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  • Title: Salivary gland cancer in the United States.
    Author: Sun EC, Curtis R, Melbye M, Goedert JJ.
    Journal: Cancer Epidemiol Biomarkers Prev; 1999 Dec; 8(12):1095-100. PubMed ID: 10613342.
    Abstract:
    The risk of salivary gland cancer (SGC) is increased in atomic bomb survivors and after radiotherapy, but other risk factors are not well established. Some studies have suggested an association of SGC with breast cancer and with exposure to various viruses or UVB radiation. Corroborating evidence of these associations was sought by using population-based registries to examine the demographic distribution of SGC, patterns of secondary primary cancers after SGC, and risk of SGC with AIDS. SGC incidence per 100,000 persons did not change between 1973 and 1992, averaging 1.2 in males and 0.8 in females, with a steep age gradient. To examine the relationship between UVB exposure and SGC, population-based, age-adjusted incidence rates of SGC were plotted against the UVB insolation of each registry site. Regression analysis suggested no correlation between SGC incidence and increasing UVB insolation (beta = 0.10, R2 = 0.08). SGC also did not appear to be associated with second cancers that have been linked to herpes or papilloma viruses or with AIDS [observed/expected (O/E) ratio, <2.8], but all of these conditions are so uncommon that only very large relative risks would have been statistically significant. Women with SGC before age 35 had a statistically nonsignificant elevation in breast cancer risk [O/E, 3.30; 95% confidence interval (CI), 0.66-9.65], and older women had no increased risk of breast cancer. SGC patients were at increased risk for nonsalivary, second-primary oropharyngeal cancers (O/E, 3.27; 95% CI, 2.00-5.05), thyroid cancer (O/E, 3.31; 95% CI, 1.07-7.73), and lung cancer (O/E, 1.86; 95% CI, 1.45-2.35), particularly in patients whose SGC was treated with radiotherapy (O/E, 2.83; 95% CI, 2.06-3.80). In summary, SGC remains rare and does not appear to be associated with AIDS, virally related malignancies, or UVB. Patients who have had SGC, however, should be monitored for subsequent oropharyngeal, thyroid, and lung cancers.
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