ABSTRACT
Small RNAs (sRNAs) are essential for normal plant development and range in size classes of 21-24 nucleotides. The 22nt small interfering RNAs (siRNAs) and miRNAs are processed by Dicer-like 2 (DCL2) and DCL1 respectively and can initiate secondary siRNA production from the target transcript. 22nt siRNAs are under-represented due to competition between DCL2 and DCL4, while only a small number of 22nt miRNAs exist. Here we produce abundant 22nt siRNAs and other siRNA size classes using long hairpin RNA (hpRNA) transgenes. By introducing asymmetric bulges into the antisense strand of hpRNA, we shifted the dominant siRNA size class from 21nt of the traditional hpRNA to 22, 23 and 24nt of the asymmetric hpRNAs. The asymmetric hpRNAs effectively silenced a ß-glucuronidase (GUS) reporter transgene and the endogenous ethylene insensitive-2 (EIN2) and chalcone synthase (CHS) genes. Furthermore, plants containing the asymmetric hpRNA transgenes showed increased amounts of 21nt siRNAs downstream of the hpRNA target site compared to plants with the traditional hpRNA transgenes. This indicates that these asymmetric hpRNAs are more effective at inducing secondary siRNA production to amplify silencing signals. The 22nt asymmetric hpRNA constructs enhanced virus resistance in plants compared to the traditional hpRNA constructs.
ABSTRACT
MicroRNA (miRNA) target mimicry technologies, utilizing naturally occurring miRNA decoy molecules, represent a potent tool for analyzing miRNA function. In this study, we present a highly efficient small RNA (sRNA) target mimicry design based on G-U base-paired hairpin RNA (hpG:U), which allows for the simultaneous targeting of multiple sRNAs. The hpG:U constructs consistently generate high amounts of intact, polyadenylated stem-loop (SL) RNA outside the nuclei, in contrast to traditional hairpin RNA designs with canonical base pairing (hpWT), which were predominantly processed resulting in a loop. By incorporating a 460-bp G-U base-paired double-stranded stem and a 312-576 nt loop carrying multiple miRNA target mimicry sites (GUMIC), the hpG:U construct displayed effective repression of three Arabidopsis miRNAs, namely miR165/166, miR157, and miR160, both individually and in combination. Additionally, a GUMIC construct targeting a prominent cluster of siRNAs derived from cucumber mosaic virus (CMV) Y-satellite RNA (Y-Sat) effectively inhibited Y-Sat siRNA-directed silencing of the chlorophyll biosynthetic gene CHLI, thereby reducing the yellowing symptoms in infected Nicotiana plants. Therefore, the G-U base-paired hpRNA, characterized by differential processing compared to traditional hpRNA, acts as an efficient decoy for both miRNAs and siRNAs. This technology holds great potential for sRNA functional analysis and the management of sRNA-mediated diseases.
Subject(s)
Arabidopsis , MicroRNAs , Base Pairing/genetics , Plants, Genetically Modified/genetics , RNA, Small Interfering/genetics , MicroRNAs/genetics , RNA Interference , RNA, Messenger/genetics , RNA, Double-Stranded , Arabidopsis/geneticsABSTRACT
Sepiapterin is an orally administered drug in development for the treatment of phenylketonuria, an inborn error of metabolism characterized by the deficiency of the phenylalanine-metabolizing enzyme phenylalanine hydroxylase. This study characterized the pharmacokinetics, safety, and tolerability of 2 clinical sepiapterin formulations (Phase 1/2, Phase 3) and the effects of food on the pharmacokinetics of the Phase 3 formulation in healthy participants. In Part A, 18 participants were randomized to one of 2 treatment sequences, each with 4 dosing periods comprising a single dose (20 or 60 mg/kg) of the Phase 1/2 or the Phase 3 formulation with a low-fat diet. In Part B, 14 participants were randomized to one of 2 sequences, each comprising 4 dosing periods of a single dose (20 or 60 mg/kg) of the Phase 3 formulation under fed (high-fat) or fasted conditions. Following oral administration, sepiapterin was quickly absorbed and rapidly and extensively converted to tetrahydrobiopterin (BH4). BH4 was the major circulating active moiety. Under low-fat conditions, the Phase 3 formulation was bioequivalent to the Phase 1/2 formulation at 20 mg/kg, while slightly lower BH4 exposure (approximately 0.81×) for the Phase 3 formulation was observed at 60 mg/kg. BH4 exposure increased to approximately 1.7× under the low-fat condition and approximately 2.8× under the high-fat condition at a dose of either 20 or 60 mg/kg for the Phase 3 formulation, compared with the fasted condition. Both sepiapterin formulations were well tolerated, with no serious or severe adverse events reported. All treatment-emergent adverse events were mild or moderate in severity.
