Journal of Neuro-Ophthalmology:
Novel Treatment for Radiation Optic Neuropathy With Intravenous Bevacizumab
Farooq, Osman MD; Lincoff, Norah S. MD; Saikali, Nicolas MD; Prasad, Dheerendra MD, MCh (Neurosurgery); Miletich, Robert S. MD, PhD; Mechtler, Laszlo L. MD
School of Medicine (OF, NSL, NS, DP, RSM, LLM), Departments of Neurology (OF, NSL, NS, LLM), Ophthalmology (NSL), Radiation Medicine (DP), and Nuclear Medicine (RSM), University of Buffalo, Buffalo, New York
Jacobs Neurologic Institute (OF, NSL), Buffalo, New York
Women and Children's Hospital of Buffalo (OF), Buffalo, New York
Ross Eye Institute (NSL), Buffalo, New York
Dent Neurologic Institute (NS, RSM, LLM), Buffalo, New York
Roswell Park Cancer Institute (DP, LLM), Buffalo, New York.
Address correspondence to: Norah S. Lincoff, MD, Jacobs Neurologic Institute, Buffalo General Hospital, 100 High Street, Buffalo, NY 14203; E-mail: email@example.com
The authors have no funding or conflicts of interest to declare.
Abstract: Radiation optic neuropathy is a devastating form of vision loss that can occur months to years after radiation therapy for tumors and other lesions located in close proximity to the visual pathways. We present the case of a 24-year-old woman who underwent external beam radiation for treatment of a tectal pilocytic astrocytoma, and 5 years later she developed bilateral radiation optic neuropathy and radiation necrosis of the right temporal lobe. We opted to treat her with intravenous bevacizumab with 3 doses every 3 weeks, as well as dexamethasone and pentoxifylline. After the first infusion of bevacizumab, the patient noted improvement in vision and color vision, and a follow-up magnetic resonance imaging study showed that the previous enhancement of the optic nerves and chiasm was diminishing. Her vision improved dramatically and has remained stable over a 3-year period.
Radiation optic neuropathy (RON) typically leads to devastating vision loss in one or both eyes (1–3). Recently, there have been reports of anti–vascular endothelial growth factors used in the treatment of radiation damage, both in the eye (4–7) and the central nervous system (CNS) (8–11). We report the use of this therapeutic agent in a patient with RON.
A 26-year-old woman presented 10 years previously with headaches and somnolence. At that time, brain magnetic resonance imaging (MRI) revealed a tectal mass that was thought to be a pilocytic astrocytoma. Eight years ago, she developed obstructive hydrocephalus as a result of the growth of the tumor (Fig. 1). The patient underwent left ventriculostomy and resection of the tumor that confirmed the diagnosis. She received intensity-modulated radiation therapy of 54 Gy in 30 fractions at 1.8 Gy per fraction. Mean doses were as follows: right optic nerve 4.4 Gy (range: 1.2–10.3 Gy), left optic nerve 6.6 Gy (range: 2.8–10.4 Gy), and optic chiasm 24.8 Gy (range: 11.4–45.8 Gy). A Varian 21/CD linear accelerator using 6 MeV photons, with a 56 leaf (1-cm leaf width), multileaf collimator and sliding window technique was used (Fig. 2). Three months later, the patient underwent a second craniotomy for tumor recurrence, followed by treatment with carboplatin/vincristine chemotherapy for 15 months.
Five years and 3 months later, the patient reported headaches and vision loss in the right eye. She described her vision as “white.” Visual acuity was 20/80, right eye, and 20/40, left eye. Brain MRI showed a subcortical area of hyperintensity in the right temporal lobe (Fig. 3). This was thought to be consistent with radiation damage, and the patient was started on intravenous methylprednisolone for 5 days, followed by 4 mg of dexamethasone daily.
Two weeks later, optic nerve enhancement was noted bilaterally (Fig. 4), which also was felt to be caused by radiation damage. The dose of dexamethasone was increased to 4 mg twice daily. Visual acuity was no light perception, right eye, and 20/100, left eye. Positron emission tomography (PET) was consistent with inflammatory changes of radiation injury (Fig. 5).
