Which classification accounts for most cancers?

Which classification accounts for most cancers?

• A. Sporadic
• B. Hereditary
• C. Familial
• D. Viral-induced

Answer: (A)

Most cancers arise as sporadic events, meaning they come from mutations acquired during a person’s lifetime in somatic cells rather than from inherited changes. These mutations accumulate with age and are driven by environmental exposures (like smoking or ultraviolet light) and random errors in DNA replication. Because there isn’t a germline mutation passed through the family, there isn’t a consistent pattern in relatives. In contrast, hereditary cancers result from inherited germline mutations and familial cancers show a family clustering pattern, but both are relatively uncommon compared with sporadic cases. Viral-induced cancers exist but account for only a subset. So, sporadic is the best fit for accounting for most cancers.

Most cancers arise as sporadic events, meaning they come from mutations acquired during a person’s lifetime in somatic cells rather than from inherited changes. These mutations accumulate with age and are driven by environmental exposures (like smoking or ultraviolet light) and random errors in DNA replication. Because there isn’t a germline mutation passed through the family, there isn’t a consistent pattern in relatives. In contrast, hereditary cancers result from inherited germline mutations and familial cancers show a family clustering pattern, but both are relatively uncommon compared with sporadic cases. Viral-induced cancers exist but account for only a subset. So, sporadic is the best fit for accounting for most cancers.