Subject(s)
Biological Availability , Biopterins , Biopterins/analogs & derivatives , Cross-Over Studies , Food-Drug Interactions , Healthy Volunteers , Pterins , Humans , Male , Adult , Administration, Oral , Female , Pterins/administration & dosage , Pterins/pharmacokinetics , Pterins/adverse effects , Young Adult , Biopterins/administration & dosage , Biopterins/pharmacokinetics , Biopterins/adverse effects , Middle Aged , Phenylketonurias/drug therapy , Therapeutic Equivalency , Fasting , AdolescentABSTRACT
BACKGROUND: Colorectal cancer is the second leading cause of cancer-related mortality in the UK and a significant contributor to morbidity and mortality worldwide. Early diagnosis provides opportunities for intervention and improved survival. Significant event analysis (SEA) is a well-established quality improvement method for learning from new cancer diagnoses. AIM: To provide additional insights into diagnostic processes for colorectal cancer and to identify areas for improvement in patient care pathways. DESIGN & SETTING: Fifty-three general practices across Pennine Lancashire, England, submitted one or more SEA reports as part of an incentivised scheme. METHOD: A standardised data collection form was used to collate learning points and recommendations for improvements. In total, 161 reports were analysed using an inductive framework analysis approach. RESULTS: There was an overarching theme of building vigilance and collaboration between and within general practices and secondary care. The following four main sub-themes were also identified: education; individualised and flexible care; ownership and continuity; and communication. CONCLUSION: These findings provide additional insights into colorectal cancer pathways from a primary care perspective. Practices should be supported in developing protocols for assessment and follow-up of patients with varying presentations. Screening and access to investigations are paramount for improving early diagnosis; however, a flexible diagnostic approach is required according to the individual circumstances of each patient.
ABSTRACT
The National Confidential Enquiry into Patient Outcome and Death reviewed the quality of care provided to adults who presented to hospital following an epileptic seizure. Clinical and organisational changes are highlighted that aim to improve patient care and outcomes.
Subject(s)
Epilepsy , Seizures , Adult , Humans , Epilepsy/therapy , Hospitals , Seizures/therapyABSTRACT
Co-creating patient-facing educational materials (PEMs) can enhance person-centered care by responding to patient priorities and unmet needs. Little data exist on 'best practices' for co-creation. We followed the Arksey and O'Malley framework to conduct a systematic literature search of nine databases (MEDLINE, PubMed, EMBASE, CINAHL, PsycINFO, Web of Science, Cochrane Library, Joanna Briggs Institute, TRIP-April, 2022) to identify empirical studies published in English on PEM co-creation to distill 'best practices'. Following an independent dual review of articles, data were collated into tables, and thematic analysis was employed to synthesize 'best practices' that were validated by a patient experienced in co-creating PEMs. Bias was not assessed, given the study heterogeneity. Of 6998 retrieved articles, 44 were included for data extraction/synthesis. Studies utilized heterogeneous methods spanning a range of health conditions/populations. Only 5/45 (11%) studies defined co-creation, 14 (32%) used a guiding framework, and 18 (41%) used validated evaluation tools. Six 'best practices' were identified: (1) begin with a review of the literature, (2) utilize a framework to inform the process, (3) involve clinical and patient experts from the beginning, (4) engage diverse perspectives, (5) ensure patients have the final decision, and (6) employ validated evaluation tools. This scoping review highlights the need for clear definitions and validated evaluation measures to guide and assess the co-creation process. Identified 'best practices' are relevant for use with diverse patient populations and health issues to enhance person-centered care.
