Ophthalmic Anthropometry among Rural Dwellers in Mashonaland Central Province, Zimbabwe

Introduction The measures of ophthalmic anthropometric parameters may vary among races and ethnic groups but are of immense importance in clinical diagnosis and management of oculo-visual defects. There is paucity of data on these measures among the Zimbabwean population. Purpose  The aim was to determine ophthalmic anthropometric parameters among rural dwellers in Zimbabwe. Methods Six ophthalmic anthropometric parameters including interpupillary distance (IPD), head width (HW), temple width (TW), length to bend (LTB), and apical radius were measured using a pupillometer, PD rule, Head width calipers, Fairbank facial gauge, and ABDO frame rule. Results A total of 471 participants aged 18 to 100 years (mean age = 55.13; SD± 17.33 years). Of the 471 participants, 206 (43.7%) were males and 265 (56.3%) were females. A mean interpupillary distance at far was 65.57 ± 4.80 mm, mean temple width of 12.49 ± 1.53 cm, mean head width of 13.61 ± 1.39 cm and a side length to bend of 10.24 ± 1.20 cm and the apical radius was 9.94 ± 1.37. There was a significant (P < 0.05) difference between the ophthalmic anthropometric parameters of males and females except for temple width and apical radius. Conclusion A narrower interpupillary distance but a wider temple width was observed among adult Zimbabweans. A significant difference in ophthalmic anthropometric parameters between males and females were observed except for temple width and apical radius. This should inform eyewear manufacturers and importers of frames on the facial and ocular parameters of Zimbabweans to improve the aesthetics and ensure a comfortable vision for wearers of already-made near vision spectacles for presbyopes. Rwanda J Med Health Sci 2021;4(1):99-11

Diagnostic Potential of Imaging Modalities in the Assessment of Lower Urinary Tract Dysfunctions

Lower urinary tract dysfunction (LUTD) is common in both men and women, and the incidence and prevalence increases as people age. Commonly observed symptoms of LUTD include nocturia, urgency, urinary incontinence and frequency of voiding. Recognizing the key role accurate monitoring and evaluation of LUTD play in the day-to-day assessment of the condition, this chapter will explore the diagnostic capabilities of imaging modalities including MRI, ultrasound and fluoroscopy in assessing bladder wall thickness (BWT), detrusor wall thickness (DWT) and estimation of bladder weight both in real-time and static positions, and finally analyze their suitability as surrogates for bladder outlet obstruction (BOO) or detrusor overactivity (DO)

Electromagnetic Method and Vertical Electrical Sounding for Groundwater Potential Assessment of Kintampo North Municipality of Ghana

Electromagnetic (EM) profiling and Vertical Electrical Sounding (VES) of electrical resistivity method have been employed to explore for groundwater in the Kintampo-North Municipality in the Brong Ahafo Region of Ghana. The EM profiling data were obtained with GEONICS EM 34-3 equipment at 20 m intervals along 20 profiles of length ranging between 70 to 240 m to determine conductive anomalous zones for further investigation within the unconsolidated overburden and/or water-bearing fissures in the bedrock. Subsequently, using the ABEM Terrameter, VES employing the Schlumberger electrode configuration was carried out at previously selected 53 promising anomalous points on the EM profiles. The modelled VES data using RES1DINV software revealed a number of subsurface layers and their corresponding apparent resistivity values and thicknesses. The results indicated that the EM terrain conductivity anomaly in the study area varied in the range 6-87 m mhos/m with the average and maximum apparent conductivity values of 48.5 and 76 m mhos/m respectively. The VES revealed three to four-layered lithological subsurface sequence, indicating decreasing apparent resistivity with depth. This depicted the general trend of ρ1< ρ2>> ρ3≤ ρ4, where ρ1, ρ2, ρ3 and ρ4 are the apparent resistivity of the layers 1, 2, 3 and 4 respectively. The results further showed that both the average apparent resistivity and thickness of layers 1, 2, 3 and 4 are respectively 368 Ωm, 3.9 m; 435 Ωm, 17 m; 50 Ωm, 53.5 m and 332 Ωm, >53.5 m. Thus aquifer zones were estimated to be located between 15-30 m depth. These layers were inferred to be the sandy-clay topsoil, weathered/fractured layer and the fresh bedrock. However, the weathered layer and the fractured basement constituted the aquifer zones across the study area within the Voltaian Sedimentary Basin, which is otherwise regarded as a difficult area in locating groundwater resources. Keywords: Groundwater potential, aquifer, apparent resistivity, terrain conductivit

