Multimodal approach – Conjunctival melanoma
Conjunctival melanoma is a rare and potentially aggressive cancer arising from melanocytes in the conjunctiva (the thin membrane covering the white part of the eye and inner eyelids). Treatment typically involves a multimodal approach, combining surgery, cryotherapy, and in some cases, radiotherapy or immunotherapy. Here’s what to expect:
1
Diagnosis and Pre-Treatment Evaluation
Diagnostic Workup
- Slit-lamp exam and high-resolution photography are used to assess lesion size and characteristics.
- A biopsy is performed to confirm the diagnosis and determine the type and depth of melanoma.
- Imaging (like MRI or ultrasound) may be used to check for orbital involvement.
- A systemic workup (PET/CT, chest X-ray, blood work) helps rule out metastasis.
Tumor Mapping
- The extent of conjunctival involvement is mapped.
Pigmentation, nodularity, and feeder vessels are documented to guide treatment planning.
2
Primary Treatment – Surgical Excision
“No Touch” Surgical Technique
- Wide local excision is done under anesthesia with extreme care to avoid tumor cell spread.
- A safety margin (typically 2–4 mm) of surrounding healthy conjunctiva is removed.
- Double freeze-thaw cryotherapy is applied to the conjunctival margins to destroy residual microscopic cells.
Adjuvant Therapy at Time of Surgery
- Mitomycin C (MMC) drops may be applied post-operatively to prevent recurrence.
- In some cases, alcohol-assisted epitheliectomy is performed if the melanoma involves the cornea.
3
After Surgery – Adjuvant and Follow-Up Therapies
Topical Chemotherapy
- Mitomycin C (MMC) or Interferon alpha-2b eye drops may be prescribed:
- Typically used in cycles (e.g., 1 week on, 1 week off for 4–6 weeks).
- Close monitoring for toxicity (redness, irritation, punctate keratopathy) is essential.
Radiation Therapy
- Plaque brachytherapy or proton beam radiation may be used for incomplete excision or high-risk cases.
- External beam radiation is reserved for orbital extension or recurrence.
Sentinel Lymph Node Biopsy
- May be performed for tumors with high-risk features (e.g., thickness >2mm, non-limbal location).
- Helps detect early lymphatic spread.
4
Long-Term Monitoring and Prognosis
Regular Follow-Up
- Close surveillance every 3–6 months with:
- Eye exams
- Conjunctival and lymph node inspection
- Imaging as needed
Recurrence Risk
- Local recurrence occurs in 20–50% of cases.
- Lifelong monitoring is essential due to risk of metastasis to lymph nodes, lungs, liver, or brain.
5
Side Effects and Risks
Short-Term
- Pain, swelling, redness following surgery or topical treatment.
- Dry eye or discomfort from mitomycin C or interferon drops.
Long-Term
- Scarring of the conjunctiva.
- Limbal stem cell deficiency in severe cases.
- Vision changes depending on location and treatments used.
6
Emotional and Lifestyle Considerations
- Facial appearance changes can be emotionally distressing—reconstructive surgery or cosmetic options may be discussed.
- Psychological support and patient advocacy (like A Cure In Sight) are key to coping with diagnosis and treatment.
- Sun protection (sunglasses, hats) and UV avoidance are recommended to reduce risk of further pigment cell damage.