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Objective: To determine if the Clinical Frailty Scale (CFS) predicts out-of-hospital cardiac arrest (OHCA) outcomes better than age?Design: The analysed data was collected as part of a larger study run by NCEPOD on hospital admissions for OHCA in 2018. Study selection was OHCA in over 16-year-olds with restoration of spontaneous circulation (ROSC) for >20 mins and who were admitted to hospital, or who died in the emergency department. Patients from hospitals in England, Wales and Northern Ireland were identified using standard coding for cardiac arrest. CFS, age and gender were examined against two binary outcomes (non-shockable rhythm and survival). Results: 304 patients with a known CFS, known original rhythm, and known outcome were included. Younger patients had lower CFSs, as a continuous variable (Pearson correlation coefficient 0.44, p-value < 0.001) and in CFS groupings of 1-3, 4-6, 7-9 (p-value < 0.001). CFSs were higher (p-values < 0.001) for both non-shockable rhythm and death (median CFS was 4 for death and 2 for survivors). Logistic regression analysis of continuous scale CFS showed the association with non-shockable rhythm remained when adjusted for age and sex (odds ratio [95% CI]; age adjustment 1.46 [1.28, 1.68] p-value < 0.001) and remained for survival when adjusted for age alone (odds ratio [95% CI]; 1.60 [1.36, 1.88] p-value < 0.001) and when adjusted for age, sex and initial rhythm combined (1.45 [1.21, 1.73] p-value < 0.001). 3.2% of patients had resuscitation against their advanced-care-directives. 12.9% (23/178) of hospitals had electronic systems which shared advance-care-directives with ambulance services and primary care. Conclusion: A higher CFS is a prognostic indicator in adult OHCA independent of age. Frail individuals have a lower likelihood of a shockable rhythm and poorer survival. Sensitive sharing of this information with patients when discussing advance-care-directives may enhance shared decision-making.
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BACKGROUND: Frequent blood phenylalanine (Phe) measurement is required for phenylketonuria (PKU) patients for diagnosis and disease status monitoring. Though various methods are available for blood Phe measurement, there is a lack of validated quantitative methods for measuring Phe with less than 15% variability. A method to allow at home blood sample collection for the PKU community is in high demand. METHODS: A volumetric absorptive microsampling (VAMS) dried blood collection high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) method was developed and fully validated for blood Phe measurement in compliance with regulatory guidances. The method accuracy, precision, stability, selectivity, matrix and hematocrit effects were assessed. A venous plasma collection HPLC-MS/MS method was developed and validated as a reference method. 311 matching VAMS and plasma samples were collected from 24 PKU subjects in a Phase 2 clinical study. Phe measurements using the two methods were compared. RESULTS: Both VAMS and the plasma sample collection methods met the acceptance criteria for Good Laboratory Practice (GLP) bioanalytical analysis. Comparisons showed a high Pearson's correlation of 0.9813. The Passing-Bablok analysis showed that the difference was estimated to be less than 5% and Bland Altman analysis indicated that the difference was proportional with Phe concentration and for the majority of samples (88.85%) the measurement was within ±20% difference. Following 7 days treatment with 60 or 20 mg/kg/day PTC923 (Sepiapterin) or 20 mg/kg/day sapropterin, PKU patients exhibited respectively -206.4, -146.9, and -91.5 µmol/L reductions of blood Phe as measured by the VAMS method. CONCLUSIONS: Concordant results were obtained using VAMS and plasma methods, which demonstrated that VAMS is a reliable method for clinical applications to monitor blood Phe for PKU patients.