Epigenetic potentiation of somatostatin-2 by guadecitabine in neuroendocrine neoplasias as a novel method to allow delivery of peptide receptor radiotherapy

Background Somatostatin receptor-2 (SSTR2) is expressed on cell surface of neuroendocrine neoplasias; its presence is exploited for the delivery of peptide receptor radionuclide therapy (PRRT). Patients with no or low expression of SSTR2 are not candidates for PRRT. SSTR2 promotor undergoes epigenetic modification, known to regulate gene expression. We investigated whether the demethylation agent, guadecitabine, could enhance the expression of SSTR2 in NET models, using radioligand uptake/PET imaging as a biomarker of epigenetic modification. Methods The effects of guadecitabine on the transcriptional, translational, and functional regulation of SSTR2 both in vitro and in vivo using low (QGP-1) and high (BON-1) methylated neuroendocrine neoplasia models was characterised. Promotor region methylation profiling of clinical samples (n = 61) was undertaken. Safety of combination guadecitabine and PRRT was assessed in vivo. Results Pyrosequencing of cell lines illustrated differential methylation indices – BON: 1 94%, QGP: 1 21%. Following guadecitabine treatment, a dose-dependent increase in SSTR2 in BON-1 at a transcriptional, translational, and functional levels using the SSTR2-directed radioligand, 18F-FET-βAG-TOCA ([18F]-FETO) (150% increase [18F]-FETO uptake, p < 0.05) was observed. In vivo, guadecitabine treatment resulted in a 70% increase in [18F]-FETO uptake in BON-1 tumour models compared models with low baseline percentage methylation (p < 0.05). No additive toxicity was observed with the combination treatment of PRRT and guadecitabine in vivo. Methylation index in clinical samples was 10.5% compared to 5.2% in controls (p = 0.03) and correlated with SSTR2 expression (Wilcoxon rank sign −3.75,p < 0.01). Conclusion Guadecitabine increases SSTR2 expression both in vitro and in vivo. The combination of demethylation agents with PRRT warrants further investigation

In vivo evaluation of [18F]fluoroetanidazole as a new marker for imaging tumour hypoxia with positron emission tomography

Development of hypoxia-targeted therapies has stimulated the search for clinically applicable noninvasive markers of tumour hypoxia. Here, we describe the validation of [18F]fluoroetanidazole ([18F]FETA) as a tumour hypoxia marker by positron emission tomography (PET). Cellular transport and retention of [18F]FETA were determined in vitro under air vs nitrogen. Biodistribution and metabolism of the radiotracer were determined in mice bearing MCF-7, RIF-1, EMT6, HT1080/26.6, and HT1080/1-3C xenografts. Dynamic PET imaging was performed on a dedicated small animal scanner. [18F]FETA, with an octanol–water partition coefficient of 0.16±0.01, was selectively retained by RIF-1 cells under hypoxia compared to air (3.4- to 4.3-fold at 60–120 min). The radiotracer was stable in the plasma and distributed well to all the tissues studied. The 60-min tumour/muscle ratios positively correlated with the percentage of pO2 values <5 mmHg (r=0.805, P=0.027) and carbogen breathing decreased [18F]FETA-derived radioactivity levels (P=0.028). In contrast, nitroreductase activity did not influence accumulation. Tumours were sufficiently visualised by PET imaging within 30–60 min. Higher fractional retention of [18F]FETA in HT1080/1-3C vs HT1080/26.6 tumours determined by dynamic PET imaging (P=0.05) reflected higher percentage of pO2 values <1 mmHg (P=0.023), lower vessel density (P=0.026), and higher radiobiological hypoxic fraction (P=0.008) of the HT1080/1-3C tumours. In conclusion, [18F]FETA shows hypoxia-dependent tumour retention and is, thus, a promising PET marker that warrants clinical evaluation

