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Distinguishing Pigmented Skin Distinguishing Pigmented Skin Lesions and MelanomaLesions and Melanoma
Toby Maurer, MD
University of California, San Francisco
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Epidemiology of MelanomaEpidemiology of Melanoma
• Lifetime risk of an American developing melanoma– 1935: 1 in 1500
– 1980: 1 in 250
– 2002: 1 in 68
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Melanoma StatisticsMelanoma StatisticsNot an old person’s diseaseNot an old person’s disease
• 1 in 4 persons w/melanoma are under 40
• Most common cancer in women ages 25-29
• 2nd most common cancer for women age 30-34
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Risk FactorsRisk Factors• Red/blond hair• Family history of melanoma-specific gene mutations
found-testing for research purposes only• Sun exposure in childhood is risk factor• Intermittent sun exposure more important than total
lifetime exposure• Sun exposure PLUS genetics• Multiple nevi-typical and atypical in fair-skinned persons• Melanoma- Miller AJ-NEJM July 2006-good review re:
nevus to melanoma-what it takes
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Survival
• In 1940’s 5 year survival was 40%, now 90%
• Survival assoc. with tumor thickness-early detection is what has changed statistic not the treatment
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Melanoma Survival RatesMelanoma Survival Rates10-Year Survival Rates of
PatientsTumor thickness (mm) No ulceration Ulceration
0.01 to 1.00 92% 69%
1.10 to 2.00 78% 63%
2.01 to 4.00 60% 53%
> 4.00 55% 36%
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MelanomaMelanoma
• Clinical Features (ABCDE’s) – Asymmetry: bisected halves of lesion are NOT
identical
– Border: irregular, notched, vague
– Color: variegation of browns, red, blue, dark black
– Diameter: > 6mm in any dimension
– Evolution/enlargement: any change in nevus
• Melanoma may have 1 or more of the ABCDE’s
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Specific Types of Melanoma
• Lentigo maligna
• Nodular Melanoma
• Acral Melanoma
• Amelanotic Melanoma
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Doc, I’m here for a skin check
1)Personal or family history of melanoma
2) History of atypical nevus that has been removed
3) Presence of new or changing mole- i.e. change in size or color
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MelanomaMelanoma
• Melanoma may be INHERITED or occur SPORADICALLY
• 10% of melanomas are of the INHERITED type Familial Atypical Multiple Mole-Melanoma Syndrome (FAMMM)
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Risk Factors for Sporadic Risk Factors for Sporadic (Nonhereditary) Melanoma(Nonhereditary) Melanoma
• Numerous normal nevi, some atypical nevi
• Sun sensitivity, excessive sun exposure
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Clinical Features of FAMMMClinical Features of FAMMM
• Often numerous nevi (30-100+)• Nevi > 6mm in diameter• New nevi appear throughout life (after age
30)• Nevi in sun-protected areas (buttocks,
breasts of females)• Family history of atypical nevi and
melanoma
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• CDKN2A best understood of hereditary genes-67% lifetime risk of developing melanoma
• Testing not recommended outside research trials-penetrance not understood, role of outside factors, risk of other cancers not clearly defined, meaning of negative test
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Risk Categories (Lifetime Risk)Risk Categories (Lifetime Risk)
• Very low risk: pigmented races (Latino,African American ,Asian,etc.)
