and preparation for the complex care work required for good EoL care. It is essential that mechanisms in LTC become mandatory to support care aides' mental health and emotional wellbeing in this role.

Conceptualizing citizenship in dementia: A scoping review of the literature

Citizenship has provided an important conceptual framework in dementia research and practice over the past fifteen years. To date, there has been no attempt to synthesize the multiple perspectives that have arisen in this literature. The purpose of this paper is to explore, reflect on, and contrast, the key concepts and trends in the citizenship discourse as it relates to people with dementia. Using a scoping review methodology, forty-nine articles were identified for review. Despite the use of different descriptors, thematic analysis revealed four core themes underpinning citizenship discourse: 1) the relationality of citizenship; 2) facilitated agency and autonomy; 3) attention to stigma, discrimination and exclusion; and 4) recognition of the possibilities of identity and growth. Overall, this scoping review found a major emphasis on expanding definitions of agency and autonomy to render citizenship unconditional and inclusive of the diverse life experiences of people living with dementia. Notably, there is recognition that a more intersectional lens for embedding the subjective experience within a broader socio-political context is needed. Whilst the adoption of a citizenship lens in dementia research and practice has had real-world implications for policy and research, its exploration and use continue to be led by academics, highlighting the importance that future research involve input form people with dementia.

Emergency assistance in situations of abuse, neglect, and self-neglect: exploring the complexity and challenges

Health and social care professionals are often called upon to provide emergency intervention without the adult's consent in situations of abuse, neglect, and self-neglect. Little is known about this process despite implications related to health care costs and individual rights. In this qualitative study, 17 health care professionals with experience enacting emergency legislation in BC were interviewed to better understand what leads to an emergency response and how these professionals carry out their role. Five components emerged in the provision of emergency assistance: assessing intolerable risks, assessing incapability, balancing ethical values, exploring resources, and consulting/collaborating. Attention is drawn to the significance of social location, including age, socio-economic, and Indigenous background for influencing the process, sometimes in unintended ways. The challenges in providing emergency interventions may result in social inequities and delay in providing care at times. The importance of bringing a reflexive and intersectional lens to providing interventions is highlighted.

Addressing Stigma in the Community: A Rights-Based Approach to Community-Building

Article 12 of the United Nations Convention of Rights of Persons with Disabilities (CRPD) affirms the rights of persons with physical and mental disabilities to be treated as equal, and deserving of state support to realize their full human potential. This focus on a ‘positive’ right to support (as opposed to the ‘negative’ right to non-interference) has established an important set of expectations around societal responses to people living with dementia(PLWD). This presentation examines the contributions of a rights-based approach to build community with and for PLWD. Data is drawn from Participatory Action Research (PAR) and bi-weekly online action groups with N=10 PLWD in urban and rural British Columbia. Two thematic targets were identified. First, it is important to bring together PLWD in ways that create a sense of solidarity and inclusion. Second, fostering community requires addressing the stigma and discrimination which often leave PLWD feeling isolated, excluded, and marginalized.

The relationship between ultrasound microcalcifications and psammoma bodies in thyroid tumours: a single-institution retrospective study

AIM

To investigate the diagnostic accuracy of ultrasound microcalcifications for the detection of malignancy in thyroid nodules and determine the validity of the concept that ultrasound microcalcification reflects the presence of psammoma body calcification in thyroid nodules.

MATERIALS AND METHODS

The laboratory information system at University Hospital Galway, a tertiary referral hospital, was used to compile a list of patients who underwent thyroid lobectomy or complete thyroidectomy over a continuous 12-month period with both preoperative ultrasound and postoperative histology available (n=106) from January to December 2019. The haematoxylin and eosin-stained histology slides of each case were sourced and reviewed under light microscopy by a histopathologist to determine the presence of psammoma body calcification within both benign and malignant thyroid nodules. Two radiologists reviewed preoperative thyroid ultrasound images of each case independently and blindly, and reported on the presence of ultrasonographic microcalcification.

RESULTS

There was a strong and significant relationship between the presence of preoperative ultrasound microcalcification and thyroid malignancy (p<0.001). Ultrasound microcalcification had a high specificity (93%) and positive predictive value (75%) for thyroid malignancy, with a diagnostic accuracy of 76%. Negative predictive value was high at 76.7%, while sensitivity was low at 42.8%. There was a strong and significant association between the presence of preoperative ultrasound microcalcification in thyroid nodules and the presence of pathological psammoma bodies on histology (p<0.001).