Subject(s)
Phenylketonurias , Tandem Mass Spectrometry , Humans , Tandem Mass Spectrometry/methods , Dried Blood Spot Testing/methods , Blood Specimen Collection/methods , Phenylketonurias/diagnosis , PhenylalanineABSTRACT
Recent work has shown potential in using Mixed Integer Programming (MIP) solvers to optimize certain aspects of neural networks (NNs). However the intriguing approach of training NNs with MIP solvers is under-explored. State-of-the-art-methods to train NNs are typically gradient-based and require significant data, computation on GPUs, and extensive hyper-parameter tuning. In contrast, training with MIP solvers does not require GPUs or heavy hyper-parameter tuning, but currently cannot handle anything but small amounts of data. This article builds on recent advances that train binarized NNs using MIP solvers. We go beyond current work by formulating new MIP models which improve training efficiency and which can train the important class of integer-valued neural networks (INNs). We provide two novel methods to further the potential significance of using MIP to train NNs. The first method optimizes the number of neurons in the NN while training. This reduces the need for deciding on network architecture before training. The second method addresses the amount of training data which MIP can feasibly handle: we provide a batch training method that dramatically increases the amount of data that MIP solvers can use to train. We thus provide a promising step towards using much more data than before when training NNs using MIP models. Experimental results on two real-world data-limited datasets demonstrate that our approach strongly outperforms the previous state of the art in training NN with MIP, in terms of accuracy, training time and amount of data. Our methodology is proficient at training NNs when minimal training data is available, and at training with minimal memory requirements-which is potentially valuable for deploying to low-memory devices.
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Background: Delayed puberty in males is almost invariably associated with constitutional delay of growth and puberty (CDGP) or congenital hypogonadotrophic hypogonadism (CHH). Establishing the cause at presentation is challenging, with "red flag" features of CHH commonly overlooked. Thus, several markers have been evaluated in both the basal state or after stimulation e.g. with gonadotrophin releasing hormone agonist (GnRHa).Insulin-like peptide 3 (INSL3) is a constitutive secretory product of Leydig cells and thus a possible candidate marker, but there have been limited data examining its role in distinguishing CDGP from CHH. In this manuscript, we assess INSL3 and inhibin B (INB) in two cohorts: 1. Adolescent boys with delayed puberty due to CDGP or CHH and 2. Adult men, both eugonadal and having CHH. Materials and methods: Retrospective cohort studies of 60 boys with CDGP or CHH, as well as 44 adult men who were either eugonadal or had CHH, in whom INSL3, INB, testosterone and gonadotrophins were measured. Cohort 1: Boys with delayed puberty aged 13-17 years (51 with CDGP and 9 with CHH) who had GnRHa stimulation (subcutaneous triptorelin 100mcg), previously reported with respect to INB. Cohort 2: Adult cohort of 44 men (22 eugonadal men and 22 men with CHH), previously reported with respect to gonadotrophin responses to kisspeptin-54. Results: Median INSL3 was higher in boys with CDGP than CHH (0.35 vs 0.15 ng/ml; p=0.0002). Similarly, in adult men, median INSL3 was higher in eugonadal men than CHH (1.08 vs 0.05 ng/ml; p<0.0001). However, INSL3 more accurately differentiated CHH in adult men than in boys with delayed puberty (auROC with 95% CI in adult men: 100%, 100-100%; boys with delayed puberty: 86.7%, 77.7-95.7%).Median INB was higher in boys with CDGP than CHH (182 vs 59 pg/ml; p<0.0001). Likewise, in adult men, median INB was higher in eugonadal men than CHH (170 vs 36.5 pg/ml; p<0.0001). INB performed better than INSL3 in differentiating CHH in boys with delayed puberty (auROC 98.5%, 95.9-100%), than in adult men (auROC 93.9%, 87.2-100%). Conclusion: INSL3 better identifies CHH in adult men, whereas INB better identifies CHH in boys with delayed puberty.
