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In page Hairy cell leukemia:

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During the weeks following treatment the patient's immune system is severely weakened, but their bone marrow will begin to produce normal blood cells again. Treatment often results in long-term remission. About 85% of patients achieve a complete response from treatment with either cladribine or pentostatin, and another 10% receive some benefit from these drugs, although there is no permanent cure for this disease. If the cancer cells return, the treatment may be repeated and should again result in remission, although the odds of success decline with repeated treatment.[2] Remission lengths vary significantly, from one year to more than twenty years. The median patient can expect a treatment-free interval of about ten years.