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ORLANDO – The more , according to a review of over 200,000 subjects in decades-long health professional cohorts.
It’s well known that nevi increase the risk of melanoma, and the study confirmed that fact. The basal cell carcinoma finding, however, is novel. “The relationship between nevi and non-melanoma skin cancer has not [previously] been clearly demonstrated in large population cohorts,” said lead investigator Erin X. Wei, MD, a dermatologist at Brigham and Women’s Hospital, Boston.
“Nevus count serves as a convenient maker to identify patients at risk for both melanoma and basal cell carcinoma. Providers should be aware of these increased risks in patients with any nevi on the extremity, particularly 15 or more,” she said at the International Investigative Dermatology meeting.
There was no association, meanwhile, between nevus counts and squamous cell carcinoma (SCC).
The team reviewed 176,317 women in the Nurses’ Health Study 1 and 2, as well as 32,383 men in the Health Professionals Follow-up Study. Subjects were enrolled in the 1980s and followed through 2012. They reported nevus counts on their arms or legs at baseline, and filled out questionnaires on a regular basis that, among many other things, asked about new skin cancer diagnoses.
Overall, there were 30,457 incident basal cell carcinomas (BCCs), 1,704 incident melanomas, and 2,296 incident SCCs. Melanomas and SCCs – as well as a portion of BCCs – were confirmed by histology.
The team correlated the skin cancer incidence with how many moles subjects reported at baseline: zero, 1-5, 6-14, or 15 or more.
“Surprisingly, having any nevi on an extremity was associated with a significant increase in the risk of basal cell carcinoma,” in a dose-dependent manner, with 15 or more conferring a 40% increased risk of BCC, compared to subjects with no extremity nevi, Dr. Wei said (P less than .0001).
Even one mole also increased the risk of melanoma; having six or more nearly tripled it, again in a dose-dependent fashion (P less than .0001). Extremity nevi increased the risk of melanoma across all anatomic sites, including head, neck, and trunk.
The findings were statistically significant, and adjusted for age, body mass index, smoking, sun exposure, sunburn history, and other confounders.
There was no industry funding for the work, and the investigators had no relevant disclosures.
SOURCE: Wei EX et al. 2018 International Investigative Dermatology meeting abstract 233
ORLANDO – The more , according to a review of over 200,000 subjects in decades-long health professional cohorts.
It’s well known that nevi increase the risk of melanoma, and the study confirmed that fact. The basal cell carcinoma finding, however, is novel. “The relationship between nevi and non-melanoma skin cancer has not [previously] been clearly demonstrated in large population cohorts,” said lead investigator Erin X. Wei, MD, a dermatologist at Brigham and Women’s Hospital, Boston.
“Nevus count serves as a convenient maker to identify patients at risk for both melanoma and basal cell carcinoma. Providers should be aware of these increased risks in patients with any nevi on the extremity, particularly 15 or more,” she said at the International Investigative Dermatology meeting.
There was no association, meanwhile, between nevus counts and squamous cell carcinoma (SCC).
The team reviewed 176,317 women in the Nurses’ Health Study 1 and 2, as well as 32,383 men in the Health Professionals Follow-up Study. Subjects were enrolled in the 1980s and followed through 2012. They reported nevus counts on their arms or legs at baseline, and filled out questionnaires on a regular basis that, among many other things, asked about new skin cancer diagnoses.
Overall, there were 30,457 incident basal cell carcinomas (BCCs), 1,704 incident melanomas, and 2,296 incident SCCs. Melanomas and SCCs – as well as a portion of BCCs – were confirmed by histology.
The team correlated the skin cancer incidence with how many moles subjects reported at baseline: zero, 1-5, 6-14, or 15 or more.
“Surprisingly, having any nevi on an extremity was associated with a significant increase in the risk of basal cell carcinoma,” in a dose-dependent manner, with 15 or more conferring a 40% increased risk of BCC, compared to subjects with no extremity nevi, Dr. Wei said (P less than .0001).
Even one mole also increased the risk of melanoma; having six or more nearly tripled it, again in a dose-dependent fashion (P less than .0001). Extremity nevi increased the risk of melanoma across all anatomic sites, including head, neck, and trunk.
The findings were statistically significant, and adjusted for age, body mass index, smoking, sun exposure, sunburn history, and other confounders.
There was no industry funding for the work, and the investigators had no relevant disclosures.
SOURCE: Wei EX et al. 2018 International Investigative Dermatology meeting abstract 233
ORLANDO – The more , according to a review of over 200,000 subjects in decades-long health professional cohorts.
It’s well known that nevi increase the risk of melanoma, and the study confirmed that fact. The basal cell carcinoma finding, however, is novel. “The relationship between nevi and non-melanoma skin cancer has not [previously] been clearly demonstrated in large population cohorts,” said lead investigator Erin X. Wei, MD, a dermatologist at Brigham and Women’s Hospital, Boston.
“Nevus count serves as a convenient maker to identify patients at risk for both melanoma and basal cell carcinoma. Providers should be aware of these increased risks in patients with any nevi on the extremity, particularly 15 or more,” she said at the International Investigative Dermatology meeting.
There was no association, meanwhile, between nevus counts and squamous cell carcinoma (SCC).
The team reviewed 176,317 women in the Nurses’ Health Study 1 and 2, as well as 32,383 men in the Health Professionals Follow-up Study. Subjects were enrolled in the 1980s and followed through 2012. They reported nevus counts on their arms or legs at baseline, and filled out questionnaires on a regular basis that, among many other things, asked about new skin cancer diagnoses.
Overall, there were 30,457 incident basal cell carcinomas (BCCs), 1,704 incident melanomas, and 2,296 incident SCCs. Melanomas and SCCs – as well as a portion of BCCs – were confirmed by histology.
The team correlated the skin cancer incidence with how many moles subjects reported at baseline: zero, 1-5, 6-14, or 15 or more.
“Surprisingly, having any nevi on an extremity was associated with a significant increase in the risk of basal cell carcinoma,” in a dose-dependent manner, with 15 or more conferring a 40% increased risk of BCC, compared to subjects with no extremity nevi, Dr. Wei said (P less than .0001).
Even one mole also increased the risk of melanoma; having six or more nearly tripled it, again in a dose-dependent fashion (P less than .0001). Extremity nevi increased the risk of melanoma across all anatomic sites, including head, neck, and trunk.
The findings were statistically significant, and adjusted for age, body mass index, smoking, sun exposure, sunburn history, and other confounders.
There was no industry funding for the work, and the investigators had no relevant disclosures.
SOURCE: Wei EX et al. 2018 International Investigative Dermatology meeting abstract 233
REPORTING FROM IID 2018
Key clinical point: The more nevi a person has, the greater the risk of basal cell carcinoma.
Major finding: Having 15 or more moles on the arms and legs increased the risk 40% (P less than .0001).
Study details: Review of over 200,000 subjects in decades-long health professional cohorts
Disclosures: There was no industry funding for the work, and the investigators had no relevant disclosures.
Source: Wei EX et al. 2018 International Investigative Dermatology meeting abstract 233