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  • Title: Pregnancy history and incidence of melanoma in women: a pooled analysis.
    Author: Karagas MR, Zens MS, Stukel TA, Swerdlow AJ, Rosso S, Osterlind A, Mack T, Kirkpatrick C, Holly EA, Green A, Gallagher R, Elwood JM, Armstrong BK.
    Journal: Cancer Causes Control; 2006 Feb; 17(1):11-9. PubMed ID: 16411048.
    Abstract:
    There is evidence that pregnancy history including age at first birth and parity may play a role in risk of cutaneous melanoma in women, although, epidemiological findings are inconsistent. We conducted a collaborative analysis of these factors using the original data from ten completed case-control studies (2391 cases and 3199 controls), and assessed the potential confounding effects of socioeconomic, pigmentary, and sun exposure-related factors. We found no overall association with ever having a live birth (pooled odds ratio (pOR) 0.95, 95% confidence interval (CI) 0.67-1.35). However, we detected a reduced risk of melanoma among women with higher parity (> or = 5 versus no live births pOR 0.76, 95% CI 0.49-1.18, each live birth pOR 0.95, 95% CI 0.91-0.99, p trend = 0.05). Women with both earlier age at first birth (e.g., <20 years) and higher parity (e.g., > or = 5 live births) had a particularly lower risk than women with later age at first birth (e.g., > or = 25 years) and lower parity (e.g., <5 live births) (pOR 0.33, 95% CI 0.14-0.75). The results are compatible with an effect of reproductive history-related factors on melanoma risk, but also could reflect differences in other factors, such as sun exposure history.
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