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Featured researches published by S. Omar.


European Journal of Radiology | 2012

Elastography ultrasound and questionable breast lesions: Does it count?

Sahar Mahmoud Mansour; Omar S. Omar

OBJECTIVE To check possible additional value of using elastography ultrasound in the specification of questionable breast lesions. SUBJECTS AND METHODS Questionable breast lesions on gray scale ultrasound examination had been further evaluated by elastography ultrasound in 97 cases with median age of 42 years. The studied lesions were pathologically proven (58 benign and 39 malignant) using true cut tissue/surgical excision biopsy that was considered the gold standard of reference. RESULTS Conventional ultrasound categorization before biopsy included: category 3 (probably benign) in 42.3% (n=41), category 4a (low suspicion of malignancy) in 13.4% (n=13), category 4b (intermediate suspicion of malignancy) in 16.5% (n=16) and category 4c (moderate suspicion of malignancy) in 27.8% (n=27). We had evaluated elastography ultrasound regarding elastography strain scoring and quantitative strain ratio. Sensitivity, specificity and accuracy were 89.7%, 86.2% and 87.6% for conventional ultrasound, 92.3%, 74.1% and 81.4% for elastogram 5-point scoring method and 87.1%, 89.6% and 88.6% for the calculated strain ratios respectively in the assessment of the examined breast lesions. CONCLUSION Ultrasound elastography, using both qualitative and quantitative methods can improve the performance of conventional B-mode ultrasound and enhance its specificity and accuracy in the diagnosis of questionable (BI-RADS categories 3 and 4) breast lesions.


International Journal of Inflammation | 2013

Risk factors for chronic mastitis in morocco and Egypt

Hanna N. Oltean; Amr S. Soliman; Omar S. Omar; Tamer Youssef; Mehdi Karkouri; Azza Abdel-Aziz; Ahmad Hablas; Taylor Blachley; A. Tahri; Sofia D. Merajver

Chronic mastitis is a prolonged inflammatory breast disease, and little is known about its etiology. We identified 85 cases and 112 controls from 5 hospitals in Morocco and Egypt. Cases were women with chronic mastitis (including periductal, lobular, granulomatous, lymphocytic, and duct ectasia with mastitis). Controls had benign breast disease, including fibroadenoma, benign phyllodes, and adenosis. Both groups were identified from histopathologically diagnosed patients from 2008 to 2011, frequency-matched on age. Patient interviews elicited demographic, reproductive, breastfeeding, and clinical histories. Cases had higher parity than controls (OR = 1.75, 1.62–1.90) and more reported history of contraception use (OR = 2.73, 2.07–3.61). Cases were less likely to report wearing a bra (OR = 0.56, 0.47–0.67) and less often used both breasts for breastfeeding (OR = 4.40, 3.39–5.72). Chronic mastitis cases were significantly less likely to be employed outside home (OR = 0.71, 0.60–0.84) and more likely to report mice in their households (OR = 1.63, 1.36–1.97). This is the largest case-control study reported to date on risk factors for chronic mastitis. Our study highlights distinct reproductive risk factors for the disease. Future studies should further explore these factors and the possible immunological and susceptibility predisposing conditions.


Value in health regional issues | 2018

Return on Investment Analysis of Breast Cancer Screening and Downstaging in Egypt: Implications for Developing Countries

Alena N. Skrundevskiy; Omar S. Omar; Jungyoon Kim; Amr S. Soliman; Theodore A. Korolchuk; Fernando A. Wilson

OBJECTIVE The aim of this study was to perform a return-on-investment (ROI) analysis of a breast cancer screening program in Egypt by comparing net profit in treatment costs saved to program cost investment. METHODS The breast cancer downstaging program targeted women living in an Egyptian slum, where residents have low access to health care. Program costs were estimated by using data from interviews with program administrative staff. Screening and treatment costs were estimated by using Ministry of Health medical reimbursement data. Estimates for expected rates of downstaging were modeled on the basis of data from a previous study. ROI, or relative cost savings, was calculated by comparing treatment cost savings to costs for the screening program. A baseline ROI for facility-based screening was calculated, followed by ROIs for different scenarios. RESULTS Average per-person treatment cost for screened and unscreened patients was estimated to be