DISCUSSION

Ultrasound microcalcification has a strong and significant association with malignancy in thyroid nodules. This study supported the theory that ultrasound microcalcification occurs secondary to the presence of psammoma bodies within thyroid nodules.

'I wouldn't choose this work again': Perspectives and experiences of care aides in long-term residential care

AIMS

To provide insight into the everyday realities facing care aides working in long-term residential care (LTRC), and how they perceive their role in society.

DESIGN

A qualitative ethnographic case study.

METHODS

Data were collected over. 10 months of fieldwork at one LTRC setting [September 2015 to June 2016] in Western Canada; semi-structured interviews (70 h) with 31 care aides; and naturalistic observation (170 h). Data were analysed using reflexive thematic analysis.

RESULTS

The findings in this work highlight the underpinned ageism of society, the gendered work of body care, and the tension between the need for relational connections - which requires time and economic profit. Four themes were identified, each relating to the lack of training, support, and appreciation care aides felt about their role in LTRC.

CONCLUSION

Care aides remain an unsupported workforce that is essential to the provision of high-quality care in LTRC. To support the care aide role, suggestions include: (i) regulate and improve care aide training; (ii) strengthen care aides autonomy of their care delivery; and (iii) reduce stigma by increasing awareness of the care aide role.

IMPACT

What problem did the study address? The unsupportive working conditions care aides experience in LTRC and the subsequent poor quality of care often seen delivered in LTRC settings. What were the main findings? Although care aides express strong affection for the residents they care for, they experience insurmountable systemic and institutional barriers preventing them from delivering care. Where and on whom will the research have impact? Care aides, care aide educators, care aide supervisors and managers in LTRC, retirement communities, and home care settings.

Use of Expressed Breastmilk at Two Weeks Postpartum Is Associated With Early Cessation and Non-exclusive Breastmilk Feeding for Six Months in a Cohort of Vulnerable Women

Objectives

Pumping and feeding expressed breastmilk (EBM) in the early postpartum period are common but may not support longer-term breastfeeding outcomes. Our objectives were to examine in a cohort of vulnerable mothers of term-born infants: i) the prevalence of EBM feeding; and ii) associations between EBM use at two weeks and any and exclusive breastmilk feeding over the first six months postpartum.

Methods

We pooled data from two studies conducted with participants (n = 316) at three Toronto sites implementing the Canada Prenatal Nutrition Program, an initiative targeting vulnerable families. Socio-demographic data were collected prenatally or at two weeks postpartum. Household food insecurity was assessed at six months using the Canadian Community Health Survey module. A standardized questionnaire was administered prospectively at two weeks and two, four and six months postpartum to collect data on infant feeding practices in the previous two weeks. Descriptive statistics and logistic regression analyses were performed.

Results

The mean age of participants was 32 years, 91% were born outside Canada and 38% had lived in Canada less than three years. Nearly half (44%) reported household food insecurity. All participants initiated breastfeeding and 34% reported EBM use at two weeks postpartum. This declined to 24% at two months, 14% at four months and 8% at six months postpartum. Over the six-month follow-up period, 20% discontinued any breastmilk feeding and only 16% practiced exclusive breastmilk feeding. In adjusted models, EBM use at two weeks was associated with breastmilk feeding cessation (OR 2.75; 95% CI: 1.4–5.2) and non-exclusive breastmilk feeding for six months postpartum (OR 4.32; 95% CI 1.8–10.5).

Conclusions

EBM use in the first two weeks was a predictor of early cessation and non-exclusive breastmilk feeding for six months postpartum in our cohort of vulnerable women living in an urban Canadian context and accessing prenatal nutrition programs. Further research is needed to determine whether early EBM use is a marker for breastfeeding difficulties or undermines longer-term breastfeeding outcomes.

Funding Sources

Canadian Institutes of Health Research; The Sprott Foundation: Joannah and Brian Lawson Centre for Child Nutrition.