Four weeks after the onset of visual loss, the patient was given 675 mg of intravenous bevacizumab (7.5 mg/kg) with 3 doses every 3 weeks, as well as 8 mg of dexamethasone per day and 400 mg of pentoxifylline per day. MRI scanning 2 weeks after initiating treatment with bevacizumab showed decreasing enhancement of the optic nerves and chiasm.
During the second week of treatment, the patient noted improvement in her visual acuity and reported periods of extreme clarity for 5 to 10 minutes at a time. Visual acuity was 20/50, right eye, and 20/100, left eye. The patient identified the color plates slowly, but correctly, in each eye. Pupils reacted poorly to light, and automated visual fields revealed a bitemporal hemianopia (Fig. 6A). Bilateral optic atrophy was present. Over the next 4 weeks, her subjective episodes of clarity increased to hours at a time, and she regained acuity of 20/25, right eye, and 20/40, left eye, with further improvement in her visual fields (Fig. 6B).
Six weeks after initiation of bevacizumab, brain MRI revealed complete resolution of the areas of enhancement (Fig. 7). With 3 years of follow-up, the patient's vision has stabilized at 20/20, right eye, and 20/25, left eye. Color vision is intact bilaterally. Subtle bitemporal visual field defects remain, and both optic discs are pale.
This report suggests that intravenous bevacizumab may be an effective treatment of RON. Our patient noted dramatic improvement in her vision within 4 weeks of initiation of therapy, and there was complete resolution of brain and optic nerve enhancement within 6 weeks. Over a 3-year period, her visual function has remained stable.
Bevacizumab has been reported to be effective in the treatment of radiation necrosis of the CNS. Gonzalez et al (8) demonstrated the benefit of using bevacizumab or bevacizumab with a chemotherapeutic agent (carboplatin, irinotecan, temozolomide) in 15 patients diagnosed with cerebral radiation necrosis. All patients showed improvement in both fluid-attenuated inversion recovery (FLAIR) and postcontrast T1 MRI abnormalities at an average of eight weeks after beginning bevacizumab. Torcuator et al (10) reported 6 patients with biopsy-proven cerebral radiation necrosis treated with bevacizumab between 2006 and 2008 and documented improvement in both FLAIR and contrast-enhanced T1 images. Levin et al (12) postulated that aberrant production of vascular endothelial growth factor is involved with radiation necrosis of the brain and that even short treatment (fewer than four doses) with bevacizumab seems to turn off the cycle of radiation damage. Levin et al (12) enrolled 14 patients into a placebo-controlled, randomized, double-blind study to evaluate the effect of bevacizumab in treating CNS radiation necrosis. In evaluating MRI findings, 0 of 7 patients receiving placebo responded, whereas all 5 of 5 randomized and 7 of 7 crossover patients showed regression of necrotic lesions. Only 2 patients had recurrence of MRI findings, and both were retreated with bevacizumab.
Adverse effects from systemic administration of bevacizumab include cardiovascular (hypertension, thromboembolism), CNS (headache, pain syndromes, tumor recurrence), gastrointestinal (abdominal pain, nausea, vomiting, anorexia), hematologic (hemorrhage, leukopenia, neutropenia), and musculoskeletal (weakness, myalgias) abnormalities (13–15). These adverse affects are fortunately rare, and none were observed in our patient.
Although pentoxifylline was part of our patient's treatment protocol, its therapeutic efficacy is unproven. This hemorrheologic methylxanthine derivative might increase tissue perfusion by reducing platelet aggregation and reduce cytokine-mediated inflammation by inhibiting tumor necrosis factor and fibroblast growth factor 2. Yet in a comprehensive review, Nieder et al (16) found “little evidence” that pentoxifylline has any significant effect on radiation therapy. We thus believe that it was the bevacizumab that was responsible for the patient's visual improvement.
We acknowledge that our findings will need to be confirmed in a randomized trial to determine the optimal duration and effectiveness of treatment in a large study group. However, in the interim, we recommend that bevacizumab be considered in patients suffering acute visual loss from RON.
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