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2.
Clin Oncol (R Coll Radiol) ; 36(5): 300-306, 2024 05.
Article in English | MEDLINE | ID: mdl-38388251

ABSTRACT

AIMS: Squamous cell carcinoma oral cavity cancers (SCCOCCs) have a higher reported incidence in South Asian countries. We sought to compare presenting stage and outcome by ethnicity in patients with SCCOCC treated with radical radiotherapy in a single centre in the UK. MATERIALS AND METHODS: All patients with SCCOCC treated with radical radiotherapy at an oncology department in Leicester (UK) between 2011 and 2017 were identified. Baseline demographic, clinical data and 2-year treatment outcomes were reported. RESULTS: Of the 109 patients included, 40 were South Asian and 59 were non-South Asian. South Asians had significantly poorer 2-year disease-free survival compared with non-South Asians (54.6% versus 73%, P = 0.01). CONCLUSION: Our analysis suggests that South Asians with SCCOCC have poorer outcomes despite a younger age and similar disease characteristics. Environmental, social factors and differing biology of disease may be responsible and further research is required to inform targeted interventions.


Subject(s)
Asian People , Mouth Neoplasms , Humans , Ethnicity , Treatment Outcome , Mouth Neoplasms/ethnology , United Kingdom
3.
Arch Dermatol Res ; 315(9): 2617-2622, 2023 Nov.
Article in English | MEDLINE | ID: mdl-37432466

ABSTRACT

The Harmonising Outcome Measures for Eczema (HOME) initiative established a core outcome set (COS) for atopic eczema (AE) clinical trials in 2019. This set encompasses four core outcome domains and corresponding measurement instruments: clinical signs (EASI), patient-reported symptoms (POEM and NRS 11 point for worst itch over the last 24 h), quality of life (DLQI/CDLQI/IDQoLI), and long-term control (Recap or ADCT). Following its roadmap, the HOME initiative is now focused on supporting implementation of the COS. To identify barriers and facilitators to implementation of the COS, and to guide the effort to promote COS uptake, a virtual consensus meeting was held over 2 days (September 25-26, 2021) attended by 55 participants (26 healthcare professionals, 16 methodologists, 5 patients, 4 industry representatives, and 4 students). Implementation themes were identified by a pre-meeting survey distributed to HOME members, presentations, and whole-group discussion. Participants were divided into five multi-professional small groups which ranked their top 3 most important themes, followed by whole-group discussion and anonymous consensus voting (consensus criteria: < 30% disagreement). Three most important implementation themes were identified and agreed upon: (1) awareness and stakeholder engagement, (2) universal applicability of the COS, and (3) ensuring minimum administrative burden. Working groups to address these issues are now a priority for the HOME initiative. The results from this meeting will inform the development of a HOME Implementation Roadmap in an effort to support other COS groups planning for effective implementation of their core sets.


Subject(s)
Dermatitis, Atopic , Eczema , Humans , Dermatitis, Atopic/therapy , Dermatitis, Atopic/diagnosis , Outcome Assessment, Health Care , Quality of Life , Research Design , Severity of Illness Index , Treatment Outcome , Clinical Trials as Topic
4.
Skin Health Dis ; 1(4): e59, 2021 Dec.
Article in English | MEDLINE | ID: mdl-34514465

ABSTRACT

Background: Eczema can have a considerable impact on quality of life. Treatments can improve this, but management is complex. Barriers to eczema self-management may be impacted upon by environmental context, such as the COVID-19 pandemic. Objectives: To explore experiences of eczema, self-management, and accessing healthcare and advice during the COVID-19 pandemic among young people with eczema and parents/carers of children with eczema. Methods: Qualitative semi-structured interviews were carried out with 36 participants recruited from general practices as part of randomised controlled trials of online eczema resources. Results: Changes to everyday life-Periods of staying at home due to the pandemic alter the burden of eczema, with reports of an improved routine and application of topical treatments for many, but difficulties with handwashing for others. Parents/carers reported improved eczema control due to closures of educational settings. Young people reported higher stress that may have triggered eczema flare-ups. Changes to access to advice and treatment-There was a reluctance to seek medical appointments in a non-emergency situation. Participants reported a lack of trust in the outcome of telephone consultations because health professionals were unable to see or feel the skin. Delays or difficulties when obtaining appointments and treatments caused frustration. Access to an online eczema resource was reported to have extra value in the context of the pandemic. Conclusion: Changes to lifestyle and access to healthcare during the pandemic have affected eczema and self-management. Healthcare settings may want to consider providing extra reassurance around remote consultations.

