Interferon is the only accepted adjuvant treatment for patients with melanoma; hence, oncologists should be aware of the possibility of retinal abnormalities resulting from its use. Interferon-associated retinopathy in patients being treated for resected melanoma is a rare phenomenon with a proposed immunological basis. Patients are usually asymptomatic or have mild visual impairments, with cotton wool infarcts and hemorrhages. These symptoms and signs usually resolve with the discontinuation of interferon, but in a few severe presentations the visual impairments and retinal changes can be irreversible. The Oncologist 2012; 17:384 -387
CASEA healthy, 35-year-old woman was receiving high-dose adjuvant interferon-␣2b (HD-IFN) for a resected stage 3a superficial spreading cutaneous malignant melanoma of the right arm. She had received induction treatment of 33 million units (20 million units/m 2 ) of HD-IFN i.v. 5 days per week for 4 weeks, and maintenance therapy of 16 million units (10 million units/ m 2 ) s.c. 3 days per week had been initiated for a planned total of 11 months. Four months into treatment, she presented with painless blurred vision inferotemporal to fixation in her left eye. Other than her new visual symptoms, she did not have any other significant side effects that would warrant discontinuing her treatment. Moreover, she denied any headache, fever, diplopia, or orbital pain. On examination, her vital signs, including blood pressure, were normal. Her cardiovascular, respiratory, and abdominal examinations were unremarkable. Her remaining cranial nerves and neurological examinations were unremarkable. She had mild anemia (hemoglobin, 114 g/L; hematocrit, 0.347 L/L) and no thrombocytopenia. She was referred urgently to an ophthalmologist for evaluation. Her central vision was 6/6 in each eye without correction. Pupil reactions were normal. Examinations of the anterior segments, anterior chambers, optic discs, and retinal vasculature were all normal. Color vision was not tested. There were cotton wool infarcts between the optic disc and fovea in the left eye and along the superotemporal arcades in both eyes (Fig. 1A and 1B, arrows). There was a paracentral scotoma on Amsler grid testing in the left eye. The etiology of the retinopathy was felt to be associated with her HD-IFN and she was instructed to stop the agent immediately. Three weeks later, there was a marked reduction in the cotton wool spots (Fig. 1C and 1D, arrows), and by 10 weeks they had almost completely resolved. The left eye scotoma had also resolved.
DISCUSSIONHD-IFN has been the standard adjuvant treatment for melanoma since researchers first demonstrated that it could produce longer relapse-free survival (RFS) and overall survival (OS)