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   Table of Contents      
COMMENTARY
Year : 2019  |  Volume : 67  |  Issue : 6  |  Page : 969-970

Commentary: Antivascular endothelial growth factor and retinopathy of prematurity


Mumbai Retina Centre, Santacruz, Mumbai, Maharashtra, India

Date of Web Publication24-May-2019

Correspondence Address:
Prof. Ajay Indur Dudani
Mumbai Retina Centre, 101, Kirtimanor Bldg, S V Road, Santacruz West, Mumbai - 400 054, Maharashtra
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijo.IJO_1220_17

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How to cite this article:
Dudani AI, Dudani A, Dudani K. Commentary: Antivascular endothelial growth factor and retinopathy of prematurity. Indian J Ophthalmol 2019;67:969-70

How to cite this URL:
Dudani AI, Dudani A, Dudani K. Commentary: Antivascular endothelial growth factor and retinopathy of prematurity. Indian J Ophthalmol [serial online] 2019 [cited 2019 Aug 24];67:969-70. Available from: http://www.ijo.in/text.asp?2019/67/6/969/259015



Endophthalmitis following intravitreal antivascular endothelial growth factor (VEGF) drugs is sufficiently rare,[1] but it is unfortunate if occurs bilaterally in premature infants receiving bevacizumab for retinopathy of prematurity (ROP). Although the bevacizumab eliminates the angiogenic threat (BEAT)-ROP study has proven the use of bevacizumab for the use in Zone 1 and posterior Zone 2 ROP, it was underpowered for safety analysis.[2] Many studies have pointed to the immediate and long-term complications of bevacizumab, including recurrence of ROP, vitreous hemorrhage, progression of retinal detachment, rapid myopia progression, and systemic effects such as bowel ischemia and neurodevelopmental delays.[3],[4] A recent Cochrane review concluded that insufficient data preclude strong conclusions favoring routine use of intravitreal anti-VEGF agents in preterm infants with Type 1 ROP.[5] Developing countries like India which are seeing the mushrooming of neonatal Intensive Care Units (ICUs) may witness an epidemic of ROP due to increasing survival rates of extremely preterm infants born even as early as 24 weeks' gestation.[6] These facts may lead to greater use of intravitreal bevacizumab for treating aggressive posterior ROP (APROP) (Type 1 ROP), with associated complications.

Laser has its own advantages in treating ROP and is still the preferred modality of treatment in ROP involving Zone II anterior and Zone III disease. It can be completed in one sitting, and if done well, it leads to regression of ROP within 6 weeks. Compared to bevacizumab, recurrence rates of ROP are markedly lesser with laser, at follow-up of 5 years, thus avoiding need for periodic evaluation till complete vascularization, as required with bevacizumab.[4] The disadvantages of laser in ROP include a long learning curve, the risk of sedation, and relatively longer duration to complete the laser sitting. In addition, the early treatment ROP trial showed that in Type 1 and Zone 1 ROP, 30% patients had unfavorable outcome.[7] The disease in Zone 1 leads to ablation of almost two-third of the retinal periphery leading to field restriction, inflammation a high incidence of myopia.[8]

The advantages of anti-VEGF injections in ROP are that injections can be administered quickly in both eyes under mild sedation. The procedure can be done on the bedside in the neonatal ICU if required. The response to anti-VEGF injections is rapid with the plus disease disappearing within a day and the vitreous haze clearing with the progression of normal vascularization. However, the ophthalmologist needs to be trained to follow-up these children till the vascularization progresses up to the ora serrata. It is advisable to periodically monitor these children, preferably with photographic documentation, and take them up for laser ablation if vascularization ceases to progress for >2 weeks or if there is development of Stage 3 disease. A caveat is that it may take up to 60–70 weeks' gestational age for the vascularization to complete; hence, careful observation is mandatory until this occurs. It is challenge to examine bigger babies who may require sedation to allow thorough peripheral retinal evaluation.

The risks of the anti-VEGF should not be forgotten as this paper on endophthalmitis highlights (REF IJO paper).[9] Fortunately, there have been very few such cases reported in literature thus far,[10] yet examining clinician should look for signs of infection at every visit in these premature babies.

Anti-VEGF is a double-edged sword as the neural, vascular, lung dependent of these neonates is driven by the VEGF.[11] The long-term effects of these drugs in infants are unknown, and the use of off-label drugs in these infants can lead to litigation and should always be born in mind. The other big conundrum is which drug and what dose to choose. Avastin has the advantage of low cost but it leaks into the systemic circulation for almost 2 weeks. Ranibizumab has the advantage of shorter half-life and hence reduces the systemic side effects but there is a chance of recurrence of ROP.

