title: Orbital tumors in USA: difference in survival patterns.
abstract: BACKGROUND
  There is a wide range of tumors affecting the orbital adnexa. Key such tumors include lymphomas, carcinomas, melanomas and rhabdomyosarcomas. Several studies have proposed that these histological subtypes differ in their survival outcomes. In this study we aim to describe the difference in survival outcomes between such subtypes.
  
  
  METHODS
  The SEER database was used to gather patient information. All 18 SEER registries were used. Patients diagnosed from 1996 to 2005 were included in the analysis. Observed five-year survival rate was calculated using the SEER*Stat software version 8.1.2. Data were extracted into IBM SPSS version 20 to generate Kaplan Meier curve for each group.
  
  
  RESULTS
  There were 2180 patients in the SEER databases who met the selection criteria. Lymphomas were the most common histology in adults. The overall five-year observed survival for all lymphoma patients was 75.9% (95% CI: 73.7-78.1). There was statistically significant difference between observed survival rates of lymphoma subtypes. Carcinomas were the second most common tumors. Their five-year observed survival rate in our study was 60.4%. There was no statistically significant difference between carcinoma subtypes' observed survival rates in the 20-49 age group, while, in the older age group, the difference was found to be statistically significant. Rhabdomyosarcomas were the most common tumors in children. The overall five-year observed survival rate for rhabdomyosarcomas patients was 89.8%. There was no statistically significant difference between observed survival rates of rhabdomyosarcomas subtypes. There was no statistically significant difference between relative survival rates according to gender and treatment received except within melanomas.
  
  
  CONCLUSIONS
  In adults, lymphomas have better survival rates than carcinomas. Whereas the lymphoma subtype can be used as a determinant prognostic factor in any age, the carcinoma subtype can be used as such a determinant in older age groups only. In children, rhabdomyosarcomas are the predominant tumors affecting the orbital adnexa. Further studies are needed to determine if the difference between embryonal rhabdomyosarcoma and alveolar rhabdomyosarcoma observed survival rates are statistically significant.
authors: Department of Research, Children's Cancer Hospital Egypt 57357, Cairo, Egypt. Electronic address: Waleed.magdy.91@gmail.com.
authors: Waleed M
authors: WM
authors: Hassan
authors: Department of Research, Children's Cancer Hospital Egypt 57357, Cairo, Egypt; Cairo University School of Medicine, Cairo, Egypt; Ulm University, 89069 Ulm, Baden-Württemberg, Germany. Electronic address: ahmadsfar@gmail.com.
authors: Ahmad S
authors: AS
authors: Alfaar
authors: Department of Research, Children's Cancer Hospital Egypt 57357, Cairo, Egypt. Electronic address: msabrybakry@gmail.com.
authors: Mohamed S
authors: MS
authors: Bakry
authors: Department of Research, Children's Cancer Hospital Egypt 57357, Cairo, Egypt; National Liver Institute, Menoufiya University, Shebin Elkom, Egypt. Electronic address: Sameera.ezzat@57357.com.
authors: Sameera
authors: S
authors: Ezzat
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D005134:Eye Neoplasms / Q000453:epidemiology* / Q000473:pathology; D005260:Female; D006801:Humans; D007223:Infant; D008223:Lymphoma / Q000453:epidemiology* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009918:Orbital Neoplasms / Q000453:epidemiology* / Q000473:pathology; D011379:Prognosis; D012042:Registries; D012208:Rhabdomyosarcoma / Q000453:epidemiology* / Q000473:pathology; D018426:SEER Program; D015996:Survival Rate; D014481:United States / Q000453:epidemiology; D055815:Young Adult
keywords: Carcinoma; Lymphoma; Melanoma; Orbit; Rhabdomyosarcoma; SEER; Survival