5.
Gynecol Oncol ; 162(2): 431-439, 2021 08.
Article in English | MEDLINE | ID: mdl-34059348

ABSTRACT

BACKGROUND: Fear of disease progression (FOP) is a rational concern for women with Ovarian Cancer (OC) and depression is also common. To date there have been no randomized trials assessing the impact of psychological intervention on depression and FOP in this patient group. PATIENTS AND METHODS: Patients with primary or recurrent OC who had recently completed chemotherapy were eligible if they scored between 5 and 19 on the PHQ-9 depression and were randomized 1:1 to Intervention (3 standardized CBT-based sessions in the 6-12 weeks post-chemotherapy) or Control (standard of care). PHQ-9, FOP-Q-SF, EORTC QLQ C30 and OV28 questionnaires were then completed every 3 months for up to 2 years. The primary endpoint was change in PHQ-9 at 3 months. Secondary endpoints were change in other scores at 3 months and all scores at later timepoints. RESULTS: 182 patients registered; 107 were randomized; 54 to Intervention and 53 to Control; mean age 59 years; 75 (70%) had completed chemotherapy for primary and 32 (30%) for relapsed OC and 67 patients completed both baseline and 3-month questionnaires. Improvement in PHQ-9 was observed for patients in both study arms at three months compared to baseline but there was no significant difference in change between Intervention and Control. A significant improvement on FOP-Q-SF scores was seen in the Intervention arm, whereas for those in the Control arm FOP-Q-SF scores deteriorated at 3 months (intervention effect = -4.4 (-7.57, -1.22), p-value = 0.008). CONCLUSIONS: CBT-based psychological support provided after chemotherapy did not significantly alter the spontaneously improving trajectory of depression scores at three months but caused a significant improvement in FOP. Our findings call for the routine implementation of FOP support for ovarian cancer patients.


Subject(s)
Antineoplastic Agents/therapeutic use , Cognitive Behavioral Therapy/methods , Depression/therapy , Fear/psychology , Ovarian Neoplasms/rehabilitation , Aged , Depression/diagnosis , Depression/etiology , Depression/psychology , Disease Progression , Female , Follow-Up Studies , Humans , Middle Aged , Neoplasm Recurrence, Local , Ovarian Neoplasms/drug therapy , Ovarian Neoplasms/psychology , Patient Health Questionnaire/statistics & numerical data , Pilot Projects , Prospective Studies , Quality of Life , Standard of Care , Treatment Outcome
6.
Br J Dermatol ; 185(5): 921-934, 2021 11.
Article in English | MEDLINE | ID: mdl-34050935

ABSTRACT

BACKGROUND: Although hidradenitis suppurativa (HS) is known to affect quality of life, little summative knowledge exists on how HS impacts people living with the condition. OBJECTIVES: To synthesize experiences of people with HS within published qualitative research. METHODS: Searches on databases MEDLINE, PsycINFO, Embase and CINAHL were conducted on 17 April 2020. Two independent reviewers screened 5512 publications. Study quality was assessed using the National Institute for Health and Care Excellence quality appraisal checklist for qualitative studies. Thematic synthesis generated descriptive and analytic themes. RESULTS: Fourteen studies were included: four studies fulfilled most quality criteria, eight fulfilled some quality criteria, and two fulfilled few quality criteria. There were three final themes. (i) Putting the brakes on life. The physical, psychological and social consequences of HS resulted in people missing out on multiple life events. This could have a cumulative effect that influences the trajectory of someone's life. (ii) A stigmatized identity: concealed and revealed. People try to conceal their HS, visually and verbally, but this results in anticipation and fear of exposure. Social support and psychological acceptance helped people cope. Connecting to others with HS may have a specific role in preserving a positive self-identity. (iii) Falling through the cracks. Delayed diagnosis, misdiagnosis and lack of access to care were reported. People felt unheard and misunderstood by healthcare professionals, and healthcare interactions could enhance feelings of shame. CONCLUSIONS: There need to be improvements to clinical care to allow people with HS to live their life more fully.


