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Gichuhi S, Kabiru J, M'bongo Zindamoyen A, Rono H, Ollando E, Wachira J, Munene R, Onyuma T, Sagoo MS, Macleod D, Weiss HA, Burton MJ. Delay along the care-seeking journey of patients with ocular surface squamous neoplasia in Kenya. BMC Health Serv Res 2017; 17:485. [PMID: 28705204 PMCID: PMC5512725 DOI: 10.1186/s12913-017-2428-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Accepted: 07/03/2017] [Indexed: 12/29/2022] Open
Abstract
Background In Africa, accessing eye health services is a major challenge. Ocular surface squamous neoplasia (OSSN) is a substantial ocular health problem in Africa related to solar UV light exposure and HIV infection among other risk factors. The disease causes visual loss and even death in advanced cases. This study was conducted to assess referral pathway and treatment delay for patients with OSSN in Kenya. Methods Adults with conjunctival lesions presenting to four eye centres were asked about their occupations, when they noticed the growth, health facilities visited in seeking care, cost of consultation, surgery, medicines and histopathology and dates at each step. The time-to-presentation was divided into quartiles and correlates analysed using ordinal logistic regression. Results We evaluated 158 first-time presenters with OSSN. Most were women (102 [65%]), living with HIV (78/110 tested [71%]), with low to medium income (127 [80%]). Most of the HIV patients (49/78 [63%]) were in antiretroviral care programs. About half (88/158, [56%]) presented directly to the study centres while the rest were referred. Indirect presenters sought care earlier than direct presenters (median 2.0 months vs 5.5 months) and travelled a shorter distance to the first health facility (median 20 km vs 30 km) but had surgery later (median 12.5 months vs 5.5 months). Visits beyond the first health facility for indirect presenters markedly increased delay (median 7.3, 29.0, 37.9, and 32.0 months for 1–4 facilities, respectively). Delay was associated with number of health facilities visited (adjusted ordered OR = 9.12; 95%CI 2.83–29.4, p < 0.001) and being female (adjusted ordered OR = 2.42; 95%CI 1.32–4.44, p = 0.004). At the time of presentation at the study centres for surgery the median tumour diameter in both directly and indirectly presenting patients was 6 mm (p = 0.52) and the histological spectrum of OSSN was similar between the groups (p = 0.87). Conclusions Referral delays definitive treatment for OSSN. Women were more likely to experience delay. Despite regular contact with the health system for those with known HIV infection, delays occurred. Early detection and referral of OSSN in the HIV service might reduce delays, but reassuringly delay did not give rise to a larger proportion with more advanced grade of OSSN. Electronic supplementary material The online version of this article (doi:10.1186/s12913-017-2428-4) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Stephen Gichuhi
- International Centre for Eye Health, London School of Hygiene and Tropical Medicine, Keppel Street, London, WC1E 7HT, UK. .,Department of Ophthalmology, University of Nairobi, P.O Box 19676-00202, Nairobi, Kenya.