Critical research gaps and translational priorities for the successful prevention and treatment of breast cancer

INTRODUCTION Breast cancer remains a significant scientific, clinical and societal challenge. This gap analysis has reviewed and critically assessed enduring issues and new challenges emerging from recent research, and proposes strategies for translating solutions into practice. METHODS More than 100 internationally recognised specialist breast cancer scientists, clinicians and healthcare professionals collaborated to address nine thematic areas: genetics, epigenetics and epidemiology; molecular pathology and cell biology; hormonal influences and endocrine therapy; imaging, detection and screening; current/novel therapies and biomarkers; drug resistance; metastasis, angiogenesis, circulating tumour cells, cancer 'stem' cells; risk and prevention; living with and managing breast cancer and its treatment. The groups developed summary papers through an iterative process which, following further appraisal from experts and patients, were melded into this summary account. RESULTS The 10 major gaps identified were: (1) understanding the functions and contextual interactions of genetic and epigenetic changes in normal breast development and during malignant transformation; (2) how to implement sustainable lifestyle changes (diet, exercise and weight) and chemopreventive strategies; (3) the need for tailored screening approaches including clinically actionable tests; (4) enhancing knowledge of molecular drivers behind breast cancer subtypes, progression and metastasis; (5) understanding the molecular mechanisms of tumour heterogeneity, dormancy, de novo or acquired resistance and how to target key nodes in these dynamic processes; (6) developing validated markers for chemosensitivity and radiosensitivity; (7) understanding the optimal duration, sequencing and rational combinations of treatment for improved personalised therapy; (8) validating multimodality imaging biomarkers for minimally invasive diagnosis and monitoring of responses in primary and metastatic disease; (9) developing interventions and support to improve the survivorship experience; (10) a continuing need for clinical material for translational research derived from normal breast, blood, primary, relapsed, metastatic and drug-resistant cancers with expert bioinformatics support to maximise its utility. The proposed infrastructural enablers include enhanced resources to support clinically relevant in vitro and in vivo tumour models; improved access to appropriate, fully annotated clinical samples; extended biomarker discovery, validation and standardisation; and facilitated cross-discipline working. CONCLUSIONS With resources to conduct further high-quality targeted research focusing on the gaps identified, increased knowledge translating into improved clinical care should be achievable within five years

Recommendations for environmental risk assessment of gene drive applications for malaria vector control

This is the final version. Available on open access from BMC via the DOI in this record. Building on an exercise that identified potential harms from simulated investigational releases of a population suppression gene drive for malaria vector control, a series of online workshops identified nine recommendations to advance future environmental risk assessment of gene drive applications.Bill and Melinda Gates FoundationOpen Philanthrop

A responsibility to protect Africa from the West? South Africa and the NATO intervention in Libya

This article will argue that South Africa’s approach to conflict mediation and peace building is informed by the ANC’s experience of the transition to democracy in South Africa and is widely misinterpreted. This was particularly evident in the Libyan crisis, where South Africa was widely accused of exhibiting a morally duplicitous and ideologically rudderless foreign policy because of the manner in which it initially supported intervention and subsequently became one of the fiercest critics of the NATO campaign. It will be argued that this is an inaccurate caricature of South Africa’s foreign policy and that South Africa’s approach could in fact inject vital pluralism into debates about the future of humanitarian interventions in Africa. The article draws upon interviews with senior officials in the ruling African National Congress (ANC) and South African officials who negotiated the UN Security Council resolutions that sanctioned intervention in Libya