|Source||Humanized (from mouse)|
|Licence data||EMA: , US FDA:|
|Pregnancy cat.||C (US)|
|Legal status||POM (UK) ℞-only (US)|
|Half-life||Approx. 9 days|
| (what is this?)
Ranibizumab (trade name Lucentis) is a monoclonal antibody fragment (Fab) derived from the same parent mouse antibody as bevacizumab (Avastin). It is much smaller than the parent molecule and has been affinity matured to provide stronger binding to VEGF-A. It is an anti-angiogenic that has been approved to treat the "wet" type of age-related macular degeneration (AMD, also ARMD), a common form of age-related vision loss.
Ranibizumab sells for $1,593 per dose, compared to bevacizumab, which can be prepared for macular degeneration treatment in doses that cost $42. Clinical trials have shown both to be equally effective; however there were some reports of infection after dividing bevacizumab into smaller doses.
Mechanism of action 
Ranibizumab binds to and inhibits a number of subtypes of vascular endothelial growth factor A (VEGF-A). VEGF may trigger the growth of new vessels, which may leak blood and fluid into the eye. These leaky blood vessels may contribute to macular edema and choroidal neovascularization, resulting in the wet type of AMD.
By blocking VEGF-A in the eye, ranibizumab may prevent and reverse vision loss caused by wet macular degeneration.
Clinical Indications 
|This section does not cite any references or sources. (January 2011)|
The drug is injected intravitreally (into the vitreous humour of the eye) once a month. If monthly injections are not feasible, the regimen may be reduced to 1 injection every 3 months after the first 4 months.
However, dosing every 3 months is linked to a loss of approximately 5 letters (1 line) in visual acuity for the following 9 months as compared with dosing on a monthly basis. Large phase 3 clinical trials (MARINA and ANCHOR) which randomized patients with wet macular degeneration showed that 95% of ranibizumab-treated patients maintained visual acuity compared with 62% of those administered placebo (P < .01) at 1 year; moreover, up to 40% demonstrated an improvement in vision of at least 3 lines. Vision maintenance and loss were defined as a loss of less than 15 letters and a gain of 15 or more letters in visual acuity, respectively, as measured using the Early Treatment of Diabetic Retinopathy eye chart.
Side effects 
Although there is a theoretical risk for arterial thromboembolic events in patients receiving VEGF-inhibitors by intravitreal injection, the observed incidence rate was low (< 4%) and similar to that seen in patients randomized to placebo.
Serious adverse events related to the injection procedure occurred with an incidence rate of less than 1% and included endophthalmitis, retinal detachment, and traumatic cataracts. Other serious ocular adverse events observed among ranibizumab-treated patients (incidence rate < 1%) included intraocular inflammation and blindness.
Drug Interactions 
No significant interactions are known. 
On November 3, 2010, The New York Times reported that Genentech began offering secret rebates to about 300 ophthalmologists in an apparent inducement to get them to use more ranibizumab rather than their less expensive bevacizumab. This may have been in anticipation of the results of the CATT clinical trial, which was sponsored by the National Eye Institute, and compared the relative safety and efficacy of ranibizumab and bevacizumab in treating AMD. Some retina specialists consider the tactic bribery. In 2008, bevacizumab cost Medicare only $20 million for about 480,000 injections, while ranibizumab cost Medicare $537 million for only 337,000 injections. A small study showed no superior effect of ranibizumab versus bevacizumab in direct comparison. The CATT trial data was published in the New England Journal of Medicine in May 2011. The trial showed that the two drugs "had equivalent effects on visual acuity when administered according to the same schedule". The authors also concluded that differences in the rates of side effects required further study.
- Lucentis Prescribing Information. Genentech. June 2010.
- Alicia Mundy (June 17, 2010). "Medicare Eye Study Finds Untapped Savings". The Wall Street Journal.
- Tufail, A.; Patel, P. J.; Egan, C.; Hykin, P.; Da Cruz, L.; Gregor, Z.; Dowler, J.; Majid, M. A. et al. (2010). "Bevacizumab for neovascular age related macular degeneration (ABC Trial): multicentre randomised double masked study". BMJ 340: c2459–c2459. doi:10.1136/bmj.c2459.
- Lucentis Fact Sheet. Genentech.
- Haberfeld, H, ed. (2009). Austria-Codex (in German) (2009/2010 ed.). Vienna: Österreichischer Apothekerverlag. ISBN 3-85200-196-X.[page needed]
- Ranibizumab, Lexi-Drugs. Ranibizumab. Lexi-Comp, Inc; 2007.
- Andrew Pollack (November 3, 2010). "Genentech Offers Secret Rebates for Eye Drug". The New York Times.
- Subramanian, M L; Abedi, G; Ness, S; Ahmed, E; Fenberg, M; Daly, M K; Houranieh, A; Feinberg, E B (2010). "Bevacizumab vs ranibizumab for age-related macular degeneration: 1-year outcomes of a prospective, double-masked randomised clinical trial". Eye 24 (11): 1708–1715. doi:10.1038/eye.2010.147. PMID 20885427.
- Catt Research, Group; Martin, DF; Maguire, MG; Ying, GS; Grunwald, JE; Fine, SL; Jaffe, GJ (2011). "Ranibizumab and Bevacizumab for Neovascular Age-Related Macular Degeneration". New England Journal of Medicine 364 (20): 1897–1908. doi:10.1056/NEJMoa1102673. PMC 3157322. PMID 21526923.
- Official website Genentech