Abstract
In this mixed methods study, a survey and in-depth interviews were used to explore whether decision regret and the psychological impact of receiving genome sequencing (GS) results differed between parents and patients, and between those who received a genetic diagnosis and those who did not. Participants (nā=ā77) completed a survey that included the Decisional Regret Scale (DRS) and an adaptation of the Multidimensional Impact of Cancer Risk Assessment (MICRA) at least 12 months after consenting for GS for rare disease diagnosis in the 100,000 Genomes Project. Survey participants were invited to take part in an interview and 39 agreed; 12 with a diagnosis, 5 with variants of uncertain significance, and 19 with no pathogenic findings identified. Both survey and interview findings indicated that decision regret was low. DRS scores revealed no differences in levels of regret between parents and patients, or between those with a diagnosis and those without. Though MICRA scores indicated minimal evidence of negative psychological impacts of receiving GS results, subscale analysis revealed greater distress and uncertainty for parents compared to patients. Receiving a diagnosis was found not to influence MICRA scores, supporting interview findings of both positive and negative emotional and psychological impacts irrespective of a genetic diagnosis. Our findings have implications for policy and practice as GS is integrated into the UK and worldwide; notably, that expectation-setting is critical when offering GS, and that post-test counselling is important regardless of the GS result received, with parents perhaps needing additional emotional support.
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Introduction
Genomic tests such as genome sequencing (GS) and exome sequencing (ES) are increasingly being used in clinical settings to aid the diagnosis of rare and inherited diseases in children and adults. The potential benefits of genomic testing include increased knowledge, modifications to medications, procedures or treatment options, improved long-term clinical management, a clearer prognosis, information about recurrence risk and risks for other family members, as well as opportunities to obtain tailored information and support [1,2,3]. Not all individuals having GS will receive a diagnosis and some findings will reveal a variant of uncertain significance (VUS). However, it is anticipated that diagnostic yields from ES and GS will continue to increase as our knowledge grows [4]. The 100,000 Genomes Project (100kGP) was a hybrid clinical and research project designed to prepare for the implementation of GS in the National Health Service (NHS). Patients with cancer or selected rare and inherited diseases, and parents and relatives of these patients were enrolled in the 100kGP between 2015 and 2018 and consented to receive main findings from GS, to contribute their data for research, and had the option to receive clinically actionable āadditional health-related findingsā [5]. Most of the research around participant experiences of the 100kGP has focused on motivations for uptake and the consent processes [6,7,8,9]. However, to inform both policy and clinical genetics practice as GS is introduced into routine care in the UK, we need insight into participantsā experiences of receiving GS results.
Several studies have reported limited psychological harms for adult patients and parents following the receipt of genomic test results [10,11,12,13,14,15]. For example, a recent exploratory meta-analysis of psychological outcomes related to result disclosure at seven sites offering ES/GS found that, in general, these results did not lead to negative psychological effects, and that there were no observable differences in psychological outcomes between participants with and without a diagnosis [10]. The authors did, however, note while negative emotions and distress were generally infrequent, there was variability with somewhat greater distress at the sites that included paediatric populations. In addition, several studies have found that there can be negative psychological outcomes, particularly for parents of children offered ES or GS for rare disease diagnosis [16,17,18,19]. For those parents that receive a diagnostic result, this can result in relief but also worry, fear, loss of hope, frustration at a lack of information and disappointment if management isĀ not altered [16,17,18,19]. Parents who do not receive a diagnostic result have also been found to experience negative psychological outcomes including frustration and disappointment at the remaining uncertainty [16, 19]. In addition, decision regret (DR) has been observed in parent cohorts. InĀ a survey study by Wynn et al. [17], around 20% of parents expressed some regret over the decision to have testing (irrespective of the test result), and parents who interpreted their child as receiving a diagnostic result, experienced more negative psychological outcomes than those parents who did not, highlighting the complexity of psychological outcomes for this particular cohort.
If there are differences across particular groups (e.g., parents vs. patients or those with a diagnostic result vs. those without a diagnostic result), then this will help professionals to better understand the perspectives of adult patients and parents and have important implications for counselling and support following result disclosure. To build on the prior research, and to examine explicitly the experience of participants taking part in the 100kGP who include both parents and adult patients, we conducted a mixed methods study involving surveys and interviews at two timepoints: time of testing (T1) and 12ā18 months later (T2). In this manuscript, we report on DR and the psychological impact of GS results identified from the T2 survey and interviews. Our research questions were: (1) Does DR and the psychological impact of receiving a GS result differ between parents and patients? (2) Does DR and the psychological impact of receiving GS results differ between those who received a genetic diagnosis and those who did not.