| | - Joy Kabiru
- PCEA Kikuyu Eye Unit, PO Box 45, Kikuyu, Kenya
| | | | - Hillary Rono
- International Centre for Eye Health, London School of Hygiene and Tropical Medicine, Keppel Street, London, WC1E 7HT, UK.,Kitale District Hospital, PO Box 98-30200, Kitale, Kenya
| | | | - Joseph Wachira
- Kenyatta National Hospital, PO Box 20723-00202, Nairobi, Kenya
| | - Rhoda Munene
- Kenyatta National Hospital, PO Box 20723-00202, Nairobi, Kenya
| | - Timothy Onyuma
- Department of Pathology, MP Shah Hospital, PO Box 14497-00800, Nairobi, Kenya
| | - Mandeep S Sagoo
- UCL Institute of Ophthalmology, 11-43 Bath Street, London, EC1V 9EL, UK.,Moorfields Eye Hospital, 162 City Road, London, EC1V 2PD, UK.,St. Bartholomew's Hospital, W Smithfield, London, London, EC1A 7BE, UK
| | - David Macleod
- International Centre for Eye Health, London School of Hygiene and Tropical Medicine, Keppel Street, London, WC1E 7HT, UK.,MRC Tropical Epidemiology Group, London School of Hygiene and Tropical Medicine, Keppel Street, London, WC1E 7HT, UK
| | - Helen A Weiss
- International Centre for Eye Health, London School of Hygiene and Tropical Medicine, Keppel Street, London, WC1E 7HT, UK.,MRC Tropical Epidemiology Group, London School of Hygiene and Tropical Medicine, Keppel Street, London, WC1E 7HT, UK
| | - Matthew J Burton
- International Centre for Eye Health, London School of Hygiene and Tropical Medicine, Keppel Street, London, WC1E 7HT, UK.,Moorfields Eye Hospital, 162 City Road, London, EC1V 2PD, UK
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Gichuhi S, Macharia E, Kabiru J, Zindamoyen AM, Rono H, Ollando E, Wachira J, Munene R, Onyuma T, Jaoko WG, Sagoo MS, Weiss HA, Burton MJ. Risk factors for ocular surface squamous neoplasia in Kenya: a case-control study. Trop Med Int Health 2016; 21:1522-1530. [PMID: 27714903 PMCID: PMC5574019 DOI: 10.1111/tmi.12792] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
OBJECTIVE To determine modifiable risk factors of ocular surface squamous neoplasia (OSSN) in Kenya using disease-free controls. METHODS Adults with conjunctival lesions were recruited at four eye care centres in Kenya and underwent excision biopsy. An equal number of controls having surgery for conditions not affecting the conjunctiva and unrelated to ultraviolet light were group-matched to cases by age group, sex and eye care centre. Associations of risk factors with OSSN were evaluated using multivariable logistic regression to estimate odds ratios (ORs) and 95% confidence intervals (95% CIs). Continuous variables were compared using the t-test or the Wilcoxon-Mann-Whitney U-test depending on their distribution. RESULTS A total of 131 cases and 131 controls were recruited. About two-thirds of participants were female, and the mean age of cases and controls was 42.1 years and 43.3 years, respectively. Risk factors for OSSN were HIV infection without antiretroviral therapy (ART) use (OR = 48.42; 95% CI: 7.73-303.31) and with ART use (OR = 19.16; 95% CI: 6.60-55.57), longer duration of exposure to the sun in the main occupation (6.9 h/day vs. 4.6 h/day, OR = 1.24; 95% CI: 1.10-1.40) and a history of allergic conjunctivitis (OR = 74.61; 95% CI: 8.08-688.91). Wearing hats was protective (OR = 0.22; 95% CI: 0.07-0.63). CONCLUSION Measures to prevent and control HIV, reduce sun exposure such as wearing hats and control allergic conjunctivitis are recommended.
