Corneal Epitheliopathy Associated With Antibody-Drug Conjugates

Sanjay V. Patel, MD, FRCOphth, and Lauren A. Dalvin, MD
MEDICAL IMAGE

This report highlights corneal epithe- lial changes in 3 patients receiving different antibody-drug conjugate
(ADC) therapies that inhibit tubulin assem- bly: anetumab ravtansine for malignant pleural mesothelioma (Figure A), ado- trastuzumab emtansine for human epidermal growth factor receptorepositive ductal carcinoma of the breast (Figure B), and belantamab mafodotin for refractory myeloma (Figures C and D). The ADCs are a novel approach for treating cancer by using targeted monoclonal antibodies to direct cytotoxic payloads to malignant cells while reducing systemic toxicity. Nevertheless, some ADCs cause 2 types of corneal
epitheliopathy that can coexist and be symp- tomatic.1-3 Microcystic intraepithelial changes (Figures A-C) presumably represent apoptotic epithelial cells and are caused by payload toxicity to the corneal epithelial stem cells,4 which reside at the peripheral corneal limbus and continually regenerate the epithelium. Because new corneal epithe- lial cells migrate from the periphery to the center, microcystic epitheliopathy begins in the peripheral cornea (Figure A) before affecting the center (Figures B and C). Su- perficial punctate epitheliopathy (Figure D) results from tear film dysfunction and is common, although typically mild, with many oncological treatments; rarely, it may
From the Department of Ophthalmology, Mayo Clinic, Rochester, MN.

Microcystic corneal epitheliopathy begins in a peripheral annular distribution (A) and gradually encroaches on the center (B [retroillumination photography] and C). Superficial punctate epitheliopathy may also occur and is detected by fluorescein staining (D).

Mayo Clin Proc. ■ July 2021;96(7):2001-2002 ■ https://doi.org/10.1016/j.mayocp.2021.03.021 www.mayoclinicproceedings.org ■ ª 2021 Mayo Foundation for Medical Education and Research

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MAYO CLINIC PROCEEDINGS
proceed to corneal ulceration. Both types of epitheliopathy can cause blurred vision (especially if central) and photophobia, and superficial epitheliopathy can cause ocular surface discomfort. Symptoms and signs gradually resolve after withholding or dis- continuing treatment,3,5 and the microcystic changes are replaced by regenerated normal epithelium. Although these corneal findings are most frequent with belantamab mafodo- tin, which requires an ophthalmic examina- tion prior to every treatment, patients with ocular symptoms receiving similar ADCs should be assessed for corneal changes.

Potential Competing Interests: Dr Patel is a consultant to GlaxoSmithKline plc, Senju Pharmaceutical Co, Ltd, Santen Inc, and Emmecell. Dr Patel is not responsible for prescribing belantamab mafoditin, which is made by GlaxoSmithKline, but he does manage the associated corneal epitheliopathy. Dr Dalvin reports no competing interests.
Correspondence: Address to Sanjay V. Patel, MD, FRCOphth, Department of Ophthalmology, Mayo Clinic,
200 First St SW, Rochester, MN 55905 (Patel.Sanjay@ mayo.edu).
ORCID
Sanjay V. Patel: Image https://orcid.org/0000-0001-6694-1530; Lauren A. Dalvin: Imagehttps://orcid.org/0000-0001-9710- 4284

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