Subject(s)
Hidradenitis Suppurativa , Adaptation, Psychological , Humans , Qualitative Research , Quality of Life , Social Support
7.
J Eur Acad Dermatol Venereol ; 35(10): 1987-1993, 2021 Oct.
Article in English | MEDLINE | ID: mdl-33977561

ABSTRACT

Atopic eczema (herein referred to as 'eczema') is a skin disease characterized by remitting and relapsing symptoms. The Harmonising Outcome Measures for Eczema (HOME) initiative was developed to establish a core outcome set (COS) for eczema to be measured for all future eczema trials. The core outcome set for atopic eczema clinical trials includes the domain for patient-reported eczema control, but a review of the validation of available eczema control instruments was lacking. We aimed to review the literature and systematically assess the measurement properties of validated patient-reported outcome instruments that capture eczema control. PubMed and Ovid EMBASE were searched up to 24 January 2020 for any study that reported on PROM instrument development or validation. The COnsensus-based Standards for the selection of health Measurement Instruments (COSMIN) criteria were used to assess the quality of eligible studies. We screened 12 036 titles and abstracts and 58 full texts. A total of 12 papers were included, reporting on seven PROMS. These were assessed with respect to development, reliability, construct validity and responsiveness. Two instruments, Recap of Atopic Eczema (RECAP) and the Atopic Dermatitis Control Tool (ADCT), have been developed and validated to a sufficient standard to support their recommendation as patient-reported outcome instruments for measuring control of atopic eczema as part of the HOME Core Outcome Set.


Subject(s)
Dermatitis, Atopic , Eczema , Humans , Patient Reported Outcome Measures , Quality of Life , Reproducibility of Results
8.
Br J Dermatol ; 185(1): 139-146, 2021 07.
Article in English | MEDLINE | ID: mdl-33393074

ABSTRACT

BACKGROUND: The Harmonising Outcome Measures for Eczema (HOME) initiative has established a core outcome set of domains for atopic eczema (AE) clinical trials. Previous consensus meetings have agreed on preferred instruments for clinician-reported signs (Eczema Area and Severity Index, EASI) and patient-reported symptoms (Patient-Oriented Eczema Measure, POEM). This paper reports consensus decisions from the HOME VII meeting. OBJECTIVES: To complete the core outcome set for AE by agreeing on core outcome instruments for the domains of quality of life (QoL), long-term control and itch intensity. METHODS: A face-to-face consensus meeting was held in Tokyo, Japan (8-10 April 2019) including 75 participants (49 healthcare professionals/methodologists, 14 patients, 12 industry representatives) from 16 countries. Consensus decisions were made by presentations of evidence, followed by whole and small group discussions and anonymous voting using predefined consensus rules. RESULTS: It was agreed by consensus that QoL should be measured using the Dermatology Life Quality Index (DLQI) for adults, the Children's Dermatology Life Quality Index (CDLQI) for children and the Infant's Dermatology Quality of Life Index (IDQoL) for infants. For long-term control, the Recap of Atopic Eczema (RECAP) instrument or the Atopic Dermatitis Control Test (ADCT) should be used. Consensus was not reached over the frequency of data collection for long-term control. The peak itch numerical rating scale (NRS)-11 past 24 h was recommended as an additional instrument for the symptom domain in trials of older children and adults. Agreement was reached that all core outcome instruments should be captured at baseline and at the time of primary outcome assessment as a minimum. CONCLUSIONS: For now, the core outcome set for clinical trials in AE is complete. The specified domains and instruments should be used in all new clinical trials and systematic reviews of eczema treatments.


Subject(s)
Dermatitis, Atopic , Eczema , Adolescent , Adult , Child , Consensus , Dermatitis, Atopic/therapy , Eczema/therapy , Humans , Infant , Japan , Outcome Assessment, Health Care , Quality of Life , Severity of Illness Index
9.
Skin Health Dis ; 1(3): e42, 2021 Sep.
Article in English | MEDLINE | ID: mdl-35663143

ABSTRACT

Background: The Patient-Oriented Eczema Measure (POEM) is the core outcome instrument recommended for measuring patient-reported atopic eczema symptoms in clinical trials. To ensure that the statistical significance of clinical trial results is meaningful, trials are often designed by specifying the target difference in the primary outcome as part of the sample size calculation. One method used to specify the target difference is a score that corresponds to a standardized effect size. Objectives: to assess how the standardized effect size of POEM scores vary across age, gender, ethnicity and disease severity. Methods: This study combined data from five UK-based randomized clinical trials of eczema treatments in order to assess differences in self-reported eczema symptoms (POEM) corresponding to a standardized effect size (0.5 SD of baseline POEM scores) across age, gender, ethnicity and disease severity. Results: POEM scores corresponding to 0.5 SD(baseline) were remarkably consistent across participants of varying ages, gender, ethnicity and disease severity from datasets of five UK trials in children (range 2.99-3.45). Conclusions: This study provides information that can support those designing clinical trials to determine their sample size and can aid individuals interpreting trial results. Further exploration of differences in populations beyond the United Kingdom is needed.

