In remission, consider drug omission
How should patients be monitored if they are doing well?
“In general, I tend to follow patients monthly for the first six months after starting therapy, to make sure they are tolerating it well and to help manage side effects,” Dr. Lai said. “After that, I follow once every three months, and then often space out visits depending on whether they hit their molecular milestones and how long they’re in remission.”
In certain cases, patients may be taken off medication. The most recent National Comprehensive Cancer Network guidelines for treatment of CML, published in 2021, say that “discontinuation of TKI therapy (with close monitoring) is feasible in carefully selected, consenting patients” with early stage CML who’ve reached remission, defined as deep molecular response (DMR) of at least MR 4.0 for at least 2 years.
The guidelines caution that disease recurrence appears in “approximately 40%-60% of patients who discontinue TKI therapy after achieving DMR experience recurrence within 12 months of treatment cessation, in some cases as early as one month after discontinuation of TKI therapy.”
Still, the guidelines add that “resumption of TKI therapy immediately after recurrence results in the achievement of DMR in almost all patients.”
Dr. Atallah said stopping medication can be especially helpful for patients who grapple with side effects such as fatigue, diarrhea, and muscle aches. Some patients who take the drugs fear losing their health insurance and facing sky-high drug expenses. In 2018, average daily TKI costs for patients with CML were over $350, a 2020 report found.
Many patients were prescribed hugely expensive second-line treatments rather than inexpensive generic imatinib, the report said, despite “no evidence that later-generation TKIs provide superior progression free or overall survival.”
Many patients, however, refuse to consider stopping their medication, Dr. Atallah said. More data about treatment-free remission is needed, and the 21 U.S. academic medical centers in the H. Jean Khoury Cure CML Consortium are gathering information about patient outcomes.
Mr. Fahnestock is a fan of treatment-free remission. He stopped taking Gleevec about 2 years ago on the advice of his physician after he reached undetectable levels of disease.
“It was sort of a nonevent, really, with no discernible physical effects beyond exacerbation of the osteoarthritis in my hands,” he said. According to him, it’s not clear if this effect is linked to his eliminating the medication.
“I also vaguely hoped I’d feel better, even though I’d never been able to nail down any deleterious side effects,” he said. “No such luck, as it happens.”
Blood work has indicated no resurgence of the disease, and Mr. Fahnestock continues to volunteer as a rural firefighter.
“In general, I’m apparently reasonably healthy for my age, despite my folly [in younger years], and firefighting requires me to stay in reasonable shape,” he said. “I’ve recently been made aware of minor kidney issues and prediabetes. But, hell, I’m genetically scheduled to croak within 5 years or so, so why worry?”
National survival statistics in CML vary by factors such as gender and age, as a 2021 study revealed, and men have worse outcomes. Still, there’s a good chance Mr. Fahnestock won’t need to worry about CML ever again.
Dr. Atallah disclosed research support from Novartis and Takeda and has served both of those firms and Bristol-Myers Squibb as a consultant advisor. Dr. Lai discloses tied with Bristol-Myers Squibb, Jazz, Genentech, Novartis, Abbvie, Daiichi Sankyo, Astellas, MacroGenics, Servier, and Taiho. Mr. Fahnestock has no disclosures.