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Affiliation(s)
- Stephen Gichuhi
- International Centre for Eye Health, London School of Hygiene and Tropical Medicine, London, UK.,Department of Ophthalmology, University of Nairobi, Nairobi, Kenya
| | | | | | | | - Hillary Rono
- International Centre for Eye Health, London School of Hygiene and Tropical Medicine, London, UK.,Kitale District Hospital, Kitale, Kenya
| | | | | | | | - Timothy Onyuma
- Department of Pathology, MP Shah Hospital, Nairobi, Kenya
| | - Walter G Jaoko
- KAVI Institute of Clinical Research, University of Nairobi, Nairobi, Kenya
| | - Mandeep S Sagoo
- UCL Institute of Ophthalmology, London, UK.,Moorfields Eye Hospital, London, UK.,St. Bartholomew's Hospital, London, UK
| | - Helen A Weiss
- MRC Tropical Epidemiology Group, London School of Hygiene and Tropical Medicine, London, UK
| | - Matthew J Burton
- International Centre for Eye Health, London School of Hygiene and Tropical Medicine, London, UK.,Moorfields Eye Hospital, London, UK
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Gichuhi S, Macharia E, Kabiru J, Zindamoyen AM, Rono H, Ollando E, Wachira J, Munene R, Maina J, Onyuma T, Sagoo MS, Weiss HA, Burton MJ. Topical fluorouracil after surgery for ocular surface squamous neoplasia in Kenya: a randomised, double-blind, placebo-controlled trial. Lancet Glob Health 2016; 4:e378-85. [PMID: 27198842 PMCID: PMC5081398 DOI: 10.1016/s2214-109x(16)30052-3] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Revised: 03/23/2016] [Accepted: 04/02/2016] [Indexed: 12/15/2022]
Abstract
BACKGROUND Ocular surface squamous neoplasia (OSSN) is an aggressive eye tumour particularly affecting people with HIV in Africa. Primary treatment is surgical excision; however, tumour recurrence is common. We assessed the effect of fluorouracil 1% eye drops after surgery on recurrence. METHODS We did this multicentre, randomised, placebo-controlled trial in four centres in Kenya. We enrolled patients with histologically proven OSSN aged at least 18 years. After standard surgical excision, participants were randomly allocated to receive either topical fluorouracil 1% or placebo four times a day for 4 weeks. Randomisation was stratified by surgeon, and participants and trial personnel were masked to assignment. Patients were followed up at 1 month, 3 months, 6 months, and 12 months. The primary outcome was clinical recurrence (supported by histological assessment where available) by 1 year, and analysed by intention to treat. The sample size was recalculated because events were more common than anticipated, and trial enrolment was stopped early. The trial was registered with Pan-African Clinical Trials Registry (PACTR201207000396219). FINDINGS Between August, 2012, and July, 2014, we assigned 49 participants to fluorouracil and 49 to placebo. Four participants were lost to follow-up. Recurrences occurred in five (11%) of 47 patients in the fluorouracil group and 17 (36%) of 47 in the placebo group (odds ratio 0·21, 95% CI 0·07-0·63; p=0·01). Adjusting for passive smoking and antiretroviral therapy had little effect (odds ratio 0·23; 95% CI 0·07-0·75; p=0·02). Adverse effects occurred more commonly in the fluorouracil group, although they were transient and mild. Ocular discomfort occurred in 43 of 49 patients in the fluorouracil group versus 36 of 49 in the placebo group, epiphora occurred in 24 versus five, and eyelid skin inflammation occurred in seven versus none. INTERPRETATION Topical fluorouracil after surgery substantially reduced recurrence of OSSN, was well-tolerated, and its use recommended. FUNDING British Council for Prevention of Blindness and the Wellcome Trust.
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Affiliation(s)
- Stephen Gichuhi
- London School of Hygiene & Tropical Medicine, London, UK,Department of Ophthalmology, University of Nairobi, Nairobi, Kenya,Correspondence to: Dr Stephen Gichuhi, International Centre for Eye Health, London School of Hygiene & Tropical Medicine, London WC1E 7HT, UKCorrespondence to: Dr Stephen GichuhiInternational Centre for Eye HealthLondon School of Hygiene & Tropical MedicineLondonWC1E 7HTUK
| | | | | | | | | | | | | | | | | | - Timothy Onyuma
