1. Ten-year Clinicopathological Review Of Ocular Surface Squamous Neoplasia In An Ophthalmological Center In Mexico City Lucero Pedro-Aguilar, M. D. Alvarez-Melloni Diana, MD Uribe-Martínez Yvette, MD Ramirez-Miranda Arturo, MD Navas Alejandro, MD Jimenez-Corona Aida, PhD Graue-Hernández Enrique O., MD, MSc

2. Financial Disclosure The authors have no financial in the subject matter of this poster

3. Background Ocular surface squamous neoplasia (OSSN) can present clinically in many different ways, with diagnosis of certainty resting on histopathological examination. Previous reports have associated surgical excision with high rates of recurrence 1 Reported ranges varies between 17% to 24% for dysplasia and 30% to 41% for squamous cell carcinoma 2 1.Lee GA and Hirst LW. Ocular surface squamous neoplasia. Surv Ophthalmol 1995;39:429-50 2.Yousef YA and Finger PT. Squamous carcinoma and dysplasia of the conjunctiva and cornea: an analysis of 101 cases. Ophthalmology 2012;119:233-40.

4. Purpose To evaluate clinical and histopathologic factors of surgically excised ocular surface squamous neoplasia associated with its recurrence

5. Methods Retrospective cases review (January 2003-October 2013) Confirmed histopathological diagnosis of benign, preinvasive, or invasive lesions of the conjunctiva and cornea Analyzed variables were tumor’s clinical appearance, size, extension, histopathological result and recurrence rate

6. Results Records of 358 patients 110 eyes of 108 patients (62 men, 48 women) were included Age 6–93 years (mean, 59.3 years± 20.7 years). Median follow-up was 20.5 months (Interquartile Range 25-75, 5 to 33) 49 eyes (44.5%) right eye; 57 eyes (51.8%) nasal quadrant

7. Results Histopathologic classification of all lesions Pathologic Diagnosis No eyes (%) Recurrence by group (%) Benign lesions (n=40) Actinic keratosis Papilloma Pseudoepitheliomatous hyperplasia 21 (52.5%) 17 (42.5%) 2 (5%) 0 (0%) 1 (2.5%) Total = 5% Preinvasive lesions (n=60) Mild dysplasia Moderate dysplasia Carcinoma in situ 10 (16.7) 7 (11.7%) 43 (71.6%) 2 (3.3%) 1 (1.6%) 14 (23.3%) Total=28.2% Invasive lesions (n=10) Squamous cell carcinoma 10 (100%) 0 (0%) Total= 0%

8. Results Hazards analysis of factors predictive of carcinoma in situ recurrence Univariate (n=43) Multiple model (n=37) HR (CI 95%)P valueHR (CI 95%)P value Age >=50 years Sex (Males) Nasal location Temporal location Corneal Extension Limbal extension Size ≥5 mm Edges with lesion Cryotherapy Interferon after surgery 1.71 (0.40-7.33) 1.88 (0.67-5.28) 0.45 (0.15-1.30) 1.41 (0.47-4.25) 1.30 (0.44-3.87) 2.72 (1.15-6.48) 1.23 (0.33-4.50) 2.49 (0.62-10.02) 1.03 (0.59-5.76) 3.25 (0.73-14.60) 0.472 0.230 0.139 0.530 0.632 0.023 0.750 0.199 - 0.123 3.23 (0.49-21.33) - 3.24 (1.09-9.67) - 3.45 (1.01-11.81) - 0.224 - 0.035 - 0.048 -

9. Conclusion Tumors with limbal involvement and positive margins were at high risk for recurrence Prospective randomized controlled surgical trials may help to provide further insight into the value of surgery in the treatment of OSSN in our population.