Methods
Mixed methods design
Our overarching mixed methods study design [20] comprised cross-sectional surveys distributed to 100kGP participants at two timepoints (time of testing (T1) and 12ā18 months later (T2)) followed by in-depth interviews with a subset of survey respondents. Working within a pragmatist paradigm (a worldview that focuses on āwhat worksā rather than what might be considered absolutely and objectively ātrueā or ārealā [21]), we drew on both qualitative and quantitative assumptions to investigate different facets of the same phenomena (ācomplementarityā). Quantitative data collection and analysis preceded qualitative data collection and analysis, and both the quantitative and qualitative components were given equal status. Data were analysed separately and integrated at the final stage in order to answer the research questions (composite analysis) [22].
Development of the T2 survey and interview topic guides
Surveys and interview topic guides were developed by SCS and CL, with input from the wider study team and members of the advisory group (seeĀ Supplementary materials). The survey was designed to assess attitudes, knowledge, decision making and the impact of receiving GS results. Survey findings reported here are DR, measured using the Decisional Regret Scale (DRS) [23], and the psychological impact of receiving GS results, measured using an adapted version of the Multidimensional Impact of Cancer Risk Assessment (MICRA) [24]. We used 17 items: 1ā12; 14, 15 (addition of the word, ānegativelyā); 16; 21 and added an item (13; āBeing uncertain about what the result means for the management of my relativeās rare conditionā.).
The interview topic guide included: motivations for participating in the 100kGP, decision making, communication of results, experience of receiving GS results, and understanding and impact of GS results. Interview findings reported here relate to DR and impact of GS results.
Participants and recruitment
Participants were recruited from six London hospitals that were part of two Genomic Medicine Centres involved in recruiting probands and their relatives into the 100kGP. Participants included: (a) adult patients with a genetically undiagnosed rare disease, (b) parents of children with a genetically undiagnosed rare disease and, (c) relatives of patients with a genetically undiagnosed rare disease undergoing GS to help identify the gene variant causing the probandās condition. Dyads from a single family were eligible. Approximately 12 months after completing the T1 survey (conducted between 1 July 2017 and 30 September 2018), respondents (nā=ā504) were invited to complete either a paper or online version of the T2 survey via SurveyMonkey. Respondents who reported receiving a GS result, which could be a diagnostic result, a VUS result or a no primary finding result, were invited to take part in an interview.
Data analysis
Quantitative surveys
Only survey data from respondents who reported receiving a GS result (nā=ā77) were analysed. All analyses were conducted using R 4.0.2 [25]. To answer our research questions, we investigated the relationship between participant type (parent/patient) and diagnosis status (genetic diagnosis/no genetic diagnosis) on our outcome variables: DR and psychological impact. We considered those with a VUS result as having received no genetic diagnosis. Since the residuals of the DRS scores deviated from normality even after transformation, scores were classified into three categories that have been used elsewhere in the literature [26] where 0 = no regret; 5ā25 = mild regret; and ā„30 = moderate to high regret. Ļ2 tests of independence were used to assess associations between regret and our two variables. For MICRA scores (for which the residuals were approximately normally distributed), we performed multiple regression with bootstrapped simulations (Rā=ā1000) in which 95% confidence intervals and p values for the model estimates were obtained. As neither DRS nor MICRA scores were the primary outcomes for the survey, a priori power calculations to find subgroup differences were not performed.
Qualitative interviews
Interviews were conducted by four researchers (CL, JH, MP, MH) and transcribed verbatim. Data were analysed following the principles of codebook thematic analysis [27]. An initial draft codebook, developed by JH and CL, was informed by the aims of the study (deductive component). These two researchers then read and independently coded three transcripts, adding codes not covered by the original codebook (inductive component). Additional codes were discussed and the resulting revised codebook was used to code the remaining transcripts. NVivo 12 (QSR International, Australia) was used to group codes into thematic categories which were then refined during discussions between JH, MP, CL, and MH. To facilitate comparisons between participant sub-groups (i.e., parents and patients/participants with and without a diagnosis), illustrative quotes from each participant were charted in a matrix against themes relevant to the research questions.