• Low risk: Caucasian = 1%
• Intermediate risk: Caucasian w/additional risk factors = 2% - 10%
• High risk: FAMMM Syndrome up to 100%
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PreventionPrevention
• Self examination for low-risk individuals
• Self examination and regular physician examination (yearly to every several years) for intermediate risk individuals
• Self examination and examination by a dermatologist every 3-12 months for FAMMM kindred
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Tools to improve the Art
• Photography- available at pigmented nevus centers• Involves mapping of nevi, far and close up photos• Set of photos for pt and provider• About $200.00• Dermoscopy-magnified view of lesion-a science
being developed and validated-needs lots of training; better developed in Europe
• Confocal microscopy-looking at lesions in the human at the bedside
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Genomic Hybridization
• Based on theory that with cancer there are alterations of the genome of the cancer cells
• DNA can be extracted from paraffin fixed blocks to assess the genome of the specimen
• Melanoma has specific alterations in genome and differs from nevi
• In cases where histology is difficult-this can be helpful
• Certain genomic alterations in melanoma may help stratify who is at higher risk for recurrence
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Differential DiagnosisDifferential Diagnosis
• Seborrheic keratosis
• Nevus, blue nevus, halo nevus
• Solar (senile) lentigo
• Pigmented BCC
• Dermatofibroma
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How to DiagnoseHow to Diagnose
• If melanoma is suspected, an excisional biopsy is recommended
• If the lesion is too large to excise, an incisional biopsy may be done to include any nodules, dark-black areas and white areas
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Why Excisional Biopsy?
• The diagnosis and prognosis of melanoma is dependent on the depth of the lesion
• Send your pathologist the whole thing
• Dermatopathologist or general pathologist?
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What to do if Melanoma
• Staging workup for melanomas > 0.7 mm
• Re-excise all melanomas with wider margins
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What to Do if Melanoma DxWhat to Do if Melanoma Dx
• Depth is key– < 0.7 *mm *- Close clinical f/u and labs– > 0.7 *mm* - CT scans of chest, pelvis, MRI/PET scan
brain & sentinel nodes to stage– Melanoma center at least once (or call for latest
guidelines)
– Prognositc Importance of Sentinel Lymph Node in Thin Biopsies of Melanoma-Ranier JM et al. Ann Surg Oncol July 2006
– Management of Cutaneous Melanomas-Tsao, et al. NEJM Sept 2004-good review
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If Melanoma:
• Re-excise area with larger surgical margins: size of re-excision dependent on the original depth of melanoma
• Original melanoma in-situ-Excise 0.5 cm margin• Original melanoma < 1 mm-Excise 1.0 cm margin• Original melanoma >1 mm-Excise 2.0 cm margin
• Coordinate with surgeon in the know and someone who can do nuclear scan/sentinal node at time of the re-excision if indicated.
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Primary care follow-up
• For the first two years after diagnosis-see patient back q 6 months for total body exam
• Looking for local recurrence, in-transit metastases, lymph node involvement and second melanomas.
• Q yr CBC, LFT’s including LDH for lymph node involvement or ulcerative lesion
• CXray-controversial
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Follow-up for Melanomas
• Second melanomas 1% after 1 year, 2% at 5 yrs, 3% at 10 yrs and 5% at 20 yrs-regular f/u for LIFE (Cancer 97,2003)
• Developing new risk trees for patients with thinner melanomas
• Also look for non-melanoma skin cancer and non-Hodgkin’s lymphoma (higher risk is those who had primary melanoma)
• Melanoma risk is 5 x’s higher in renal transplant recipients
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New Directions in Therapy
• Surgical excision is our therapy
• Very little to offer re: metastatic disease-6-9 month survival . Current chemo extends life to 1.3 yrs
• Rational therapy that targets genes and interrupts signalling pathways for metastases
Chudnovsky Y, Khavari P, Adams A. J. Clin Investigations April 2005
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Special CasesSpecial Cases
• Genital pigmented lesions
• Congenital nevi
• Pregnancy
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Genital Pigmented LesionsGenital Pigmented Lesions
• Follow the same rules as other pigmented lesions
• 15% had family history of melanoma
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Congenital NeviCongenital Nevi
• < 1 cm - 1% Lifetime risk of melanoma
• 1-5 cm - Unknown risk
• > 5 cm - 10% Lifetime risk
• Have congenital nevi evaluated once by a dermatologist
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PregnancyPregnancy
• Nevi change during pregnancy
• New ones appear
• Should people who have had melanoma get pregnant?– Depends on depth of melanoma
– Call Central Melanoma Center for advice
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