Subject(s)
Hypogonadism , Insulins , Puberty, Delayed , Male , Adolescent , Humans , Adult , Puberty, Delayed/drug therapy , Retrospective Studies , Hypogonadism/drug therapy , Hypogonadism/congenital , Testosterone , GonadotropinsABSTRACT
BACKGROUND: Rare disease research is hampered in part by the fact that patients are geographically dispersed. Rare disease patient communities are recognized for their use of the internet to learn about their condition and find peer-to-peer support. As such, web-based technologies offer promise for overcoming geographic barriers in rare disease research for many. Qualitative focus groups (FGs) are a widely used methodology used to understand patients and parents/families 'lived experience' and unmet needs is important to improve care for rare diseases. It is unclear if web-enabled (virtual) FGs are comparable to traditional in-person approaches. We conducted in-person (n = 3) and virtual (n = 3) FGs with rare disease patients to determine if virtual FGs produce similar results in-person FGs. RESULTS: Three in-person (n = 33 participants) and three virtual (n = 25 participants) FGs were conducted examining attitudes and beliefs regarding genetic testing and family communication of risk. Participants included 30 males, 18 females, and 10 parents/guardians. Two independent investigators identified excerpts (meaningful sections of text) and coded themes/sub-themes using a codebook. Inter-coder agreement across identified excerpts (n = 530) in both FG formats was 844/875 (96.5%). Two additional investigators reviewed coded excerpts and did not identify additional themes/sub-themes-supporting data saturation across FG formats. Virtual FGs accounted for 303/530 (57.2%) of total excerpts and 957/1721 (55.7%) of all identified themes/sub-themes. Formats were similar in terms of overall number of excerpts (101 ± 7.8 vs. 75.7 ± 18.8, p = 0.26) and themes/sub-themes (319 ± 6.1 vs. 254.7 ± 103.6, p = 0.34) between virtual and in-person FGs. However, virtual FGs had significantly more coded excerpts specifically relating to sensitive/intimate topics including 'attitudes and beliefs' (n = 320 vs. n = 235, p < 0.001), 'information and support' (n = 184 vs. n = 99, p < 0.001), and 'family communication' (n = 208 vs. n = 114, p < 0.001). CONCLUSIONS: Virtual FGs yielded similar numbers of coded excerpts compared to traditional in-person FGs. Virtual FGs appear to support the relative anonymity of participants, resulting in richer discussion of highly sensitive, intimate topics. Findings support the validity and methodologic rigor of using web-enabled technologies for conducting FGs in rare diseases.
Subject(s)
Communication , Rare Diseases , Female , Focus Groups , Humans , Internet , Male , ParentsABSTRACT
Hairpin RNA (hpRNA) transgenes are the most successful RNA interference (RNAi) method in plants. Here, we show that hpRNA transgenes are invariably methylated in the inverted-repeat (IR) DNA and the adjacent promoter, causing transcriptional self-silencing. Nucleotide substitutions in the sense sequence, disrupting the IR structure, prevent the intrinsic DNA methylation resulting in more uniform and persistent RNAi. Substituting all cytosine with thymine nucleotides, in a G:U hpRNA design, prevents self-silencing but still allows for the formation of hpRNA due to G:U wobble base-pairing. The G:U design induces effective RNAi in 90-96% of transgenic lines, compared to 57-65% for the traditional hpRNA design. While a traditional hpRNA transgene shows increasing self-silencing from cotyledons to true leaves, its G:U counterpart avoids this and induce RNAi throughout plant growth. Furthermore, siRNAs from G:U and traditional hpRNA show different characteristics and appear to function via different pathways to induce target DNA methylation.
Subject(s)
Nucleotides , Plants , Nucleotides/genetics , Nucleotides/metabolism , Plants/metabolism , Plants, Genetically Modified/genetics , Plants, Genetically Modified/metabolism , RNA Interference , RNA, Small Interfering/genetics , RNA, Small Interfering/metabolism , Transgenes/geneticsABSTRACT
Background: Cerebral oximetry using near-infrared spectroscopy (NIRS) has been shown to reduce neurological dysfunction and hospital length-of-stay after adult cardiac surgery in some but not all studies. We audited maintaining cerebral saturations at or above baseline and showed improved neurological and length-of-stay outcomes. Our hypothesis for this study was that our NIRS protocol would improve neurological and length-of-stay outcomes. Methods: This prospective, single centre, double-blinded controlled study randomized 182 consecutive patients, scheduled for cardiac surgery using cardiopulmonary bypass. Participants were randomized by concealed envelope prior to anaesthesia. NIRS study group were managed perioperatively using our NIRS protocol of 8 interventions, increase cardiac output, normocapnia, increase mean arterial pressure, increase inspired oxygen, depth of anaesthesia, blood transfusion, correction of bypass cannula, change of surgical plan to restore levels equal to or above baseline. The control group had standard management without NIRS. Primary outcomes were neurological impairment (early and late) and hospital length-of-stay. Secondary outcomes were ventilation times, intensive care length-of-stay, major organ dysfunction and mortality. Results: 91 patients entered each group. There was a significant improvement in self-reported six-month general functionality in the NIRS group (p = 0.016). Early neurological dysfunction and hospital length-of-stay was the same in both groups. Of the secondary outcomes only Intensive Care length-of-stay was statistically significant, being shorter in the NIRS group (p = 0.026). Conclusion: Maintaining cerebral saturations above baseline reduces time spent in Intensive Care and may improve long term functional recovery but not stroke, major organ dysfunction and mortality.
