Cem Ozgonul

Dr. Cem Ozgonul


Research Focus & Metrics

Academic Career Length

14Years (2013-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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8 December 2015 in Ocular Immunology and Inflammation
Verified
Journal Article
Closed access
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COCem Ozgonul
Cem Ozgonul
ESErdim Sertoglu
Erdim Sertoglu
TMTarkan Mumcuoglu
Tarkan Mumcuoglu
GOGokhan Ozge
Gokhan Ozge
GGGokcen Gokce
Gokcen Gokce
Purpose: To assess the levels of neutrophil to lymphocyte ratio (NLR) and platelet to lymphocyte ratio (PLR) in patients with pseudoexfoliation syndrome (PEX) and to compare the NLR and PLR results of patients with PEX, PEX glaucoma (PXG), and healthy controls. Methods: In total, 34 patients with PEX, 29 patients with PXG, and 42 healthy subjects were enrolled in this retrospective study. Complete ophthalmologic examination and complete blood count measurements were performed of all subjects. Complete blood counts were performed within 2 h of blood collection. Results: There was a significant difference in NLR between PEX and control groups (p = 0.012) and PXG and control groups (p = 0.003). Also, a significant difference was found in PLR values between control and PXG groups (p = 0.024). Conclusions: Our study for the first time provides evidence that PLR and NLR may be useful for predicting the prognosis of PEX patients and progression to PXG.

18 February 2017 in International Journal of Ophthalmology
Verified
Journal Article
Open access
COCem Ozgonul
Cem Ozgonul
ESErdim Sertoglu
Erdim Sertoglu
OAOnder Ayyildiz
Onder Ayyildiz
TMTarkan Mumcuoglu
Tarkan Mumcuoglu
MKMurat Kucukevcilioglu
Murat Kucukevcilioglu
ADAli Hakan Durukan
Ali Hakan Durukan
To assess the levels of the neutrophil to lymphocyte ratio (N/L) and the platelet to lymphocyte ratio (P/L) in patients with idiopathic acute anterior uveitis (AAU) and to compare with healthy controls. Thirty-six male patients with idiopathic AAU and 36 male healthy subjects were enrolled in this retrospective study. Complete ophthalmological examination and complete blood count measurements results of all subjects were evaluated. There was a significant difference in N/L and P/L between idiopathic AAU and control groups (P=0.006, P=0.022). Also, correlation analysis revealed a significant correlation between C-reactive protein (CRP) and N/L (P=0.002; r=0.461). Our study for the first time provides evidence of N/L and P/L may be useful biomarkers in patients with idiopathic AAU. N/L is correlated with CRP, so it can be a useful biomarker to predict the prognosis in idiopathic AAU.

11 November 2013 in Current Eye Research
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Journal Article
Closed access
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COCem Ozgonul
Cem Ozgonul
TMTarkan Mumcuoglu
Tarkan Mumcuoglu
AGArmagan Gunal
Armagan Gunal
Purpose: Glaucoma filtration surgery remains the most effective surgical procedure for lowering intraocular pressure (IOP) in uncontrolled glaucoma. Modulation of wound healing is critical to ensure long-term surgical success. This study aimed to determine if bevacizumab is an alternative agent for wound modulation in glaucoma surgery. Materials and methods: Forty-eight eyes of New Zealand rabbits were divided into four groups undergoing standard trabeculectomy surgery in the right eye. In group 1, balanced salt solution injections (0.1 ml) were performed into the bleb. Bevacizumab (0.1 ml, 1.25 mg) was injected into the bleb in group two and into the vitreous body in group three. Subconjunctival injections of 5-fluorouracil (5-FU) were performed into the non-bleb area in group four. Postoperatively; IOP, bleb size, bleb height, bleb vascularity were evaluated. Right eyes of two animals from each group were enucleated in 10th, 20th and 30th d postoperatively and evaluated histopathologically for inflammation, neovascularization and fibrosis. Results: The length, the width and the height of the bleb in the group two were greater than other groups. Mean IOP values were lower in group two. IOP measurements in the operated eyes of group two were statistically significantly lower than the other groups until the 28th d. Inflammation (p = 0.030), neovascularization (p = 0.004) and fibrosis (p < 0.000) in group two were lower in histopathological evaluation. Conclusions: Post-operative subconjunctival injection of bevacizumab is more effective than intravitreal bevacizumab or subconjunctival 5-FU injections for bleb survival. Furthermore, IOP is lower for a long period with lower level of fibrosis, which increases the success of trabeculectomy.

