Mohs micrographic surgery and surgical excision for nonmelanoma skin cancer treatment in the Medicare population.

OBJECTIVES: To identify Medicare use rates of Mohs micrographic surgery (MMS) and surgical excision for the treatment of nonmelanoma skin cancer (NMSC) and to identify patient, lesion, and geographic characteristics associated with treatment type. DESIGN: A retrospective analysis of Medicare beneficiaries. SETTING: Surveillance, Epidemiology, and End Results database. PATIENTS: Patients undergoing MMS or other surgical intervention for the treatment of NMSC from January 1, 2001, through December 31, 2006. MAIN OUTCOME MEASURES: Surgical treatment, patient, and lesion characteristics. RESULTS: A total of 26,931 operations were performed for the treatment of NMSC from 2001 through 2006, of which 36.4% were MMS. Although the rate of surgical excision slightly increased during this period (1.8 vs 2.1 per 100 Medicare beneficiaries), the rate of MMS doubled (0.75 vs 1.5 per 100 Medicare beneficiaries). In 46.9% of facial lesions, MMS was performed, whereas MMS was used to treat 14.7% of total body lesions. Atlanta, Georgia, had the highest proportion of patients treated with MMS (45.1%); Louisiana had the lowest (11.0%). Age, race, lesion location, and area of country for patient treatment were significantly associated with MMS use (all P < .001). CONCLUSIONS: Surgical treatment of NMSC increased substantially from 2001 through 2006, primarily because of a doubling in the rate of MMS procedures. Significant differences in surgical rates, depending on patient age, race, lesion location, and geographic region, of treatment were found.

Nondermatologists' use of predictive terms for a potentially malignant lesion.

BACKGROUND: Skin cancer is frequently suspected by nondermatologists. Many dermatology practices currently do not triage referrals from nondermatologists. Little is known how nondermatologists describe lesions of concern when making referrals. OBJECTIVE: We sought to assess the descriptive terminology used by nondermatologists when referring patients with potential cutaneous malignancies. METHODS: We completed a retrospective chart review of 400 patients referred by nondermatologists for skin lesions suspicious of malignancy. We collected the reason for the consult, all terminology used to characterize the lesion, and the final diagnosis. RESULTS: Clinicians documented 680 reasons for referring patients with suspicious lesions. General concern (rule out malignancy) without specific descriptors was used in 78 referrals, of which 23% (n = 18) were found to be associated with malignancy. Specific descriptive terminologies used most frequently by nondermatologists to describe suspicious lesions were: hyperpigmented (n = 71), changing size (n = 69), nonhealing (n = 55), irregular border (n = 52), irritated and/or scaly (n = 40), and raised (n = 33). A statistically significant correlation (P < 0.05) was found between skin cancer and the following terms: nonhealing, ulcerated, and rule out basal cell carcinoma. CONCLUSION: The descriptive terminology of potential cutaneous malignancies utilized by nondermatologists may provide important clues to aid dermatologists in triage decisions. Specifically, ulcerated, nonhealing, and rule out basal cell carcinoma may be terms that indicate the patient should be seen by the dermatologist in a timely manner.

Outcomes of referral to dermatology for suspicious lesions: implications for teledermatology.

OBJECTIVES: To determine the proportion of suspicious lesions referred by nondermatologists that are found to be malignant and the number of incidental skin cancers identified at the time of dermatology referral. DESIGN: Retrospective cohort study. SETTING: Veterans Affairs Connecticut Healthcare System. PATIENTS: Four hundred patients referred by nondermatologists for skin lesions suspected of being malignant between January 1, 2006, through December 31, 2009. MAIN OUTCOME MEASURES: Data collected included the type of referring provider, the final diagnosis by the dermatologist, and the number and type of incidental lesions. RESULTS: Only 22.0% of the index lesions (ie, the lesions that prompted the referral) were found to be cancerous. In aggregate, 149 cancerous lesions were noted in 98 patients. However, only 88 (59.1%) were identified in the index lesion; 111 incidental lesions were biopsied by the consulting dermatologist, with 61 (55.0%) additional skin cancers identified. Twelve of the 61 incidental cancers (19.7%) were found in patients whose index lesion was clinically benign and was not biopsied. CONCLUSIONS: Nondermatologists may benefit from focused educational initiatives on skin cancer detection, particularly the significance of the total body skin examination and the expectations for and limitations of teledermatology. A substantial proportion of malignant lesions was incidentally identified by the consulting dermatologist in addition to the primary lesion of concern. The use of teledermatology to assess a specific lesion of concern may be associated with underdiagnosis of clinically significant lesions that are not appreciated by the referring physician. Therefore, teledermatology must not be used as a substitute for a total body skin examination.

Alu repeats increase local recombination rates.

BACKGROUND: Recombination rates vary widely across the human genome, but little of that variation is correlated with known DNA sequence features. The genome contains more than one million Alu mobile element insertions, and these insertions have been implicated in non-homologous recombination, modulation of DNA methylation, and transcriptional regulation. If individual Alu insertions have even modest effects on local recombination rates, they could collectively have a significant impact on the pattern of linkage disequilibrium in the human genome and on the evolution of the Alu family itself. RESULTS: We carried out sequencing, SNP identification, and SNP genotyping around 19 AluY insertion loci in 347 individuals sampled from diverse populations, then used the SNP genotypes to estimate local recombination rates around the AluY loci. The loci and SNPs were chosen so as to minimize other factors (such as SNP ascertainment bias and SNP density) that could influence recombination rate estimates. We detected a significant increase in recombination rate within approximately 2 kb of the AluY insertions in our African population sample. To test this observation against a larger set of AluY insertions, we applied our locus- and SNP-selection design and analyses to the HapMap Phase II data. In that data set, we observed a significantly increased recombination rate near AluY insertions in both the CEU and YRI populations. CONCLUSION: We show that the presence of a fixed AluY insertion is significantly predictive of an elevated local recombination rate within 2 kb of the insertion, independent of other known predictors. The magnitude of this effect, approximately a 6% increase, is comparable to the effects of some recombinogenic DNA sequence motifs identified via their association with recombination hot spots.