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  • Local recurrence  (1)
  • Synthetic resins  (1)
  • Transformer assembly  (1)
  • 1
    ISSN: 1534-4681
    Keywords: Melanoma ; Local recurrence ; Resection margins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: In the past, radical margins of excision were prescribed for cutaneous melanoma based on preconceived notions rather than on hard clinical evidence. Methods: In a prospective study of 742 patients with intermediate-thickness melanoma (1–4 mm), 470 patients with trunk or proximal extremity lesions were randomized into a 2-or 4-cm margin. Patients with distal extremity or head and neck lesions (n=272) received uniformly a 2-cm margin. Results: The overall rate of local recurrence was 3.8%. This rate in the randomized portion (n=470) was 2.1% for the 2-cm margin and 2.6% for the 4-cm margin (p=0.72). A progressive increase in local recurrence rates was observed with thickness: 2.3% for lesions 1.0–2.0 mm, 4.2% for those 2.01–3.0 mm, and 11.7% for those 3.01–4.0 mm thick (p=0.001). Local recurrence occurred in 1.5% of those without ulceration and in 10.6% of those with ulceration of the primary lesion (p=0.001). The local recurrence rate was not significantly affected by the margin of resection even among the thicker or ulcerated lesions. It also was not affected significantly by the method of closure of the primary site or management of the regional nodes, or the age or gender of the patients. Conclusions: A 2-cm margin is as effective as a 4-cm margin in local control and survival of intermediate-thickness melanomas. The local recurrence rate is significantly affected by the thickness of the primary lesion and the presence or not of ulceration.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    International archives of occupational and environmental health 66 (1994), S. 49-54 
    ISSN: 1432-1246
    Keywords: Asbestos ; Cancer mortality ; Polychlorinated biphenyls ; Solvents ; Transformer assembly ; Synthetic resins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To address earlier reports of excess cancer mortality associated with employment at a large transformer manufacturing plant, each plant operation was rated for seven exposures: Pyranol (a mixture of poly chlorinated biphenyls and trichlorobenzene), trichloroethylene, benzene, mixed solvents, asbestos, synthetic resins, and machining fluids. Site-specific cancer deaths among active or retired employees were cases; controls were selected from deaths (primarily cardiovascular deaths) presumed to be unassociated with any of the study exposures. Using job records, we then computed person-years of exposure for each subject. All subjects were white males. The only unequivocal association was that of resin systems with lung cancer (odds ratio = 2.2 at 16.6 years of exposure, P = 0.001, in a multiple logistic regression including asbestos, age, year of death, and year of hire). Certain other odds ratios appeared larger, but no other association was so robust and remained as distinct after considering the multiplicity of comparisons. Study power was very limited for most associations, and several biases may have affected our results. Nevertheless, further investigation of synthetic resin systems of the type used in the study plant appears warranted.
    Type of Medium: Electronic Resource
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