Although cancer is considered a common human genetic disease,there has been no significant evidence showing that it is caused by DNA mutations.DNA mutations as drivers or passengers associated with cancer development have been described in many reports.In addition,it has been shown that environmental factors can induce cancer,and thus,cancer can be considered an environmental disease.Liver cancer has become prevalent in Bangladesh,most l ikely due to environmental pollution as the groundwater is naturally contaminated with toxic levels of arsenic.The harm caused by contamination has not been l imited to l iver cancer,as other cancer types have been reported.Moreover,in worst-case scenarios,intake of arsenic has even caused death.As arsenic is usually found in groundwater worldwide,anyone can be affected.However,intake of only a tiny amount is not considered poisonous.Bangladesh has been greatly suffering from arsenic contamination,and as a result,toxicity and cancer have become prevalent.