- Department of Pathology, MP Shah Hospital, Nairobi, Kenya
| | - Mandeep S Sagoo
- UCL Institute of Ophthalmology, University College London, London, UK,Moorfields Eye Hospital, London, UK,St Bartholomew's Hospital, London, London, UK
| | - Helen A Weiss
- London School of Hygiene & Tropical Medicine, London, UK
| | - Matthew J Burton
- London School of Hygiene & Tropical Medicine, London, UK,Moorfields Eye Hospital, London, UK
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Gichuhi S, Macharia E, Kabiru J, Zindamoyen AM, Rono H, Ollando E, Wanyonyi L, Wachira J, Munene R, Onyuma T, Jaoko WG, Sagoo MS, Weiss HA, Burton MJ. Toluidine Blue 0.05% Vital Staining for the Diagnosis of Ocular Surface Squamous Neoplasia in Kenya. JAMA Ophthalmol 2016; 133:1314-21. [PMID: 26378623 DOI: 10.1001/jamaophthalmol.2015.3345] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
IMPORTANCE Clinical features are unreliable for distinguishing ocular surface squamous neoplasia (OSSN) from benign conjunctival lesions. OBJECTIVE To evaluate the adverse effects, accuracy, and interobserver variation of toluidine blue 0.05% vital staining in distinguishing OSSN, confirmed by histopathology, from other conjunctival lesions. DESIGN, SETTING, AND PARTICIPANTS Cross-sectional study in Kenya from July 2012 through July 2014 of 419 adults with suspicious conjunctival lesions. Pregnant and breastfeeding women were excluded. EXPOSURES Comprehensive ophthalmic slitlamp examination was conducted. Vital staining with toluidine blue 0.05% aqueous solution was performed before surgery. Initial safety testing was conducted on large tumors scheduled for exenteration looking for corneal toxicity on histology before testing smaller tumors. We asked about pain or discomfort after staining and evaluated the cornea at the slitlamp for epithelial defects. Lesions were photographed before and after staining. MAIN OUTCOMES AND MEASURES Diagnosis was confirmed by histopathology. Six examiners assessed photographs from a subset of 100 consecutive participants for staining and made a diagnosis of OSSN vs non-OSSN. Staining was compared with histopathology to estimate sensitivity, specificity, and predictive values. Adverse effects were enumerated. Interobserver agreement was estimated using the κ statistic. RESULTS A total of 143 of 419 participants (34%) had OSSN by histopathology. The median age of all participants was 37 years (interquartile range, 32-45 years) and 278 (66%) were female. A total of 322 of the 419 participants had positive staining while 2 of 419 were equivocal. There was no histological evidence of corneal toxicity. Mild discomfort was reported by 88 (21%) and mild superficial punctate keratopathy seen in 7 (1.7%). For detecting OSSN, toluidine blue had a sensitivity of 92% (95% CI, 87%-96%), specificity of 31% (95% CI, 25%-36%), positive predictive value of 41% (95% CI, 35%-46%), and negative predictive value of 88% (95% CI, 80%-94%). Interobserver agreement was substantial for staining (κ = 0.76) and moderate for diagnosis (κ = 0.40). CONCLUSIONS AND RELEVANCE With the high sensitivity and low specificity for OSSN compared with histopathology among patients with conjunctival lesions, toluidine blue 0.05% vital staining is a good screening tool. However, it is not a good diagnostic tool owing to a high frequency of false-positives. The high negative predictive value suggests that a negative staining result indicates that OSSN is relatively unlikely.
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Affiliation(s)
- Stephen Gichuhi
- London School of Hygiene and Tropical Medicine, London, England2Department of Ophthalmology, University of Nairobi, Nairobi, Kenya
| | | | | | | | | | | | | | | | | | - Timothy Onyuma
- Department of Pathology, MP Shah Hospital, Nairobi, Kenya
| | - Walter G Jaoko
- KAVI Institute of Clinical Research, University of Nairobi, Nairobi, Kenya
| | - Mandeep S Sagoo
- University College London Institute of Ophthalmology, London, England10Moorfields Eye Hospital, London, England11St Bartholomew's Hospital, London, England
| | - Helen A Weiss
- London School of Hygiene and Tropical Medicine, London, England
| | - Matthew J Burton
