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A Population Based Case Control

A Population Based Case Control

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A Population-Based Case-Control Study of Marijuana Use and Head and
Neck Squamous Cell Carcinoma

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Beskrivelse

Cannabinoids, constituents of marijuana smoke, have been recognized to have potential
antitumor properties. However, the epidemiologic evidence addressing the relationship between marijuana use and the induction of head and neck squamous cell carcinoma (HNSCC)
is inconsistent and conflicting.
Cases (n = 434) were patients with incident HNSCC disease from nine medical facilities
in the Greater Boston, MA area between December 1999 and December 2003. Controls
(n = 547) were frequency matched to cases on age (±3 years), gender, and town of residence, randomly selected from Massachusetts town books. A questionnaire was adopted
to collect information on lifetime marijuana use (decade-specific exposures) and associations
evaluated using unconditional logistic regression.
After adjusting for potential confounders (including smoking and alcohol drinking), 10 to
20 years of marijuana use was associated with a significantly reduced risk of HNSCC [odds
ratio (OR)10-<20 years versus never users, 0.38; 95% confidence interval (CI), 0.22-0.67]. Among
marijuana users moderate weekly use was associated with reduced risk (OR0.5-<1.5 times
versus <0.5 time, 0.52; 95% CI, 0.32-0.85). The magnitude of reduced risk was more pronounced for those who started use at an older age (OR15-<20 years versus never users, 0.53;
95% CI, 0.30-0.95; OR≥20 years versus never users, 0.39; 95% CI, 0.17-0.90; Ptrend < 0.001).
These inverse associations did not depend on human papillomavirus 16 antibody status.
However, for the subjects who have the same level of smoking or alcohol drinking, we observed attenuated risk of HNSCC among those who use marijuana compared with those
who do not.
Our study suggests that moderate marijuana use is associated with reduced risk of
HNSCC

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