Quantitative measures
Decisional Regret Scale (DRS)
Participants provide ratings on a 5-point Likert scale (1 = strongly agree, 5 = strongly disagree) for five items regarding their DR. Items two and four are reverse coded so that, for each item, a higher number indicates greater regret. Scores are converted to a 0ā100 scale and can range from 0 (no regret) to 100 (high regret). Cronbachās alpha revealed good internal consistency (Ī±ā=ā0.82).
Multidimensional Impact of Cancer Risk Assessment (MICRA)
Participants provide ratings on a 4-point scale (Never = 0, Rarely = 1, Sometimes = 3, Often = 5). Seventeen items were taken from the original 25-item MICRA and comprise three subscales: Distress, Uncertainty, and Positive Experiences. Scores for this adapted version could range from 0 (no impact) to 85 (high impact). Cronbachās alpha revealed good internal consistency across the whole scale (Ī±ā=ā0.82) and for each subscale (Distress: Ī±ā=ā0.85; Uncertainty: Ī±ā=ā0.88; Positive experiences: Ī±ā=ā0.87).
Results
Participant characteristics
Of the 296 unique T2 surveys received (58.7% response rate), 77 participants (26%) reported receiving a GS result (seeĀ Supplementary materials for participant characteristics), and were invited to interviews: 39 (50.6%) agreed (27 did not respond, 10 declined, and one could not be reached by phone). One participant was excluded as their results were not received through the 100kGP. Interview participants included two parent couples. Interviews lasted between 17:50 and 61:01āmin (median = 31:06āmin); 27 were conducted by telephone and 11 by video call.
Survey results
Decision regret
Of the 73 participants who provided data for this assessment, 32 were patients and 41 were parents. However, 16 parents comprised eight dyads. To avoid associations between paired data, DRS scores from one parent in each dyad was excluded through random selection. Across all participants (nā=ā65), the mean DRS score was 10.31 (SDā=ā12.12, range = 0ā50) and the median score was 5 (IQ1ā=ā0, IQ3ā=ā20) which, given the total maximum possible score of 100, shows that DR was low (TableĀ 1). Viewing the data in terms of the discrete categories corroborated this finding and showed that few people (nā=ā6; 9%) had high levels of regret (seeĀ Supplementary materials). In answer to our research questions, Ļ2 tests revealed no association between DR and participant type [Ļ2 (2, nā=ā65) = 2.03, pā=ā0.36] or between DR and diagnosis status [Ļ2 (2, nā=ā65) = 1.23, pā=ā0.54] indicating that regret did not differ between parents and patients or between those with a diagnosis and those without.
Impact of receiving results from GS
Of the 71 participants who provided data, 31 were patients and 40 were parents. Fourteen of these parents comprised seven dyads so, in the same way as above, MICRA scores from one parent in each dyad were excluded. Across all participants (nā=ā64), the mean score (collapsed across subscales) was 17.22 (SDā=ā14.71, range = 0ā63) and the median was 14 (IQ1ā=ā5.75, IQ3ā=ā26) which, given the maximum possible score of 85, indicates low negative psychological impact. For each of the following subscales, a multiple regression was performed with subscale score as the outcome variable and participant type and diagnosis status as the independent variables (see TableĀ 2 for descriptive statistics).
Distress
Results showed that parents reported higher levels of distress than patients (Ī²ā=ā2.87, [1.4, 4.32], SEā=ā0.74, pā<ā0.001) but that distress did not differ significantly for those with a diagnosis compared to those without (Ī²ā=āā0.31 [ā1.68, 1.08], SEā=ā0.70, pā=ā0.662).
Uncertainty
Analysis revealed differences by participant type: uncertainty was higher for parents than patients (Ī²ā=ā2.65, [0.52, 4.72], SEā=ā1.07, pā=ā0.013). Uncertainty did not differ, however, between those with and without a diagnosis (Ī²ā=āā0.27 [ā2.53, 2.09], SEā=ā1.18, pā=ā0.821).
Positive experiences
Results indicated that positive experiences did not differ between parents and patients (Ī²ā=āā0.13, [ā1.0, 0.70], SEā=ā0.43, pā=ā0.770), nor between those with a diagnosis and those without (Ī²ā=ā0.85 [ā0.12, 1.82], SEā=ā0.50, pā=ā0.087).
