Results
During the study period, 228 patients with OPG were identified. Of
these, 134 received treatment, 38 of whom received BBT. Eleven patients
were excluded due to incomplete ophthalmologic records, and 6 were
excluded due to early discontinuation of BBT secondary to intolerance.
An additional 4 were excluded due to young age at treatment initiation
and inability to complete quantifiable VA assessments. The remaining 17
patients were included in the study analysis.
Demographic and clinical information for each patient is displayed in
Table 1. Median age was 5.6 years (IQR 2.6-8.8 years) at OPG diagnosis
and 7.9 years (IQR 3.8-12.8 years) at BBT initiation. Fourteen had
sporadic OPG and 3 had NF1. All but one patient had prior treatment
failure, and 9 had multiple prior treatment failures. Indications for
BBT included radiographic progression alone (N=11), vision decline alone
(N=2), and both radiographic progression and vision decline (N=4).
Median follow-up time at last vision assessment was 12.9 months (IQR
11.0-16.6 months).
At baseline, 15 of 17 patients had impairment in VA, VF, or both
(displayed by-eye in Figure 1). Ten of 17 patients had at least moderate
VA impairment and 8 of 9 patients with evaluable VF had defects at
baseline.
Following BBT, 14 of 17 (82%) had stable or improved VA and 6 of 9
(67%) had stable or improved VF. Among the 6 patients with vision
decline as the indication for BBT, all but one experienced vision
stabilization or improvement in both VA and VF (Table 1). VA and VF
outcomes were discordant in 2 patients. Eight (47%) patients had
radiographic progression during BBT, 5 of whom had stable vision at time
of progression. Vision and radiographic outcome were discordant in 7/17
(41%).