title: Short-Term Effects of Early Switching to Ranibizumab or Aflibercept in Diabetic Macular Edema Cases With Non-Response to Bevacizumab.
abstract: To study the effect of early switching to ranibizumab (Lucentis; Genentech, South San Francisco, CA) or aflibercept (Eylea; Regeneron, Tarrytown, NY) in cases of diabetic macular edema (DME) that have shown no response to bevacizumab (Avastin; Genentech, South San Francisco, CA).
  
  
  
  A retrospective study involving 59 eyes of 45 patients with DME previously treated with bevacizumab. Patients were switched either to ranibizumab or aflibercept. Detailed ophthalmological examination, best-corrected visual acuity (BCVA), and optical coherence tomography (Spectralis; Heidelberg Engineering, Heidelberg, Germany) were performed prior to and 1 month post-switch.
  
  
  
  Fifty-nine eyes of 45 patients were included in the study, of whom 14 patients (17 eyes) were switched to aflibercept and 31 patients (42 eyes) were switched to ranibizumab. Post-switch, there was a statistically significant improvement in the BCVA in the combined group (aflibercept and ranibizumab), as well as in the ranibizumab group alone. In addition, there was a statistically significant decrease in the central subfield thickness (CST) in the combined group, as well as in the ranibizumab and aflibercept groups individually. There was no significant difference with regard to the change in macular thickness or BCVA between the aflibercept and ranibizumab groups. In addition, neither the pre-switch central macular thickness, previous number of injections, nor the pre-switch visual acuity affected the response to switching.
  
  
  
  Aflibercept and ranibizumab both appear to be effective for patients showing no initial response to bevacizumab. [Ophthalmic Surg Lasers Imaging Retina. 2017;48:230-236.].
authors.forename: Mohammed
authors.initials: M
authors.lastname: Ashraf
authors.forename: Ahmed A R
authors.initials: AA
authors.lastname: Souka
authors.forename: Hassan
authors.initials: H
authors.lastname: ElKayal
mesh_terms: D020533:Angiogenesis Inhibitors / Q000008:administration & dosage; D000068258:Bevacizumab / Q000008:administration & dosage*; D003430:Cross-Sectional Studies; D003930:Diabetic Retinopathy / Q000150:complications / Q000175:diagnosis / Q000188:drug therapy*; D004305:Dose-Response Relationship, Drug; D057915:Drug Substitution; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D058449:Intravitreal Injections; D008269:Macular Edema / Q000175:diagnosis / Q000188:drug therapy* / Q000209:etiology; D008297:Male; D008875:Middle Aged; D000069579:Ranibizumab / Q000008:administration & dosage*; D040262:Receptors, Vascular Endothelial Growth Factor / Q000008:administration & dosage* / Q000037:antagonists & inhibitors; D011993:Recombinant Fusion Proteins / Q000008:administration & dosage*; D012189:Retrospective Studies; D013997:Time Factors; D041623:Tomography, Optical Coherence; D016896:Treatment Outcome; D014792:Visual Acuity
chemical_list: D020533:Angiogenesis Inhibitors; D011993:Recombinant Fusion Proteins; C533178:aflibercept; D000068258:Bevacizumab; D040262:Receptors, Vascular Endothelial Growth Factor; D000069579:Ranibizumab