10.
Br J Dermatol ; 2020 Nov 11.
Article in English | MEDLINE | ID: mdl-33179283

ABSTRACT

BACKGROUND: The Harmonising Outcome Measures for Eczema (HOME) initiative has established a core outcome set of domains for atopic eczema clinical trials. Previous consensus meetings have agreed upon preferred instruments for clinician-reported signs (Eczema Area and Severity Index - EASI) and patient-reported symptoms (Patient-Oriented Eczema Measure - POEM). This paper reports consensus decisions from the HOME VII meeting. OBJECTIVE: To complete the core outcome set for atopic eczema by agreeing upon core outcome instruments for the domains of quality of life, long-term control and itch intensity. METHODS: Face-to-face consensus meeting held in Tokyo, Japan (8th to 10th April, 2019) including 74 participants (47 healthcare professionals/methodologists, 14 patients, 13 industry representatives), from 16 countries. Consensus decisions were made by presentations of evidence, followed by whole and small group discussions and anonymous voting using pre-defined consensus rules. RESULTS: It was agreed by consensus that quality of life should be measured using the Dermatology Life Quality Index (DLQI) for adults, the Children's Dermatology Life Quality Index (CDLQI) for children, and the Infant's Dermatology Quality of Life Index (IDQoL) for infants. For long-term control, the Recap of Atopic Eczema (RECAP) instrument or the Atopic Dermatitis Control Test (ADCT) should be used. Consensus was not reached over the frequency of data collection for long-term control. The peak itch numerical rating scale(NRS)-11 past 24 hours was recommended as an additional instrument for the symptom domain in trials of older children and adults. Agreement was reached that all core outcome instruments should be captured at baseline and at the time of primary outcome assessment as a minimum. CONCLUSIONS: For now, the core outcome set for clinical trials in atopic eczema is complete. The specified domains and instruments should be used in all new clinical trials and systematic reviews of eczema treatments.

11.
Br Dent J ; 229(7): 399, 2020 10.
Article in English | MEDLINE | ID: mdl-33037337
12.
Br J Dermatol ; 183(3): 524-536, 2020 09.
Article in English | MEDLINE | ID: mdl-31794074

ABSTRACT

BACKGROUND: Eczema control has been identified as an important outcome by key stakeholders in eczema research (including patients, carers, healthcare professionals and researchers) but no validated instruments for the domain have been identified. OBJECTIVES: To develop a measurement instrument to capture a patient's perspective of eczema control that is suitable for use in eczema clinical trials. METHODS: Best practice for the development of a patient-reported outcome was followed. A mixed-methods approach was used to develop and refine a conceptual framework, generate, refine and select items and to test the distribution and construct validity of the final scale. The mixed-methods approach involved expert panel meetings (including patient representatives, healthcare professionals and methodologists), and data collection using a focus group, cognitive interviews and an online survey with people with eczema and caregivers. Multivariable linear regression was used in the item selection process. RESULTS: Fourteen expert panel members co-produced the instrument, with input from people with eczema and caregivers via a focus group (n = 6), cognitive interviews (n = 13) and an online survey (n = 330). The resulting instrument, Recap of atopic eczema (RECAP), is a seven-item questionnaire that captures eczema control via self or caregiver report. The development process aimed to ensure good content validity and feasibility. Initial testing suggested no floor or ceiling effects and good construct validity. Hypothesized correlation with the Patient-Oriented Eczema Measure was confirmed [r(258) = 0·83, P < 0·001]. CONCLUSIONS: RECAP has the potential to improve reporting of eczema control in research and clinical practice. Further exploration of measurement properties is required. Linked Comment: Pattinson and Bundy. Br J Dermatol 2020; 183:418-419. What's already known about this topic? Eczema control has been identified as an important outcome by key stakeholders in eczema research (including patients, carers, healthcare professionals and researchers). Qualitative studies suggest eczema control is a multifaceted and individual experience and no instrument has been identified that captures eczema control in this way. What does this study add? We have developed Recap of atopic eczema (RECAP), a seven-item questionnaire to capture the experience of eczema control in all ages and eczema severities; there are two versions: a self-reported version for adults and older children with eczema, and a caregiver-reported version for younger children with eczema. Designed with input from people with eczema, caregivers and healthcare professionals to ensure good content validity. Initial testing of score distributions and construct validity suggests good measurement properties. What are the clinical implications of the work? The RECAP instrument is appropriate and feasible for measuring eczema control in clinical trials and may also be useful in routine practice.