Family care across diverse cultures: Re-envisioning using a transnational lens

In an increasingly globalized world, the importance of developing a more culturally complex understanding of family care has been clearly identified. This study explored family care across three different cultural groups - Chinese, South Asian, and Latin American - living in a metropolitan, Pacific-West, Canadian city. In-depth qualitative interviews were conducted with 29 family members from one of the three family groups exploring how they practiced 'care' for their aging, often frail, relatives. The importance of conceptualizing family care as a transnational, collective undertaking emerged from the outset as critical for understanding care practices in all three cultural communities. Three themes identified contributed to this conceptualization: the need to broaden the understanding of family care; the centrality of geographic mobility, and the need to rethink the location of aging and consider its relationship to mobility; and the use of technology by extended family networks to facilitate continuity and connection. An over-riding notion of 'flow' or fluid movement, rather than a fixed, static arrangement, emerged as critical for understanding family care. This perspective challenges the dominant approach to studying family care in gerontology that generally conceptualizes family care practice as one local primary caregiver, often female, with some support from other family members. Understanding family care from a transnational lens builds support for the importance of a feminist Ethics of Care lens and has important implications for policy and service delivery practices.

Older age and comorbidity are independent mortality predictors in a large cohort of 1305 COVID-19 patients in Michigan, United States

INTRODUCTION

Higher comorbidity and older age have been reported as correlates of poor outcomes in COVID-19 patients worldwide; however, US data are scarce. We evaluated mortality predictors of COVID-19 in a large cohort of hospitalized patients in the United States.

DESIGN

Retrospective, multicenter cohort of inpatients diagnosed with COVID-19 by RT-PCR from 1 March to 17 April 2020 was performed, and outcome data evaluated from 1 March to 17 April 2020. Measures included demographics, comorbidities, clinical presentation, laboratory values and imaging on admission. Primary outcome was mortality. Secondary outcomes included length of stay, time to death and development of acute kidney injury in the first 48-h.

RESULTS

The 1305 patients were hospitalized during the evaluation period. Mean age was 61.0 ± 16.3, 53.8% were male and 66.1% African American. Mean BMI was 33.2 ± 8.8 kg m^-2 . Median Charlson Comorbidity Index (CCI) was 2 (1-4), and 72.6% of patients had at least one comorbidity, with hypertension (56.2%) and diabetes mellitus (30.1%) being the most prevalent. ACE-I/ARB use and NSAIDs use were widely prevalent (43.3% and 35.7%, respectively). Mortality occurred in 200 (15.3%) of patients with median time of 10 (6-14) days. Age > 60 (aOR: 1.93, 95% CI: 1.26-2.94) and CCI > 3 (aOR: 2.71, 95% CI: 1.85-3.97) were independently associated with mortality by multivariate analyses. NSAIDs and ACE-I/ARB use had no significant effects on renal failure in the first 48 h.

CONCLUSION

Advanced age and an increasing number of comorbidities are independent predictors of in-hospital mortality for COVID-19 patients. NSAIDs and ACE-I/ARB use prior to admission is not associated with renal failure or increased mortality.

Folate and Synthetic Folic Acid Content in Canadian Fortified Foods 20 Years Post Mandatory Fortification (P24-029-19)

Objectives

In 1998, Health Canada mandated folic acid fortification of white flour and enriched grain products to reduce the prevalence of neural tube defects. In 2009, we reported that the analyzed folate content of 95 of the mostly commonly purchased folic acid fortified foods in Canada was on average 151 ± 16% of that reported in the Canadian Nutrient File (CNF). The aim of this study was to assess whether 20 years after mandatory fortification, the CNF values for folate and folic acid accurately reflect amounts determined by direct assessment.

Methods

Using the 2007 ACNielsen Company data 15 of the most commonly purchased folic acid-fortified foods from each of the following categories were selected: “breads”, “rolls and buns”, “cookies” and “crackers”. Folate concentrations in foods were determined using the tri-enzyme digestion method followed by a microbiological assay. Synthetic folic acid concentrations were determined using stable-isotope liquid chromatography-mass spectrometry. Analyzed values were compared to the 2015 Canadian Nutrient File; unbranded foods.

Results

Our preliminary data show the total folate content analyzed in foods (n = 24 to date) was significantly higher than the CNF values across all categories (P < 0.01) and on average, 187% ± 15 of the CNF values. Similarly, the synthetic folic acid content in foods was significantly higher than CNF values for “rolls and buns” and “cookies” (P < 0.05, P < 0.01 respectively) and on average 163% ± 25 of the CNF values.

Conclusions

These preliminary data suggest, 20 years after mandatory fortification of the food supply, CNF values which include unbranded foods do not accurately represent the amounts of total folate and synthetic folic acid in foods. Hence dietary estimates established using the CNF many significantly underestimate actual intakes due to continued overages in folic acid fortification.

Funding Sources

Natural Sciences and Engineering Research Council of Canada.