Journal of The American College of Surgeons | 2017

Quantitative Assessment of Tension Reduction at the Midline Closure During Abdominal Component Separation

Ahmed M. Afifi; Emily Hartmann; Ahmed Talaat; Ashraf Abo Alfotooh; Omar S. Omar; Sayed Mareei; Ruston Sanchez; Steve J. Kempton

28,632 and


Cancer Imaging | 2014

Impact of three dimensional tomosynthesis on the detection and diagnosis of breast lesions

Sahar Mahmoud Mansour; Lamia Adel; Omina Mokhtar; Omar S. Omar

58,170, respectively, with a cumulative lifetime risk of 6.36%. Total screening program cost per person was


Clinical Breast Cancer | 2017

Detection of Human Cytomegalovirus (HCMV) in Malignant and Benign Breast Tumors in Egyptian Women

Dalia F. El Shazly; Abeer A. Bahnassey; Omar S. Omar; Elsayed Tarek Elsayed; Ali Al-Hindawi; Eman El-Desouky; Hend Youssef; Abdel-Rahman N. Zekri

112.10. The study estimated an expected decrease in late-stage breast cancer diagnosis by 13.7% as a result of the screening program, saving


Breast Journal | 2016

Chronic Mastitis in Egypt and Morocco: Differentiating between Idiopathic Granulomatous Mastitis and IgG4-Related Disease

Steven G. Allen; Amr S. Soliman; Kathleen Toy; Omar S. Omar; Tamer Youssef; Mehdi Karkouri; Essam Ayad; Azza Abdel-Aziz; Ahmed Hablas; A. Tahri; Hanna N. Oltean; Celina G. Kleer; Sofia D. Merajver

4,049 in treatment costs per individual diagnosed. The analysis resulted in a positive ROI of 133% for facility-based screening. CONCLUSIONS Breast cancer represents an increasing burden on health care in Egypt and other developing countries. This study concludes that a community-based downstaging program resulted in a positive ROI, or overall cost-savings. The findings inform that policymakers in low-income and middle-income countries may consider implementing community-based downstaging programs for breast cancer.


Cancer Research | 2014

Abstract 4977: Chronic mastitis in North Africa: Geographic overlap and a potential precursor comorbidity of inflammatory breast cancer

Steven G. Allen; Hanna N. Oltean; Kathy Toy; Omar S. Omar; Tamer Youssef; Mehdi Karkouri; Azza Abdel-Aziz; Ahmad Hablas; A. Tahri; Celina G. Kleer; Amr Soliman; Sofia D. Merajver

BACKGROUND Abdominal component separation is used commonly for closure of midline abdominal wounds. The value of each step in reducing tension has not been studied. Our aim was to test whether component separation decreases tension in the midline closure and to quantify the value of each procedural step. STUDY DESIGN Tension required to bring the rectus muscle to midline was measured using tensiometry after subcutaneous dissection (step 1), external oblique muscle release (step 2), separation of the internal and external oblique muscles (step 3), and internal oblique muscle release (step 4). Measurements were taken in the upper, middle, and lower thirds of the abdominal midline. Distance to midline was also measured after each surgical step. Tension (measured as percent change) and distance were analyzed using Students t-test with significance set at p < 0.05. RESULTS In 41 hemi-abdominal defects, tension decreased in middle, upper, and lower thirds of the abdomen by 22.5%, 24.3%, and 34.8% after step 1; 33.4%, 31.8%, and 39.8% after step 2; 26.5%, 22.2%, and 27.4% after step 3; and 33.2%, 28.2%, and 23.5% after step 4. Mean distance change was 0.97 cm, 1.97 cm, 2.22 cm, and 2.59 cm after steps 1 to 4, respectively. CONCLUSIONS This study shows through a quantitative measure of tension that all steps of the component separation procedure decrease wound tension to variable degrees, with the release of the external and internal oblique muscles being the more effective steps. An internal oblique release is a useful and simple adjunct to the classical component separation procedure.