Interview results
Decision regret? I would do it again tomorrow
All participants were emphatic that they had no regrets about their decision to have GS, regardless of the result they received or whether they were parents or patients (TableĀ 3: Q1 and Q2). For parents and patients who had undergone multiple investigations prior to the 100kGP or who had been living with their condition for years, having GS was simply another testing option to get answers to long-standing questions about their health. For many participants, lack of regret was tied to being grateful for the opportunity to take part in the 100kGP with altruistic reasons playing a key role. Participants reported finding it rewarding to take part in something that could help others and benefit medical research. While no participants stated that they regretted taking part in the 100kGP or having GS, some were ambivalent. For example, one participant commented; āI wanted to take part mainly because of my interest in these things. But it wouldnāt have made any difference to me if I hadnātā (P1āPatientāno genetic cause found).
āAs soon as you say he has got a diagnosis, they want to help youā: practical and social benefits of GS
The value of a label
Many living with no diagnosis described the challenge of explaining the condition to others. For instance, one parent, whose child was overweight, described how a genetic diagnosis would have made it easier to explain to school staff and social services that his increased appetite was related to his condition, and not because he was being overfed (TableĀ 3: Q3). For these participants, the social and practical value of having a genetic diagnosis was evident. One patient described how receiving a diagnosis had now made it easier to explain his neurological condition to his family. Others talked about how having a diagnosis now entitled their child to certain services and financial support (TableĀ 3: Q4). There was, however, little practical or social impact for those who received a no primary finding resultāparticularly those who did not perceive themselves to be seriously unwell (TableĀ 3: Q5).
Behavioural changes for both probands and relatives
Behavioural impacts, such as changes to diet or lifestyle, were reported by some. Some reported the result also led to behavioural changes for other family members. One patient described how her sons ātend to use sunscreenā and ālook after themselves a bit betterā since learning about her genetic diagnosis for a hereditary condition that predisposes her to skin cancers.
Clinical care remained largely unchanged
In a handful of cases, receiving a diagnosis had a direct impact on clinical care; four parents and one patient described how having a diagnosis allowed closer monitoring of family members (TableĀ 3: Q6). Receiving a VUS could also lead to changes, such as being seen by a specialist team or being included in clinical research (TableĀ 3: Q7). However, most reported that clinical care remained āabsolutely the sameā regardless of whether a genetic cause had been identified (TableĀ 3: Q8). This was particularly so for those who had been living with a clinical diagnosis for many years (such as lipoedema or polycystic kidney disease) and were being medically managed accordingly (TableĀ 3: Q9).
āIt was just nice to have confirmationā: relief in many forms
Relief and reassurance
Relief and reassurance after receiving a result were commonly described emotions and were reported more often by those for whom a genetic cause had been found, and more often by parents than patients. For example, one parent who received a diagnosis for her sonās developmental delay, talked about feeling relieved āto know that there is something thereā, whilst another described relief that her worries about her sonās eye condition were justified.
Relief from guilt and self-blame
A diagnosis could also provide relief from guilt. One patient described how his diagnosis had let him ātake any self-blame out of itā. Similarly, one parent described how the diagnosis had alleviated her guilt that lifestyle choices during her pregnancy had caused her childās condition (TableĀ 3: Q10).
Relief when conditions are ruled out
Relief was also experienced in the context of being able to rule out conditions. One parent described relief that a particular genetic variant had not caused her daughterās kidney condition. For others, it was the lack of a genetic diagnosis that provided reassurance that there was a low risk of passing the condition on (TableĀ 3: Q11).
Disappointment, uncertainty, frustration, and sadness
āI wasnāt expecting miracles, I just wasnāt expecting nothingā: disappointment and sadness when reality does not live up to expectations
In most cases, more negative emotions, like disappointment and sadness, were experienced by those with aĀ no primary finding result, with parents expressing these feelings more often than patients. Often, the source of this disappointment could be attributed to a mismatch between peopleās expectations of receiving a diagnosis and their actual results. Whilst some had tried to be āopen-mindedā, it was clear that many parents had pinned their hopes on finding a genetic cause. One couple, for instance, who had put āhope in the technologyā of GS, described grief and sadness at their result not providing details about the heritability of their sonās incredibly rare neurological condition (TableĀ 3: Q12). Notably, sadness was not limited to those who did not receive a diagnosis. One parent described how the reality that there was, in fact, a genetic cause for her childās rare condition had left her feeling upset (TableĀ 3: Q13).