Maternal Body Mass Index and Breastmilk Energy, Fat, and Protein Content: A Systematic Review and Regression Analysis of Simulated Data (OR30-06-19)

Objectives

Given increased incidence of maternal postpartum obesity and limited understanding of the degree to which maternal body composition is related to energy and macronutrient content of breastmilk, we conducted a systematic review to assess the associations between maternal body mass index (BMI) and breastmilk energy, fat, and/or total protein content.

Methods

A protocol was registered prior to the completion of this systematic review (PROSPERO 2018 CRD42018098808). The electronic databases MEDLINE, Embase, CINAHL, and Web of Science were searched. The three outcomes of interest were breastmilk energy (kcal/dL), fat (g/dL), and total protein (g/dL) from mothers of term-born infants. Articles that reported maternal BMI or weight and height, collected breastmilk, and measured energy, fat, or protein concentration in breastmilk one to six months postpartum were eligible. If breastmilk was collected at multiple timepoints, the measures closest to three months postpartum were used. A simulated dataset was generated in Stata 14 based on respective sample sizes and means and variance of maternal BMI and breastmilk energy, fat, and protein content of the included studies, assuming normality of each of these variables based on the literature. Linear regressions were performed to examine associations between maternal BMI (kg/m2) and breastmilk energy and individual macronutrients.

Results

A total of 2,012 articles were identified from the search and reference lists of included studies. After full-text screening by two reviewers, 39 articles were included with breastmilk samples from 2,837 mothers. Based on the simulated data, maternal BMI was not significantly associated with breastmilk energy concentration (β = −0.0044, 95% CI [−0.14, 0.14], P > 0.9). However, BMI was positively associated with breastmilk fat concentration (β = 0.015, 95% CI [0.0022, 0.027] P = 0.02) and was negatively associated with total protein concentration (β = −0.0068, 95% CI [−0.011, −0.0027], P = 0.001). Thus, every 1 kg/m2 increase in BMI is associated with a 0.0022 g/dL increase in fat and a 0.011 g/dL decrease in total protein concentration.

Conclusions

Statistically significant associations were found between maternal BMI and breastmilk fat and protein content. However, the effect size was small suggesting that these differences may not be clinically meaningful.

Funding Sources

N/A.

Supporting Tables, Images and/or Graphs

Abstract PD7-01: Bromodomain protein 3 is a novel therapeutic target in invasive lobular carcinoma

Invasive lobular carcinoma (ILC) is a subtype of breast cancer comprising 10% of breast tumours. ILC is characterised by a loss of E-cadherin, and is generally estrogen receptor (ER) positive. The majority of ILC breast cancers are treated with endocrine therapy, although approximately one in three women are de novo resistant to therapy. To identify novel therapeutic targets for the treatment of ILC, we carried out RNA sequencing on 61 primary ILC samples. We found that high expression of the epigenetic reader, bromodomain protein 3 (BRD3) was associated with poor recurrence free survival. We also validated this finding in a separate cohort of 99 ILC patient samples using the METABRIC cohort. Next, we assessed ILC cell lines for sensitivity to JQ1, an inhibitor of BET family proteins. We found that JQ1 inhibited cell growth in all the cell lines tested. Interesting, two of the ILC cell lines were sensitive to JQ1-induced apoptosis, whereas two of the cell lines were inherently resistant to JQ1-induced apoptosis. Using dynamic BH3 profiling we showed that the JQ1 resistant cell lines were dependent on anti-apoptotic protein BCL-XL following JQ1 treatment. Interestingly, we show both in 2D and 3D cultures that JQ1 is synergistic when combined with the BH3 mimetic, ABT-263. Highlighting that combination treatment with JQ1 and ABT-263 may be a novel potential therapeutic option for ILC.

To unveil the mechanism underlying resistance to JQ1-induced apoptosis, we performed paired-end RNA sequencing and compared differentially expressed genes in JQ1 sensitive and JQ1 resistant ILC cell lines. DAVID gene ontology analysis identified 6 pathways differentially upregulated in the JQ1 resistant ILC cell line including MAPK, Wnt, and insulin resistance signaling. Interestingly, we found that ILC cell lines, which were resistant to BET inhibition with JQ1, demonstrated high levels of FGFR1-4 both at the mRNA level and the protein level. Combination treatment with JQ1 and the FGFR1 inhibitor PD173074 or following knockdown of FGFR with siRNA, resulted in increased cell death in JQ1 resistant cells. Currently, we are assessing how FGFR signaling enables survival of ILC cells following JQ1 treatment and determining the exact function of BRD3 in ILC. In conclusion, we have identified a novel therapeutic target, BRD3, which may be inhibited using JQ1 in combination with BH3 mimetic ABT-263 or FGFR1 inhibitor for a more effective treatment strategy for ILC.

