Background
Melanoma is a malignancy of pigment-producing cells (melanocytes) located predominantly in the skin, but also found in the eyes, ears, GI tract, leptomeninges, and oral and genital mucous membranes. Melanoma accounts for only 4% of all skin cancers; however, it causes the greatest number of skin cancer–related deaths worldwide. Early detection of thin cutaneous melanoma is the best means of reducing mortality. Characteristic images are shown below.
Malignant melanoma. Courtesy of Hon Pak, MD.
Cutaneous melanoma with characteristic asymmetry, irregular borders, and color variation. Courtesy of Wendy Brick, MD. Pathophysiology
The sequence of events in which normal melanocytes transform into melanoma cells, referred to as melanomagenesis, is poorly understood. It likely involves a multistep process of progressive genetic mutations that (1) alter cell proliferation, differentiation, and death and (2) impact susceptibility to the carcinogenic effects of ultraviolet radiation.[1] Recent data suggest multiple pathways of melanoma pathogenesis, with melanomas in sun-protected skin (trunk) developing in association with a high nevus count and intermittent ultraviolet radiation as opposed to those developing on sun-exposed skin in patients with low nevus counts and chronic sun exposure.[2, 3]
Differences in frequency of BRAF or NRAS mutations are also related to patterns of sun exposure, with BRAF mutations more common in intermittently UV-exposed skin compared with chronically sun exposed skin or relatively unexposed skin (eg, acral sites, mucosal sites), which more frequently demonstrate KIT mutations.[3]
A meta-analysis by Lee et al demonstrated that the prevalence of these mutations may also depend on melanoma histologic subtype.[4]
Primary cutaneous melanoma may develop in precursor melanocytic nevi (ie, common, congenital, and atypical/dysplastic types), although more than 70% of cases are believed to arise de novo (ie, not from a preexisting pigmented lesion).
The development of melanoma is multifactorial and appears to be related to multiple risk factors, including fair complexion/sun sensitivity, excessive childhood sun exposure and blistering childhood sunburns, an increased number of common or atypical/dysplastic nevi (moles), a family history of melanoma, the presence of a changing mole or evolving lesion on the skin, and, importantly, older age.[5, 6, 7]
Epidemiology
Frequency
United States
The incidence of melanoma has more than tripled in the white population during the last 20 years, and melanoma currently is the sixth most common cancer in the United States. Approximately 70,230 Americans (40,010 men and 30.220 women) will develop invasive cutaneous melanoma in 2011, with an estimated additional 46,770 or more cases of melanoma in situ.[8] The incidence may be higher due to melanoma underreporting to cancer registries, particularly for tumors that are diagnosed and managed in the outpatient setting.[9] The current lifetime risk for developing invasive melanoma is 1 case per 57 Americans, a 2000% increase since 1930. This risk rises to 1 case per 33 Americans if noninvasive melanoma in situ is included.
Encouragingly, a stable-to-reduced melanoma incidence rate has been noted in younger age groups in the United States, which may be a result of primary prevention campaigns aimed at reducing excessive sun exposure over the past 30 or more years; however, the full impact of primary prevention strategies on melanoma incidence and mortality will not be apparent for several decades.
Of recent concern, however, is the rising melanoma incidence in Caucasian women younger than 40 years; this group has demonstrated a 50% increase in the annual incidence of melanoma from 1980-2004. Increased UV radiation exposure through tanning bed use, a World Health Organization (WHO)–classified carcinogen, has been proposed as a potential explanation for this alarming trend.[10] In addition, a study assessing melanoma incidence among young Caucasian girls and women (15-39 y) in California showed significantly higher incidence in those living in higher socioeconomic areas with the highest UV radiation exposure compared with those from lower socioeconomic neighborhoods, suggesting that affluence (and associated lifestyle behaviors) may have a bigger impact on melanoma risk than UV exposure alone.[11]
International
Melanoma incidence has continued to increase worldwide, with the highest incidence in Australia and New Zealand. The most recent analysis of global cancer statistics for melanoma, from 2002, demonstrated a prevalence of 37.7 cases per 100,000 men and 29.4 cases per 100,000 women in Australia and New Zealand, compared with 6.4 cases per 100,000 men and 11.7 cases per 100,000 women in North America.[12]
Mortality/Morbidity
While melanoma accounts for roughly 4% of all skin cancers, it is responsible for more than 73% of skin cancer deaths. In the United States, one person each hour dies from metastatic melanoma. Treatment of melanoma in its early stages provides the best opportunity for cure.
