Which chemo agent is associated with a maximum cumulative lifetime dose?

• A. Cyclophosphamide
• B. Etoposide
• C. Daunorubicin
• D. Nitrogen mustard

Answer: (C)

Cumulative lifetime dose is used for drugs whose toxic effects accumulate with total exposure. Daunorubicin is an anthracycline, and these agents have a well-known, dose-dependent risk of cardiotoxicity that can lead to heart failure years after treatment. Because of this, clinicians impose a maximum lifetime dose to limit cardiac damage, typically expressed as milligrams per square meter and guided by patient factors. Once that limit is reached, treatment plans shift to alternative drugs or regimens to avoid further cardiac risk. Other drugs on the list have serious toxicities, but the concept of a strict, defined lifetime dose cap is most closely tied to daunorubicin due to its cardiotoxic potential.