Citation Format: Haley K, Walsh L, Moran B, Das S, Tarrant F, Caldas C, Bernards R, Gallagher W, O'Connor D, Ni Chonghaile T. Bromodomain protein 3 is a novel therapeutic target in invasive lobular carcinoma [abstract]. In: Proceedings of the 2018 San Antonio Breast Cancer Symposium; 2018 Dec 4-8; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2019;79(4 Suppl):Abstract nr PD7-01.

Comparing two asthma diagnoses using a prospective cohort of young children

IntroductionAsthma is the most common chronic illness of childhood and places a large burden on the health care system. Asthma prevalence is commonly measured in national surveys by questionnaire. In Ontario, the Ontario Asthma Surveillance Information System (OASIS) developed a validated health claims diagnosis algorithm using health administrative data. Objectives and ApproachThe primary objective of this study was to measure the agreement between the health claims diagnosis algorithm (OASIS diagnosis algorithm) and questionnaire diagnosis (TARGet Kids! diagnosis) of asthma in children younger than 6 years of age. Secondary objectives were to identify concordant and discordant pairs, and to identify factors associated with disagreement. A comparison study including 3368 children participating in the TARGet Kids! practice based research network between 2008 and 2013 in Toronto, Canada. OASIS diagnosis algorithm and TARGet Kids! diagnosis asthma cases were compared using kappa statistic, sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV). ResultsPrevalence of asthma was estimated to be 15% by the OASIS diagnosis algorithm and 7% by TARGet Kids! diagnosis. The Kappa statistic was 0.47 (95% CI: 0.42 – 0.51), sensitivity 82\%, specificity 90%, PPV 38% and NPV 98% for OASIS diagnosis algorithm using TARGet Kids! diagnosis as the criterion standard. There were 3011 concordant pairs (2820 true negatives and 191 true positives) and 357 discordant pairs (315 false positives and 42 false negatives). Statistically significant factors associated with false positives included: male sex, higher zBMI and history of allergy. No statistically significant factors associated with false negatives were identified. Conclusion/ImplicationsOASIS diagnosis algorithm had high sensitivity, specificity, and NPV but low PPV relative to TARGet Kids! diagnosis of asthma. Although, the OASIS diagnosis may identify more asthma cases in young children, its diagnostic properties are similar in older children and it may be a useful tool for longitudinal asthma surveillance.

25-hydroxyvitamin D and health service utilization for asthma in early childhood

IntroductionAsthma is the most common chronic illness of childhood and a common reason for hospital admission. Studies suggest that low vitamin D levels may be associated with health service utilization (HSU) for childhood asthma. Objectives and ApproachThe primary objective was to determine if vitamin D serum levels in early childhood were associated with HSU for asthma including: a) total HSU, b) hospital admissions, c) emergency department visits and d) outpatient sick visits. Secondary objectives were to determine whether vitamin D supplementation in pregnancy or childhood were associated with HSU for asthma. Prospective cohort study of children participating in the TARGet Kids! practice based research network. HSU was determined by linking each child's provincial health insurance number to health administrative databases. Multivariable quasi Poisson and logistic regression were used to evaluate the associations. Results2926 healthy children ages 0-6 years had 25-hydroxyvitamin D data available and were included in the primary analysis. Mean (IQR) 25-hydroxyvitmain D level was 84 nmol/L (65-98 nmol/L), 218 and 1267 children had 25-hydroxyvitamin D levels <50 nmol/L and <75 nmol/L, respectively. In the adjusted models, there were no associations between 25-hydroxyvitamin D (continuously or dichotomized at 50 and 75 nmol/L), vitamin D supplementation in pregnancy or childhood and HSU for asthma. Conclusion/ImplicationsHigher vitamin D blood values do not appear to be associated with HSU for asthma in this population of healthy urban children.

Boomer Matters: Responding to Emotional Health Needs in an Aging Society

This study explores baby boomer-aged adults' experiences accessing an emotional health program (EHP) in a community-based seniors' center, examining differences between it and an older cohort of users. Data generation includes client-based surveys (n=118), in-depth qualitative interviews (n=20) with client users and professionally-trained counselors (n=2), and a focus group with peer support service worker (n=14). Key findings suggest EHPs as a preventative strategy to address familial abuse, the need for education and support on sexual health and dating, and the need to combat ageism to improve access. Community-based seniors' centers as a cost-effective approach to health promotion is also highlighted.