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OBJECTIVES: We sought to investigate if duplicate faecal immunochemical testing (FIT) sampling improves the negative and positive predictive value of patients thought to be at risk of colorectal cancer (CRC). Specifically, we aimed to investigate whether the proportion of FIT-negative CRC missed by a single FIT test in symptomatic patients could be reduced by duplicate FIT testing. DESIGN: A retrospective service evaluation cohort study of the diagnostic accuracy of duplicate FIT testing. SETTING: Patients referred from primary care with suspected CRC to four secondary care trusts in North-West England. PARTICIPANTS: 28 622 patients over 18-years-old with lower gastrointestinal symptoms suggestive of CRC who completed two FIT samples. PRIMARY AND SECONDARY OUTCOME MEASURES: The performance of duplicate FIT for detecting CRC at a threshold of 10 µgHb/g. RESULTS: The sensitivity if either test was >10 µgHb/g was 0.978 (0.955-0.989), specificity was 0.662 (0.657-0.668), positive predictive value 0.031 (0.028-0.035) and negative predictive value 1.00 (0.999-1.00). Despite two-thirds of patients (18952) being negative following two tests, at this threshold only seven CRC were missed over a 26-month period. All seven patients had other high-risk features which should have prompted investigation. CONCLUSIONS: This study suggests that in routine NHS practice, a duplicate FIT sample strategy together with clinical evaluation for evidence of anaemia and weight loss is superior to a single FIT sample alone and would allow symptomatic patients to be managed in primary care without the need for urgent referral to secondary care for urgent colonic imaging.
Subject(s)
Colorectal Neoplasms , Early Detection of Cancer , Adolescent , Cohort Studies , Colonoscopy , Colorectal Neoplasms/diagnosis , Early Detection of Cancer/methods , England , Feces/chemistry , Hemoglobins/analysis , Humans , Occult Blood , Retrospective Studies , Sensitivity and SpecificityABSTRACT
Most rare diseases are genetic in etiology and characterized by a 'diagnostic odyssey'. Genomic advances have helped speed up the diagnosis for many rare disorders, opening new avenues for precision therapies. Little is known about patient attitudes, experiences, and beliefs about genetic testing for the rare disease congenital hypogonadotropic hypogonadism (CHH). METHODS: We conducted six focus groups with patients with CHH (n = 58). Transcripts were coded by independent investigators and validated by external reviewers. RESULTS: Major themes relating to pre-test experiences were 'attitudes & beliefs' (most frequently cited theme), which revealed altruism as a strong motivator for pursuing research testing and 'information and support,' which revealed a striking lack of pre-testing decisional support/genetic counseling. Major post-test themes included 'return of results,' revealing frustration with the lack of return of results and limited emotional support, and 'family communication,' describing challenging intrafamilial communication. Themes describing ethical concerns (i.e., privacy, use of samples) were least frequently noted and related to pre- and post-test experiences. CONCLUSIONS: Patients with CHH are highly motivated by altruism when pursuing testing but have significant unmet needs for pre-test decisional support and post-test counseling. It is regarded that patient values, beliefs and experiences can inform more person-centered approaches to genetic testing for rare diseases.
