Smoking and alcohol consumption are risk factors for the development of many solid tumors such as lung, larynx, pharynx, oral cavity, colon, esophagus, kidney, pancreas, breast and cervix cancer [24
]. Smoking- and alcohol-related cancers constitute approximately 63% of secondary cancers reported in Behringer et al.'s study, but the prevalence of smoking and alcohol consumption was not reported in that study. To make a firm conclusion, the study population should have been analyzed according to the risk factors in the development of solid tumors.
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Department of Medical Oncology, Ankara University School of Medicine, 06100-TR, Sihhiye, Ankara, Turkey
* Email: gungorutkan_md{at}yahoo.com
References
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