4 January 2018 in Orbit
Verified
Journal Article
Closed access
COCem Ozgonul
Cem Ozgonul
YUYusuf Uysal
Yusuf Uysal
OAOnder Ayyildiz
Onder Ayyildiz
MKMurat Kucukevcilioglu
Murat Kucukevcilioglu
Purpose: To describe clinical, imaging findings, and management of dacryops cases. Methods: A retrospective chart review was performed to identify the patients diagnosed with dacryops over a 5-year period. The clinical features based on clinical findings, computerized tomography and ultrasonography, and observation and surgical excision results were noted when available. Results: We included 14 eyes of 14 patients. Seven (50%) were men with a median age of 48 years. The most common symptom was non-painful upper eyelid mass. All patients had the visible protruding cyst while eversion of the upper eyelid. Imaging studies, including orbital computerized tomography and ultrasonography were performed in six cases. Histological assessment of the excised cyst was done in two cases. Surgical excision was performed in five (36%) cases and observation was elected for nine (64%) cases. The median follow-up was 30 months. There was no recurrence of cysts in patients underwent surgery and the symptoms were not deteriorated in patients elected observation. Conclusion: Dacryops is a rare clinical entity that can be diagnosed easily with or without imaging methods. Surgical excision of the cyst could be curative and observation is also a safe method in selected cases.

21 July 2023 in Cancers
Verified
Journal Article
Open access
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HDHakan Demirci
Hakan Demirci
LTLu Tang
Lu Tang
FDF. Yesim Demirci
F. Yesim Demirci
COCem Ozgonul
Cem Ozgonul
SWSarah Weber
Sarah Weber
Jeffrey SundstromJeffrey Sundstrom
Jeffrey Sundstrom
Due to the close relationship between the vitreous and posterior eye layers, the microenvironment of these layers can affect the composition of the vitreous. Molecular analysis of the vitreous may therefore provide important insights into the pathogenesis of chorioretinal diseases. In this study, vitreous cytokines (n = 41) were evaluated to gain further insights into the tumor microenvironment in uveal melanoma (UM) arising from the choroid (CM). Cytokine levels were measured using a bead-based multiplex immunoassay panel in vitreous samples obtained from 32 eyes, including 18 with CM and 14 controls. Median fluorescence intensity values were extracted and used as relative quantification of the cytokine abundance. Vitreous cytokine levels were compared between the CM and non-CM groups and between different prognostic categories within the CM group (classified as having low or high metastatic risk using tumor biopsy-based gene expression profiling). Correlations between vitreous cytokine levels and tumor dimensions were also evaluated. Our analysis revealed twenty-six vitreous cytokines significantly upregulated in CM-affected eyes compared to the control eyes. Within the CM group, six vitreous cytokines showed altered levels (five upregulated and one downregulated) in eyes with high- vs. low-risk tumors. Levels of these six plus several other cytokines showed correlations with the tumor dimensions. In conclusion, our study has uncovered several UM-relevant vitreous cytokines, worthy of follow-up in larger studies as potential candidates for liquid biopsy-based biomarker development and/or new therapeutic targeting.

5 August 2015 in Turkish Journal of Ophthalmology
Verified
Journal Article
Open access
COCem Ozgonul
Cem Ozgonul
OCOsman Melih Ceylan
Osman Melih Ceylan
FMFatih Mehmet Mutlu
Fatih Mehmet Mutlu
HAHalil İbrahim Altınsoy
Halil İbrahim Altınsoy
MAMustafa Aparcı
Mustafa Aparcı
Cerebral venous sinus thrombosis has a wide spectrum of presentation. The clinical manifestation depends on the location of the thrombus, its rate of progression, and the extent of venous collateralization. In this case report, we present the findings of cerebral venous sinus thrombosis presenting with abducens palsy and papilloedema in a patient with heart failure, an unusual etiology for cerebral venous sinus thrombosis.