Walking in the neighbourhood: Performing social citizenship in dementia

The proliferation of community-based activity programs for people with dementia suggests an appetite for new approaches to support quality of life and well-being for this population. Such groups also have potential to promote social citizenship, although this remains poorly understood. This article presents findings from a subset of data from an ethnographic study of a community-based program for people with young onset dementia; it focuses on Paul's Club and the experiences of 12-15 members who are physically healthy, with moderate to moderately severe dementia. Analysis suggests how aspects of social citizenship are constructed and revealed through the Club's everyday practice of walking in the neighbourhood. Three major themes emerged: Keeping the focus off dementia; Creating a place of belonging; and Claiming a place in the community How the group balances consideration of members' vulnerability and agency is discussed, and the article concludes with implications for future practice and research initiatives.

Gene expression profiles are different in venous and capillary blood: Implications for vaccine studies

BACKGROUND

Detailed analysis of the immunological pathways leading to robust vaccine responses has become possible with the application of systems biology, including transcriptomic analysis. Venous blood is usually obtained for such studies but others have obtained capillary blood (e.g. finger-prick). Capillary samples are practically advantageous, especially in children.

METHODS

The aim of this study was to compare gene expression profiles in venous and capillary blood before, 12h and 24h after vaccination with 23-valent pneumococcal polysaccharide or trivalent inactivated seasonal influenza vaccines.

RESULTS

Gene expression at baseline was markedly different between venous and capillary samples, with 4940 genes differentially expressed, and followed a different pattern of changes after vaccination. At baseline, multiple pathways were upregulated in venous compared to capillary blood, including transforming growth factor-beta receptor signalling and toll-like receptor cascades. After vaccination with the influenza vaccine, there was enrichment for T and NK cell related signatures in capillary blood, and monocyte signatures in venous blood. By contrast, after vaccination with the pneumococcal vaccination, there was enrichment of dendritic cells, monocytes and interferon related signatures in capillary blood, whilst at 24h there was enrichment for T and NK cell related signatures in venous blood.

CONCLUSIONS

These data show differences between venous and capillary gene expression both at baseline, and post vaccination, which may impact on the conclusions regarding immunological mechanisms drawn from studies using these different sampling methodologies.

The Relationship between Milk Fat Content, Vitamin D and Adiposity in Early Childhood

BACKGROUND: Fortified cow’s milk is the main dietary source of vitamin D and an important source of dietary fat for North American children. Current guidelines recommend reduced milk fat consumption to reduce childhood obesity, yet the relationship between lower milk fat, vitamin D stores and adiposity is unclear.

OBJECTIVES: The objective of this study was to determine the association between percent fat content of milk and both zBMI and 25-hydroxyvi-tamin D; secondly, to explore if volume of milk consumed modified this relationship.

DESIGN/METHODS: A cross-sectional study of healthy urban children 12-72 months of age was conducted. Bivariate multiple linear regression was used to test the association between percent milk fat content and child 25-hydroxyvitamin D and zBMI concurrently. The interaction between volume of milk consumed and percent milk fat content was examined to explore how milk volume might modify these relationships.

RESULTS: 2745 children were included in the analysis. Percent fat content of milk was positively associated with 25-hydroxyvitamin D (p=0.006), and negatively associated with zBMI (p&lt;0.0001). Children who drank homogenized milk (3.25% fat) had 6.6 nmol/L (95% CI 5.49 to 7.71) higher median 25(OH)D concentration and 0.72 lower (95% CI 0.68 to 0.76) zBMI score than children who drank skim milk (0.1% fat). Volume of milk consumed potentiated the effect of percent fat content of milk on 25-hydroxyvitamin D (p=0.003) but not on zBMI (p=0.77). Children who drank 1 cup of homogenized milk each day had a similar 25-hydroxyvita-min D as children who drank 2.85 cups (95% CI 2.71 to 2.99) of skim milk, but had zBMI score 0.78 (95% CI 0.63, 0.93) units lower.

CONCLUSION: Homogenized milk may be more appropriate than reduced fat milk in maximizing serum 25-hydroxyvitamin D and minimizing adiposity in early childhood. Current guidelines for reduced milk fat consumption in childhood may require further study to achieve desired outcomes.