Tumor Biology | 2015

Clinical utility of certain biomarkers as predictors of breast cancer with or without metastasis among Egyptian females

Samia A. Ahmed; Manal A. Hamed; Omar S. Omar

Subjects and methods The study included 166 mammograms with indeterminate findings selected from 1600 mammograms. They were classified into two groups: group 1 ‘Diagnostic mammograms’ of symptomatic women and group 2 ‘Screening mammograms’. Dense breasts assigned as ACR3 and ACR4 presented 69% (n = 114/166) of the studied cases. FFDM and 3D tomosynthesis examination was done and imaging findings were evaluated before and after the use of 3D tomosynthesis images.


The Egyptian Journal of Radiology and Nuclear medicine | 2014

Comparative study between breast tomosynthesis and classic digital mammography in the evaluation of different breast lesions

Sahar Mahmoud Mansour; Lamia Adel; Omina Mokhtar; Omar S. Omar

&NA; Many studies have suggested that human cytomegalovirus (HCMV) is associated with several human malignancies, including breast cancer (BC). We assessed the presence of HCMV proteins (PP65 and early/immediate early [E/IE]) and DNA in blood and tissue samples and adjacent non‐neoplastic tissues obtained from 61 BC patients and 20 patients with fibroadenoma (FA) cases. A significant difference was found in the index value of anti‐CMV IgG antibodies between BC patients and the control group (P = .001). We found a significant association between the expression of CMV PP65 and E/IE proteins in the malignant and FA groups (P < .001). A statistically significant correlation was found between the expression of both viral proteins (PP65 and E/IE) and estrogen receptor–positive (ER+)/HER2neu−, progesterone receptor–positive (PR+)/HER2neu−, and ER+, PR+/HER2neu− BC cases. The concordance between the results obtained by the different assays was low. Introduction: Previous studies have reported a role for human cytomegalovirus (HCMV) in breast carcinogenesis. We sought to assess the role of HCMV infection in the development and/or progression of breast cancer (BC) among Egyptian patients. Patients and Methods: The study included 61 patients with BC cases. Of these 61 patients, 40 had been assessed for HCMV in the blood, BC tissue samples, and adjacent non‐neoplastic tissue samples, and 21 had been assessed for HCMV in the tissue only. Tissue samples from 20 patients with fibroadenoma (FA) were also included. As a control group, 41 blood samples obtained from healthy women with no history of cancer were used as a blood control group. HCMV was assessed using enzyme‐linked immunosorbent assay, real‐time polymerase chain reaction (PCR), and immunohistochemistry (IHC). Results: A significant difference was found in the index value for the anti‐CMV IgG antibodies between the BC patients and the control group (P = .001). Using real‐time PCR, HCMV DNA was detected in 11 of 61 BC tissues (18%) compared with 1 of 20 FA tissues (5%). HCMV DNA was present in 8 of the 40 plasma samples (20%). Regarding the viral proteins, 21 of 61 samples (34.4%) were positive for early/immediate early (E/IE) and 49 (80.3%) were positive for PP65 expression by IHC. The concordance between the results obtained by the different assays was low. CMVPP65 expression was significantly associated with E/IE protein expression in the malignant and FA groups (P < .001). Conclusion: The presence of CMV proteins and DNA in BC tissues suggests a role for this virus. However, the basic criteria to support a causal association of HCMV with BC were not fulfilled.

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Amr S. Soliman

University of Nebraska–Lincoln

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A. Tahri

Cadi Ayyad University

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