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Anti-cancer drugs for ophthalmic use

Anti-cancer drugs for ophthalmic use play a vital role in the management of eye tumors, ocular surface neoplasia, and intraocular malignancies. These medications are specially formulated for topical, periocular, intravitreal, or systemic administration depending on the type and stage of the disease. In ophthalmology, chemotherapy helps preserve vision, control tumor growth, and reduce the need for invasive surgery.

1. Mitomycin-C (MMC)

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Mitomycin-C is an alkylating antineoplastic antibiotic widely used in ophthalmology, especially for ocular surface tumors. It inhibits DNA synthesis, preventing cancer cell proliferation. MMC is commonly applied topically in cycles under specialist supervision.

Clinical Uses

  • Ocular Surface Squamous Neoplasia (OSSN)

  • Conjunctival intraepithelial neoplasia

  • Adjunct therapy after pterygium excision (to prevent recurrence)

  • Conjunctival melanoma (adjunctive)

Key Points

  • Usually prepared in concentrations of 0.02%–0.04%

  • Applied in cycles (1–2 weeks on/off)

  • Requires monitoring for corneal toxicity

  • Can cause irritation, epitheliopathy, or limbal stem cell deficiency

2. 5-Fluorouracil (5-FU)

5-Fluorouracil (5-FU) is an antimetabolite that interferes with DNA synthesis by inhibiting thymidylate synthase. It is commonly used as a topical chemotherapy agent for ocular surface malignancies.

Clinical Uses

  • Ocular Surface Squamous Neoplasia (OSSN)

  • Conjunctival carcinoma in situ

  • Adjunct in glaucoma filtering surgery (to prevent scarring)

Key Points

  • Typically used as 1% topical drops

  • Applied in cycles similar to Mitomycin-C

  • Less toxic than MMC but still requires follow-up

  • Side effects include redness, irritation, and punctate keratitis

3. Interferon Alpha-2b

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Interferon Alpha-2b is an immunomodulatory agent that enhances the body’s immune response against tumor cells. It is considered a safer alternative for treating ocular surface tumors.

Clinical Uses

  • Ocular Surface Squamous Neoplasia

  • Conjunctival papilloma

  • Early conjunctival melanoma (adjunctive)

Key Points

  • Available as topical drops or subconjunctival injections

  • Fewer ocular surface side effects compared to MMC

  • Longer treatment duration (may take several weeks to months)

  • Minimal systemic absorption

4. Melphalan (Intravitreal Chemotherapy)

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Melphalan is an alkylating chemotherapeutic agent primarily used in intravitreal injections for retinoblastoma. It directly targets vitreous tumor seeds while preserving the globe.

Clinical Uses

  • Retinoblastoma with vitreous seeding

  • Recurrent intraocular tumors

Key Points

  • Administered via intravitreal injection

  • Requires strict safety protocol to prevent extraocular spread

  • Can cause retinal toxicity if dosage is excessive

  • Highly effective in globe salvage therapy

5. Carboplatin

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Carboplatin is a platinum-based chemotherapeutic agent commonly used in systemic or intra-arterial chemotherapy for retinoblastoma. It inhibits DNA replication, leading to cancer cell death.

Clinical Uses

  • Retinoblastoma (systemic chemotherapy)

  • Intra-arterial chemotherapy protocols

Key Points

  • Often combined with vincristine and etoposide

  • Requires monitoring for bone marrow suppression

  • Effective in tumor size reduction

  • Helps avoid enucleation in early stages

6. Topotecan

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Topotecan is a topoisomerase I inhibitor used in retinoblastoma management. It can be given systemically, intra-arterially, or intravitreally depending on the treatment protocol.

Clinical Uses

  • Advanced retinoblastoma

  • Refractory vitreous seeds

Key Points

  • Alternative to melphalan in selected cases

  • Used in combination chemotherapy

  • Requires hematologic monitoring

  • Improves ocular salvage rates

Conclusion

Anti-cancer drugs for ophthalmic use are essential in modern ocular oncology. From topical agents like Mitomycin-C and 5-Fluorouracil to intravitreal chemotherapy such as Melphalan, these medications provide effective tumor control while preserving vision. Early diagnosis and specialist-guided therapy significantly improve outcomes in conditions like ocular surface neoplasia and retinoblastoma.

For optimal results, all treatments must be administered under the supervision of an ophthalmologist specialized in ocular oncology.