Two-Year Outcomes After Variable Duration of Drug Cessation in Patients With Maculopathy Associated With Pentosan Polysulfate Use

Abstract

Prior retrospective studies have provided limited evidence on disease progression following drug cessation in patients with maculopathy associated with pentosan polysulfate (PPS). To evaluate the 2-year evolution of maculopathy associated with PPS use after drug cessation. This cohort study prospectively evaluated the natural history of patients with maculopathy associated with PPS use. Participants seen at the Emory Eye Center were enrolled between December 1, 2018, and December 1, 2019, and data were collected through November 30, 2021. The main outcomes were changes in visual function and structure. Visual function was assessed annually with refraction and Early Treatment Diabetic Retinopathy Study (ETDRS) best-corrected visual acuity (BCVA), mesopic microperimetry, and dark adaptometry. Structural outcomes included presence and extent of complete retinal pigment epithelium and outer retinal atrophy (cRORA), macular central subfield thickness (CST), and subfoveal choroidal thickness (SFCT). Of the 12 participants (23 eyes), 11 (91.7%) were female (1 [8.3%] male), 11 (91.7%) were White (1 [8.3%] Black), and median (IQR) age at enrollment was 58 (47-64) years. Median (IQR) time from PPS discontinuation to initial visit was 0.6 (0.4-1.9) years. Median baseline ETDRS BCVA letter score was 83 (Snellen equivalent, 20/20) (IQR, 80-86.5 [20/25-20/20]), with a median 2-year change of -3 (IQR, -6 to -0.5; P = .08). Four eyes (17.4%) had a letter score decline of 15 or more, all associated with progressive cRORA. Median change in microperimetry average threshold was -3.5 dB (IQR, -4.1 to -2.5 dB; P = .001), and percent reduced threshold was 32.5% (IQR, 20.3%-52.8%; P = .004). Nine eyes (39%) had macular cRORA at baseline, with a median linearized growth rate of 0.23 mm/y (IQR, 0.22-0.25 mm/y). Two eyes (8.7%) without atrophy at baseline developed new-onset cRORA. Median baseline CST was 284 μm (IQR, 253-291 μm), with a median 2-year change of -5 μm (IQR, -13 to 0.5 μm; P = .0497). Median 2-year change in SFCT was 1 μm (IQR, -18 to 16 μm; P = .91). The findings of this cohort study suggest that functional and structural deficits continue to progress in PPS-associated maculopathy even after drug cessation. Additional study is needed to determine whether these findings can be generalized to other patients with PPS-associated maculopathy and whether longer follow-up could determine subsequent disease course.