United States: An estimated 8790 deaths will occur in 2011 (5750 men and 3040 women).[8] Analysis of US Surveillance, Epidemiology, and End Results (SEER) data from 1969-1999 has demonstrated a disproportionate burden of melanoma deaths among middle-aged and older white men. While melanoma mortality rates have fallen 39% in women and 29% in men aged 20-44 years over this period, they have increased 66% in men aged 45-64 years and 157% in older men (≥65 y).[13] Incidence data generally parallel mortality data and have shown a 3-fold increase in middle-aged men and a 5-fold increase in older men over a similar period.
Worldwide: Individuals with cutaneous melanoma have higher survival rates in developed countries (91% in US SEER registries and 81% in Europe) than in developing countries (approximately 40%). Increased educational efforts in developed areas result in earlier diagnosis, treatment, and potential cure of thinner lesions. Worldwide, 160,000 new cases of melanoma were estimated to occur in 2002, with 41,000 deaths reported.[12]
Race
Melanoma is primarily a malignancy of white individuals. African American persons develop melanoma approximately one twentieth as frequently as white persons, and the prevalence in Hispanic persons is approximately one sixth of that in white persons. However, mortality rates are higher in African Americans and Hispanics, who are more likely to have acral melanoma and advanced disease at presentation.
Sex
In the United States, invasive melanoma has a higher female predilection from birth to age 39 years (1 in 370 women compared with 1 in 645 men). However, from age 40 years and older, melanoma in men predominates, occurring in 1 in 39 men compared with 1 in 58 women over a lifetime.[14] Worldwide, of the 160,000 new cases estimated to have occurred in 2002, women were affected slightly more than men (male-to-female ratio, 0.97:1). Conversely, of the estimated 41,000 worldwide deaths in 2002, more occurred in men than in women (male-to-female ratio 1.2:1).
Age
The median age at melanoma diagnosis is 59 years; however, it is the most common cancer in women aged 25-29 years and is second only to breast cancer in women aged 30-34 years. The most striking differences in melanoma incidence and mortality occur in individuals older than 65 years, although modest differences in age-specific incidence and mortality are notable in persons older than 50 years.[13]
Older individuals are both more likely to acquire and to die from melanoma; thus, elderly persons should be a primary target for secondary melanoma prevention, including early detection and screening.[15] Treatment options in elderly persons may also be limited because of comorbid medical conditions, an inability to tolerate adverse medication effects or toxicity, the increased likelihood of drug interactions, and potential exclusion from clinical trials based on age criteria.[15]
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| Stage | TNM Classification | Histologic/Clinical Features | 5-Year Survival Rate, % |
| 0 | Tis N0 M0 | Intraepithelial/in situ melanoma | 100 |
| IA | T1a N0 M0 | ≤1 mm without ulceration and mitotic rate < 1/mm2 | 97 |
| IB | T1b N0 M0 T2a N0 M0 | ≤1 mm with ulceration or mitotic rate ≥1/mm2 1.01-2 mm without ulceration | 91-94 |
| IIA | T2b N0 M0 T3a N0 M0 | 1.01-2 mm with ulceration 2.01-4 mm without ulceration | 79-82 |
| IIB | T3b N0 M0 T4a N0 M0 | 2.01-4 mm with ulceration 4 mm without ulceration | 68-71 |
| IIC | T4b N0 M0 | >4 mm with ulceration | 53 |
| IIIA | T1-4a N1a M0 T1-4a N2a M0 | Single regional nodal micrometastasis, nonulcerated primary 2-3 microscopic positive regional nodes, nonulcerated primary | 78 |
| IIIB | T1-4b N1a M0 T1-4b N2a M0 T1-4a N1b M0 T1-4a N2b M0 T1-4a/b N2c M0 | Single regional nodal micrometastasis, ulcerated primary 2-3 microscopic regional nodes, nonulcerated primary Single regional nodal macrometastasis, nonulcerated primary 2-3 macroscopic regional nodes, no ulceration of primary In-transit met(s)* and/or satellite lesion(s) without metastatic lymph nodes | 54-59 |
| IIIC | T1-4b N2a M0 T1-4b N2b M0 Any T N3 M0 | Single macroscopic regional node, ulcerated primary 2-3 macroscopic metastatic regional nodes, ulcerated primary 4 or more metastatic nodes, matted nodes/gross extracapsular extension, or in-transit met(s)/satellite lesion(s) and metastatic nodes | 40 |
| IV | Any T any N M1a Any T any N M1b Any T any N M1c | Distant skin, subcutaneous, or nodal mets with normal LDH levels Lung mets with normal LDH All other visceral mets with normal LDH or any distant mets with elevated LDH | < 20 |
| *Met is metastasis. | |||

