Which statement is true regarding leukemia latency and radiation exposure?

Which statement is true regarding leukemia latency and radiation exposure?

• A. Leukemia has the shortest latency period among cancers
• B. All cancers have the same latency period
• C. Hair loss is the primary sign of latency
• D. Hypoxic cells increase sensitivity to densely ionizing radiation

Answer: (A)

Latency after radiation exposure is the time from exposure to the appearance of cancer. Leukemia tends to show up sooner than most solid tumors because the blood-forming cells divide rapidly and are highly susceptible to radiation-induced DNA damage. This quick turnover means mutations can lead to leukemia within a few years, making it one of the cancers with the shortest latency after exposure. In contrast, many solid tumors take longer to develop, often a decade or more, so the idea that all cancers share the same latency isn’t accurate. Hair loss isn’t a sign of latency; it’s an acute side effect of radiation exposure. It doesn’t indicate how long it takes for cancer to develop. As for the statement about hypoxic cells and densely ionizing radiation, hypoxia generally makes cells more resistant to conventional low-LET radiation, and while densely ionizing (high-LET) radiation is less affected by oxygen levels, saying it increases sensitivity isn’t correct.

Latency after radiation exposure is the time from exposure to the appearance of cancer. Leukemia tends to show up sooner than most solid tumors because the blood-forming cells divide rapidly and are highly susceptible to radiation-induced DNA damage. This quick turnover means mutations can lead to leukemia within a few years, making it one of the cancers with the shortest latency after exposure. In contrast, many solid tumors take longer to develop, often a decade or more, so the idea that all cancers share the same latency isn’t accurate.

Hair loss isn’t a sign of latency; it’s an acute side effect of radiation exposure. It doesn’t indicate how long it takes for cancer to develop. As for the statement about hypoxic cells and densely ionizing radiation, hypoxia generally makes cells more resistant to conventional low-LET radiation, and while densely ionizing (high-LET) radiation is less affected by oxygen levels, saying it increases sensitivity isn’t correct.