Subject(s)
Dermatitis, Atopic , Eczema , Adolescent , Adult , Caregivers , Child , Dermatitis, Atopic/prevention & control , Eczema/prevention & control , Humans , Patient Reported Outcome Measures , Surveys and Questionnaires
13.
Br J Dermatol ; 182(4): 828-829, 2020 04.
Article in English | MEDLINE | ID: mdl-31646617

Subject(s)
Eczema , Humans
14.
J Eur Acad Dermatol Venereol ; 33(6): 1124-1132, 2019 Jun.
Article in English | MEDLINE | ID: mdl-30720903

ABSTRACT

BACKGROUND: Atopic eczema (also known as eczema) is a chronic, inflammatory skin condition that often afflicts patients' health and well-being. The Harmonising Outcome Measures for Eczema (HOME) initiative recommends that 'long-term control of eczema' is measured in all clinical trials 3 months or longer in duration. However, little has been published on what eczema control means to those living with or treating atopic eczema. OBJECTIVES: To (i) develop understanding of what eczema control means to patients, carers and clinicians and (ii) explore the feasibility and acceptability of different ways of measuring eczema control in the long term. METHODS: Online focus groups explored patients/carers experiences in the UK, the United States, the Netherlands, France, Sweden and Japan, and an international online survey gathered views of clinicians. The framework method was used to analyse the focus groups, and thematic analysis was used to analyse survey data. All findings were integrated into a theoretical framework to create overarching themes that cut across these diverse groups. RESULTS: Eight focus groups with patients (16 years+) and eight groups with carers of children took place (N = 97). Sixty-two people took part in the survey. Eczema control was described as a multifaceted construct involving changes in disease activity, the treatment and management of the condition and psychological, social and physical functioning. Patient/carer measurement allows personal accounts and frequent measurement, whilst clinician measurement was deemed less subjective. The burden on patients/carers and issues for analysing and interpreting data should be considered. CONCLUSIONS: This study formed the basis of judging the content validity and feasibility of measurement instruments/methods to assess control of eczema in clinical trials. This online approach to an international qualitative study is an example of how core outcome set developers with limited resources can engage with multiple stakeholder groups on an international basis to inform consensus meeting discussions.


Subject(s)
Dermatitis, Atopic/prevention & control , Eczema/prevention & control , Adolescent , Adult , Child , Female , Focus Groups , Humans , Male , Qualitative Research , Young Adult
15.
Br J Dermatol ; 178(5): e332-e341, 2018 05.
Article in English | MEDLINE | ID: mdl-29672835

ABSTRACT

This is the report from the fifth meeting of the Harmonising Outcome Measures for Eczema initiative (HOME V). The meeting was held on 12-14 June 2017 in Nantes, France, with 81 participants. The main aims of the meeting were (i) to achieve consensus over the definition of the core domain of long-term control and how to measure it and (ii) to prioritize future areas of research for the measurement of the core domain of quality of life (QoL) in children. Moderated whole-group and small-group consensus discussions were informed by presentations of qualitative studies, systematic reviews and validation studies. Small-group allocations were performed a priori to ensure that each group included different stakeholders from a variety of geographical regions. Anonymous whole-group voting was carried out using handheld electronic voting pads according to predefined consensus rules. It was agreed by consensus that the long-term control domain should include signs, symptoms, quality of life and a patient global instrument. The group agreed that itch intensity should be measured when assessing long-term control of eczema in addition to the frequency of itch captured by the symptoms domain. There was no recommendation of an instrument for the core outcome domain of quality of life in children, but existing instruments were assessed for face validity and feasibility, and future work that will facilitate the recommendation of an instrument was agreed upon.


