Canadian study: Cannabis use among patients with head and neck cancer not associated with developing second primary cancer

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It appears that unlike tobacco smoking, there is no significant association between cannabis use and developing a second primary cancer, notes a new study of 500-plus patients previously enrolled at a cancer centre in Hamilton, Ont. “The results suggest that cannabis behaves differently than tobacco smoking, as it may not be associated with the traditional concepts of field cancerization,” states the retrospective study, recently published online . Field cancerization involves the formation of patches of pre-malignant disease within the entire surface exposed to carcinogens, it explains. “Although hypothesized, it is not yet known whether cannabis is a direct causative agent for HNC (carcinoma of the head and neck) or increases the risk of SPC (squamous cell carcinoma) through field cancerization,” the study authors write. A third of Canadians with cancer saying yes to cannabis: Alberta study Canadian cancer survivors explain reasons for consuming or abstaining from cannabis in new study If her daughter was sick and weed could help, U.S. congresswoman says she would break the rules, too Conducted by researchers from McMaster University, the University of British Columbia and the University of Toronto, the study considered the outcomes of 513 patients, 59 of them in the cannabis group and 454 in the control group. All of the patients were from the Hamilton Region Head and Neck Cancer Database and were treated at a single cancer centre between 2011 and 2015. There were no significant difference between patients in the cannabis and control group, “except that cannabis users were more likely to develop primary oropharyngeal cancer,” notes the abstract. Two of the 59 patients who used cannabis, 3.4 per cent, developed a second primary cancer compared to 23 of the 454 patients, 5.1 per cent, of the controls. Both of the cannabis users and six of the controls who developed…

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Source : Canadian study: Cannabis use among patients with head and neck cancer not associated with developing second primary cancer

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