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Discontinuation of tyrosine kinase inhibitors in chronic myeloid leukemia: when is this a safe option to consider?

Mrs G is a 54-year-old woman with a diagnosis of chronic-phase chronic myeloid leukemia dating back 8 years. She had a low-risk Sokal score at diagnosis and was started on imatinib mesylate at 400 mg orally daily within one month of her diagnosis. Her 3-month evaluation revealed a molecular response measured by quantitative RT-PCR of 1.2% by the International Scale. Within 6 months of therapy, she achieved a complete cytogenetic response, and by 18 months, her BCR-ABL1 transcript levels were undetectable using a quantitative RT-PCR assay with a sensitivity of ≥ 4.5 logs. She has maintained this deep level of response for the past 6.5 years. Despite her excellent response to therapy, she continues to complain of fatigue, intermittent nausea, and weight gain. She is asking to discontinue imatinib mesylate and is not interested in second-line therapy. Is this a safe and reasonable option for this patient?