The dosage in BEAT ROP for bevacizumab was half of the adult dose 0.625 mg (10,000 higher than the amount of VEGF in the vitreous of these small infants). Hence, a de-escalation dose study needs to be done to see therapeutic effects of 0.25 mg of avastin. There has been a surge in the various ROP trials published; they all have shown meaningful structural regression rates of ROP. Almost 700 infants and 1400 eyes have been treated in these trials from 2012 to 2017. However, as doctors, we should remember our motto of primum non nocere before embarking on treatment. The importance of informed consent cannot be emphasized more in ROP as anti-VEGF use is an off-label use; hence, we need to take the parents in confidence and have a detailed discussion about both the pros and cons of both laser and anti-VEGF. Reactivation of disease, crunch phenomena postinjection, and systemic implications of anti-VEGF with the need for longer follow-up should be clearly described to the parents.

Hence, the anti-VEGF consensus stands as it should not be used as a primary treatment of ROP but be reserved for cases of APROP (i.e., Type 1 ROP) where laser is not possible due to poorly dilating pupils and vitreous haze. Or it can be used after laser in APROP cases where there is a high risk for retinal detachment progression and where there is a risk to foveal development and the disease is recalcitrant.

In the future, laser might not necessarily remain the gold standard indefinitely, especially for posterior progressing and asymmetric ROP. However, the questions remain such as should anti-VEGF be used in the Zone 2 ROP, use it before or after laser, is earlier better, and what is the lowest safe dose.



 
  References Top

1.
Jain P, Sheth J, Anantharaman G, Gopalakrishnan M. Real-world evidence of safety profile of intravitreal bevacizumab (Avastin) in an Indian scenario. Indian J Ophthalmol 2017;65:596-602.  Back to cited text no. 1
[PUBMED]  [Full text]  
2.
Mintz-Hittner HA, Kennedy KA, Chuang AZ; BEAT-ROP Cooperative Group. Efficacy of intravitreal bevacizumab for stage 3+retinopathy of prematurity. N Engl J Med 2011;364:603-15.  Back to cited text no. 2
    
3.
Jalali S, Balakrishnan D, Zeynalova Z, Padhi TR, Rani PK. Serious adverse events and visual outcomes of rescue therapy using adjunct bevacizumab to laser and surgery for retinopathy of prematurity. The Indian twin cities retinopathy of prematurity screening database report number 5. Arch Dis Child Fetal Neonatal Ed 2013;98:F327-33.  Back to cited text no. 3
    
4.
Hwang CK, Hubbard GB, Hutchinson AK, Lambert SR. Outcomes after intravitreal bevacizumab versus laser photocoagulation for retinopathy of prematurity: A 5-year retrospective analysis. Ophthalmology 2015;122:1008-15.  Back to cited text no. 4
    
5.
Sankar MJ, Sankar J, Chandra P. Anti-vascular endothelial growth factor (VEGF) drugs for treatment of retinopathy of prematurity. Cochrane Database Syst Rev 2018;1:CD009734.  Back to cited text no. 5
    
6.
Support Study Group of the Eunice Kennedy Shriver NICHD Neonatal Research Network, Carlo WA, Finer NN, Walsh MC, Rich W, Gantz MG, et al. Target ranges of oxygen saturation in extremely preterm infants. N Engl J Med 2010;362:1959-69.  Back to cited text no. 6
    
7.
Good WV; Early Treatment for Retinopathy of Prematurity Cooperative Group. Final results of the early treatment for retinopathy of prematurity (ETROP) randomized trial. Trans Am Ophthalmol Soc 2004;102:233-48.  Back to cited text no. 7
    
8.
Geloneck MM, Chuang AZ, Clark WL, Hunt MG, Norman AA, Packwood EA, et al. Refractive outcomes following bevacizumab monotherapy compared with conventional laser treatment: A randomized clinical trial. JAMA Ophthalmol 2014;132:1327-33.  Back to cited text no. 8
    
9.
Chandra P, Kumawat D, Tewari R, Azimeera S. Post-Ranibizumab injection endophthalmitis in aggressive posterior retinopathy of prematurity. Indian J Ophthalmol 2019;67:967-9.  Back to cited text no. 9
  [Full text]  
10.
Wang J, Xiang D. Early clinical characteristics of bacterial endophthalmitis in retinopathy of prematurity after intravitreal bevacizumab injection: A case report. Exp Ther Med 2017;13:3563-6.  Back to cited text no. 10
    
11.
McGillick EV, Orgeig S, Morrison JL. Structural and molecular regulation of lung maturation by intratracheal vascular endothelial growth factor administration in the normally grown and placentally restricted fetus. J Physiol 2016;594:1399-420.  Back to cited text no. 11
    




 

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