Feeling uninformed left some people frustrated
For a few participants, frustration was evident: one parent described searching for information online because he felt that the health professional had not provided enough details about his VUS result (TableĀ 3: Q14), whilst a patient with a no primary finding result was frustrated at the lack of access to his genetic information (TableĀ 3: Q15).
Living with uncertainty: anxiety about the future
Some parents who did not have a genetic diagnosis for their child talked about feeling anxious, even frightened for the future. Concern for the health of other family members was also an issue for several participants who had aĀ no primary finding result (TableĀ 3: Q16). There was also evidence of anxiety when a VUS was found, manifesting for one parent as an āextra kind of layer of vigilanceā of their childās condition. One parent described the uncertainty following a VUS as āquite difficult to live withā and another was anxious about the implications for siblings (TableĀ 3: Q17). Interestingly, participants with a diagnosis could also feel anxiety about an uncertain future that was linked to the prognosis of the diagnosed condition (TableĀ 3: Q18) or the possibility of passing the gene on (TableĀ 3: Q19).
Feeling alone despite receiving a diagnosis
Two parents reported feelings of isolation when a very rare disease was diagnosed. One parent felt unsure about where to turn after the diagnosis because the condition was so rare, whilst the other parent felt isolated and worried at the prospect of clinicians having never seen her childās condition before.
Discussion
Our mixed methods study examined participantsā experiences of receiving GS results in the 100kGP. We found that DR was low and, in general, there was minimal negative psychological impact of receiving a GS result. An important distinction, however, is that levels of distress and feelings of uncertainty were higher for parents than for patients. In line with the survey results, in which psychological impact was similar for those with and without a diagnosis, the interviews further highlighted that a wide range of individual social, practical, behavioural and emotional impacts are evident regardless of whether a genetic diagnosis is obtained. Similar findings have been noted in other studies exploring the impact of genetic test results on parents of children with rare and undiagnosed diseases [16, 18].
In keeping with other research exploring experiences of GS [17, 28], both our quantitative and qualitative findings indicated that DR was low. Notably, this did not differ across parent and patient groups and was the case whether or not participants had received a genetic diagnosis. The interviews suggest that low DR was frequently linked to altruistic intentions of benefiting research and others. As GS shifts from being offered as part of a research project to being offered more widely in routine clinical care, it will be important to assess whether DR continues to be low, regardless of setting.
Interviews with participants revealed there to be positive psychosocial impacts of GS results. In line with other qualitative studies [28, 29], relief was evident following receipt of a genetic diagnosis, particularly for parents. The power of having a diagnosis for legitimising the condition and bringing about a sense of validation was also seen. For those who had been struggling with the uncertainty of not having a diagnosis, being able to attribute a cause for their or their childās condition could be helpful practically by facilitating access to specialist equipmentĀ and educational and social support. It could also be helpful psychologically and emotionally, providing additional confidence when speaking to both medical professionals and family members. Comparable descriptions of empowerment from obtaining a genetic diagnosis have been described elsewhere [30] and research has supported the value of empowerment as a mechanism not only for driving patientsā healthcare choices [31], but also for coping with the condition on a day-to-day basis [32]. Our findings, therefore, provide further support for the notion that receiving a diagnosis can be instrumental in equipping patients and parents with the tools to play an active role in their own or their childās healthcare and, where relevant, their social and educational needs.
In terms of the negative emotional impact of receiving a GS result, our survey findings showed them to be minimal and not to differ between those with and without a diagnosis. This is in keeping with a recent meta-analysis [10] and other work showing no significant increase in distress or uncertainty amongst participants who have elected to receive genetic research results [33]. Our interviews, however, clearly show individual variation in experiences and suggest that, for some participants, there were negative experiences associated with GS result disclosure. For those with aĀ no primary finding or a VUS result, frustration and disappointment were described, mirroring findings from other studies exploring the return of GS results [16, 18, 19, 34], and can be viewed as being inextricably linked with the uncertainty of living with an undiagnosed condition [35]. Similar to findings reported by Donohue et al. [19], we also noted that disappointment was greater if initial expectations of receiving a diagnostic result were elevated and that, even in cases where a diagnosis was found, sadness and isolation, linked to the rareness of the condition, were experienced.