- London School of Hygiene and Tropical Medicine, London, England10Moorfields Eye Hospital, London, England
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Gichuhi S, Macharia E, Kabiru J, Zindamoyen AM, Rono H, Ollando E, Wanyonyi L, Wachira J, Munene R, Onyuma T, Sagoo MS, Weiss HA, Burton MJ. Clinical Presentation of Ocular Surface Squamous Neoplasia in Kenya. JAMA Ophthalmol 2016; 133:1305-13. [PMID: 26378395 DOI: 10.1001/jamaophthalmol.2015.3335] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
IMPORTANCE There is a trend toward treating conjunctival lesions suspected to be ocular surface squamous neoplasia (OSSN) based on the clinical impression. OBJECTIVE To describe the presentation of OSSN and identify clinical features that distinguish it from benign lesions and subsequently evaluate their recognizability. DESIGN, SETTING, AND PARTICIPANTS Prospective multicenter study in Kenya from July 2012 through July 2014 of 496 adults presenting with conjunctival lesions. One histopathologist examined all specimens. Six additional masked ophthalmologists independently examined photographs from 100 participants and assessed clinical features. EXPOSURES Comprehensive history, slitlamp examination, and photography before excision biopsy. MAIN OUTCOMES AND MEASURES Frequency of clinical features in OSSN and benign lesions were recorded. Proportions and means were compared using χ2, Fisher exact test, or t test as appropriate. Interobserver agreement was estimated using the κ statistic. Examiners' assessments were compared with a reference. RESULTS Among 496 participants, OSSN was the most common (38%) histological diagnosis, followed by pterygium (36%) and actinic keratosis (19%). Patients with OSSN were slightly older (mean [SD] age, 41 [11.6] vs 38 [10.9] years; P = .002) and tended to have lower levels of education than patients with benign lesions (P = .001). Females predominated (67% of OSSN vs 64% of benign lesions; P = .65). Human immunodeficiency virus infection was common among patients with OSSN (74%). The most common location was the nasal limbus (61% OSSN vs 78% benign lesions; P < .001). Signs more frequent in OSSN included feeder vessels (odds ratio [OR], 5.8 [95% CI, 3.2-10.5]), moderate inflammation (OR, 3.5 [95% CI, 1.8-6.8]), corneal involvement (OR, 2.7 [95% CI, 1.8-4.0]), leukoplakia (OR, 2.6 [95% CI, 1.7-3.9]), papilliform surface (OR, 2.1 [95% CI, 1.3-3.5]), pigmentation (OR, 1.5 [95% CI, 1.0-2.2]), temporal location (OR, 2.0 [95% CI, 1.2-3.2]), circumlimbal location (6.7% vs 0.3%; P < .001), severe inflammation (6.7% vs 0.3%; P < .001), and larger mean (SD) diameter (6.8 [3.2] vs 4.8 [2.8] mm; P < .001). All OSSN signs were also observed in benign lesions. There was slight to fair interobserver agreement in assessment of most signs and diagnosis (κ, 0.1-0.4). The positive predictive value of clinical appearance in identifying OSSN was 54% (interquartile range, 51%-56%) from photographs in which prevalence was 32%. CONCLUSIONS AND RELEVANCE With overlapping phenotypes and modest interobserver agreement, OSSN and benign conjunctival lesions are not reliably distinguished clinically. Point-of-care diagnostic tools may help.
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Affiliation(s)
- Stephen Gichuhi
- London School of Hygiene and Tropical Medicine, London, England2Department of Ophthalmology, University of Nairobi, Nairobi, Kenya
| | | | | | | | - Hilary Rono
- Eye Department, Kitale District Hospital, Kitale, Kenya
| | | | | | - Joseph Wachira
- Ophthalmology Department, Kenyatta National Hospital, Nairobi, Kenya
| | - Rhoda Munene
- Ophthalmology Department, Kenyatta National Hospital, Nairobi, Kenya
| | - Timothy Onyuma
- Department of Pathology, MP Shah Hospital, Nairobi, Kenya
| | - Mandeep S Sagoo
- UCL Institute of Ophthalmology, London, England9Moorfields Eye Hospital, London, England10St Bartholomew's Hospital, London, England
| | - Helen A Weiss
- London School of Hygiene and Tropical Medicine, London, England
| | - Matthew J Burton
- London School of Hygiene and Tropical Medicine, London, England9Moorfields Eye Hospital, London, England
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