ABSTRACT
The National Confidential Enquiry into Patient Outcome and Death reviewed the organisation of services and the quality of clinical care provided to patients who were admitted to hospital following an out-of-hospital cardiac arrest. The report looked at all four links in the 'chain of survival', covering the last link, in-hospital advanced life support and post-resuscitation care, in most detail.
Subject(s)
Cardiopulmonary Resuscitation , Emergency Medical Services , Out-of-Hospital Cardiac Arrest , Hospitalization , Hospitals , Humans , Out-of-Hospital Cardiac Arrest/therapyABSTRACT
BACKGROUND & AIM: PTC923 (formerly CNSA-001), an oral formulation of sepiapterin, a natural precursor of intracellular tetrahydrobiopterin (BH4), has been shown in humans to induce larger increases in circulating BH4 vs. sapropterin dihydrochloride. Sapropterin reduces blood phenylalanine (Phe) by ≥20-30% in a minority of subjects with PKU. This was a Phase 2 randomized, multicenter, three-period crossover, open-label, active controlled, all-comers [regardless of phenylalanine hydroxylase (PAH) variants] comparison of PTC923 60â¯mg/kg, PTC923 20â¯mg/kg and sapropterin 20â¯mg/kg in 24 adults with phenylketonuria (PKU) and hyperphenylalaninemia. METHODS: Eligible subjects were adult men or women (18-60 y) with PKU. Subjects enrolled received 7â¯days of once-daily oral treatment with PTC923 20â¯mg/kg/day, PTC923 60â¯mg/kg/day and sapropterin dihydrochloride 20â¯mg/kg/day each in a random order. Treatments were separated by a 7-day washout. Subjects maintained their usual pre-study diet, including consumption of amino acid mixtures. Blood Phe was measured on Day 1 (predose baseline), Day 3, Day 5, and Day 7 of each treatment period. RESULTS: Least squares mean changes (SE) from baseline in blood Phe were: -206.4 (41.8) µmol/L for PTC923 60â¯mg/kg (pâ¯<â¯0.0001); -146.9 (41.8) µmol/L for PTC923 20â¯mg/kg (pâ¯=â¯0.0010); andâ¯-â¯91.5 (41.7) µmol/L for sapropterin (pâ¯=â¯0.0339). Effects of PTC923 60â¯mg/kg on blood Phe vs. sapropterin were significantly larger (pâ¯=â¯0.0098) and faster in onset with a significantly larger mean reduction in blood Phe at day 3 of treatment, pâ¯=â¯0.0135 (20â¯mg/kg) and pâ¯=â¯0.0007 (60â¯mg/kg). Only PTC923 60â¯mg/kg reduced blood Phe in classical PKU subjects (nâ¯=â¯11, pâ¯=â¯0.0287). The mean blood Phe reduction (PTC923 60â¯mg/kg) in a cofactor responder analysis (nâ¯=â¯8; baseline Phe ≥300⯵mol/L and blood Phe reduction ≥30%) was -463.3⯵mol/L (SE 51.5) from baseline. Adverse events were mostly mild to moderate, transient, and similar across treatment groups with no serious adverse events or discontinuations. CONCLUSIONS: The substantially significantly better effect of PTC923 60â¯mg/kg on blood Phe reduction vs. sapropterin supports further clinical development of PTC923 for PKU; ANZCTR number, ACTRN12618001031257.
Subject(s)
Phenylalanine/blood , Phenylketonurias/drug therapy , Pterins/therapeutic use , Adolescent , Adult , Biopterins/analogs & derivatives , Biopterins/cerebrospinal fluid , Cross-Over Studies , Female , Humans , Male , Phenylalanine/administration & dosage , Phenylketonurias/blood , Pterins/adverse effects , Young AdultABSTRACT
Male hypogonadism (MH) is a common endocrine disorder. However, uncertainties and variations in its diagnosis and management exist. There are several current guidelines on testosterone replacement therapy that have been driven predominantly by single disciplines. The Society for Endocrinology commissioned this new guideline to provide all care providers with a multidisciplinary approach to treating patients with MH. This guideline has been compiled using expertise from endocrine (medical and nursing), primary care, clinical biochemistry, urology and reproductive medicine practices. These guidelines also provide a patient perspective to help clinicians best manage MH.