Subject(s)
Dermatitis, Atopic/therapy , Quality of Life , Child , Clinical Trials as Topic , Consensus , Forecasting , Humans , Outcome Assessment, Health Care , Severity of Illness Index
16.
Br J Dermatol ; 178(5): 1135-1142, 2018 05.
Article in English | MEDLINE | ID: mdl-29355894

ABSTRACT

BACKGROUND: The Patient-Oriented Eczema Measure (POEM), scored 0-28, is the core outcome instrument recommended for measuring patient-reported atopic eczema symptoms in clinical trials. To date, two published studies have broadly concurred that the minimally important change (MIC) of the POEM is three points. Further assessment of the MIC of POEM in different populations, and using a variety of methods, will improve interpretability of the POEM in research and clinical practice. OBJECTIVES: To calculate the smallest detectable change in the POEM and estimate the MIC of the POEM using a variety of methods in a trial dataset of children with moderate-to-severe atopic eczema. METHODS: This study used distribution-based and anchor-based methods to calculate the MIC of the POEM in children with moderate-to-severe eczema. RESULTS: Data were collected from 300 children. The smallest detectable change was 2·13. The MIC estimates were 1·07 (using 0·2 SD of baseline POEM scores) and 2·68 (using 0·5 SD of baseline POEM scores) based on distribution-based methods; were 3·09-6·13 based on patient-/parent-reported anchor-based methods; and were 3·23-5·38 based on investigator-reported anchor-based methods. CONCLUSIONS: We recommend the following thresholds be used to interpret changes in POEM scores: ≤ 2, unlikely to be a change beyond measurement error; 2·1-2·9, a small change detected that is likely to be beyond measurement error but may not be clinically important; 3-3·9, probably a clinically important change; ≥ 4, very likely to be a clinically important change.


Subject(s)
Eczema/therapy , Adolescent , Child , Child, Preschool , Clothing , Eczema/psychology , Female , Humans , Infant , Male , Patient Reported Outcome Measures , Silk , Treatment Outcome
18.
Br J Dermatol ; 171(4): 825-31, 2014 Oct.
Article in English | MEDLINE | ID: mdl-24814298

ABSTRACT

BACKGROUND: People with psoriasis report high levels of undermanaged distress. This is compounded by the problem that some patients find it difficult to discuss their emotions. Distress prevents optimal self-management, which may exacerbate psoriasis flares, thereby creating a vicious cycle. OBJECTIVES: To offer people with psoriasis a novel way of expressing their personal models of psoriasis in order to gain a better understanding of their experiences of living with the condition. METHODS: We used a qualitative technique - asking people with psoriasis to complete a postcard entitled 'Dear Psoriasis...' - to collect survey data on their personal models of psoriasis. RESULTS: One hundred and four returned postcards provided new insights into the extent of and reasons for distress in psoriasis. Seven dominant themes emerged: identity and relationships; battleground; control; emotional consequences; hypervigilance; coping; treatment burden. CONCLUSIONS: Reports of distress were common, and for many it was long-standing. Some reported low self-esteem and self-denigration bordering on self-loathing, and described being hypervigilant and in a constant battle with their skin. Many people did not expect to have intimate relationships, resulting in reduced social support for patients in the future. This research underscores the need for patient support and psychological treatment to be made available as part of routine care.


Subject(s)
Psoriasis/psychology , Stress, Psychological/etiology , Adaptation, Psychological , Anxiety/etiology , Attitude to Health , Cost of Illness , Emotions , Health Status , Humans , Interpersonal Relations , Personal Satisfaction , Self Concept , Self Report
20.
J Virol ; 83(23): 12552-8, 2009 Dec.
Article in English | MEDLINE | ID: mdl-19740979

ABSTRACT

The role of blood in the iatrogenic transmission of transmissible spongiform encephalopathy (TSE) or prion disease has become an increasing concern since the reports of variant Creutzfeldt-Jakob disease (vCJD) transmission through blood transfusion from humans with subclinical infection. The development of highly sensitive rapid assays to screen for prion infection in blood is of high priority in order to facilitate the prevention of transmission via blood and blood products. In the present study we show that PrP(sc), a surrogate marker for TSE infection, can be detected in cells isolated from the blood from naturally and experimentally infected sheep by using a rapid ligand-based immunoassay. In sheep with clinical disease, PrP(sc) was detected in the blood of 55% of scrapie agent-infected animals (n = 80) and 71% of animals with bovine spongiform encephalopathy (n = 7). PrP(sc) was also detected several months before the onset of clinical signs in a subset of scrapie agent-infected sheep, followed from 3 months of age to clinical disease. This study confirms that PrP(sc) is associated with the cellular component of blood and can be detected in preclinical sheep by an immunoassay in the absence of in vitro or in vivo amplification.


Subject(s)
Blood Cells/chemistry , Immunoassay/methods , PrPSc Proteins/blood , Scrapie/diagnosis , Animals , Disease Models, Animal , Sheep
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