Our findings have significant implications. First, they demonstrate the importance of providing patients with realistic expectations during pre-test counselling about the possible implications of GS. Second, they show that assumptions about what support is needed should not be made on the basis of the GS result; receiving a genetic diagnosis does not negate emotions like uncertainty and anxiety and professionals should take this into consideration during post-test conversations. Third, from a methodological perspective, the contrast between the minimal harms identified in the survey (which capture a snapshot of an experience) and the negative emotions expressed in our interviews (which provide scope for deep exploration) highlights the importance of integrating quantitative with qualitative findings for building a comprehensive view of peopleās experiences.
Another finding, significant to our research questions was that, whilst our survey results indicated low testing-related distress overall, levels of distress and uncertainty were significantly higher for parents than patients. This was reflected in our interviews where the negative reactions to receiving a GS result were conveyed more viscerally by parents. Such findings could be attributed to variation in perceived quality of life, with patients who have lived with their condition for many years having a different perspective to parents who do not know how the condition will unfold for their child. Another possibility is that parents may invest greater hope in the potential life-changing outcomes of these types of genetic tests and, therefore, experience disheartenment when these expectations are not realised [36, 37]. Taken together, and in line with recent work highlighting the grief-like emotions that parents report after their childās diagnosis of a rare genetic condition and the important role for emotional support after testing [38], insights from our study make clear the importance of providing care that is adaptable to individual psychological needs.
Strengths and limitations
Integration of the quantitative and qualitative findings has strengthened the validity of the findings and given a richer understanding of peopleās experiences. Furthermore, the research was conducted at multiple hospital sites, increasing the generalisability of the findings. A key limitation, however, was the small proportion of participants who reported receiving a result at the time the survey was administered and respondent bias which may have been towards self-selected participants with strong feelings about GS or those more inclined to engage with the research team. Finally, as this is a cross-sectional study, responses can only give a snapshot experience at a given time.
Conclusions
With the expanding use of GS in clinical care, achieving a faster final diagnosis for people with rare conditions is frequently highlighted as a key priority [39]. Whilst this is without doubt an important goal, our research highlights that policymakers and healthcare providers also need to put in place appropriate measures that consider the potential variation in the emotional and psychological needs of patients receiving GS results regardless of the type of result. Lessons for policy and practice for delivering GS in the future are timely as genomic medicine matures within mainstream care in the NHS. As such, further research with patients and families undergoing GS in the NHS Genomic Medicine Service will be important.
Data availability
The datasets generated and analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This research was funded by the National Institute for Health Research (NIHR) under the Research for Patient Benefit funding stream (PB-PG-1014-35016: A study to define patient priorities and preferences when consenting to genome sequencing to ensure informed choice). The research was also funded by the NIHR Great Ormond Street Hospital (GOSH) Biomedical Research Centre (BRC) and was made possible through access to patients being recruited to the 100kGP in the North Thames Genomic Medicine Centre. The 100kGP is managed by Genomics England Limited (a wholly owned company of the Department of Health), funded by the NIHR and NHS England, and uses data provided by patients and collected by the NHS. CL is funded through an NIHR Advanced Fellowship Grant (NIHR300099). Thanks go to Sarah Wynn for her helpful comments on this version of the paper.
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CL and LSC conceived the study. CL, LSC and SCS designed the study. JH, MP, SCS, JG, MH and CL were responsible for data acquisition. MP, JH, MH and CL were responsible for drafting the manuscript, data analysis, and data interpretation. AH, BS and CP were members of the advisory team who provided feedback on study design, research materials, and findings. All authors contributed to revision of the manuscript and approve the final manuscript.
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CP is employed by Genomics England, a UK Department of Health and Social Care owned company. The remaining authors declare no conflicts of interest.
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Ethical approval was obtained from the NHS Research Ethics Committee West Midlands (15/WM/0258).
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Peter, M., Hammond, J., Sanderson, S.C. et al. Participant experiences of genome sequencing for rare diseases in the 100,000 Genomes Project: a mixed methods study. Eur J Hum Genet 30, 604ā610 (2022). https://doi.org/10.1038/s41431-022-01065-2
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DOI: https://doi.org/10.1038/s41431-022-01065-2
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