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• W2137942385 abstract "“Deep time”—a phrase popularized by science writers such as John McPhee and Stephen J. Gould—refers to the intellectual challenge of grappling with the vast geologic and cosmologic time scale, a problem that has constrained geologists for centuries, because it is so hard to conceptualize events transpiring over billions of years. Oncologists, a group usually confronted by the pressing demands of the here and now, have a variation on the deep time problem when they contemplate management of hormone receptor–positive, early-stage breast cancer, a disease with a long natural history and subtle, fascinating intrinsic variations. Adjuvant endocrine therapies often span years, creating a long-trajectory of treatment, adverse event management, and surveillance and thus differ in deep time from some other oncology outcomes measured in short-term response rates or progression intervals of months. Recent reports have yielded important insights into the deep time issues of adjuvant endocrine therapy. The Early Breast Cancer Trialists’ Collaborative Group reiterated the long-term value of 5 years of tamoxifen, which lowers breast cancer recurrence and death through 15 years of follow-up. The Early Breast Cancer Trialists’ Collaborative Group shows a clear time-dependence effect for tamoxifen; the annualized risk of recurrence is greatest in years 0 through 4 (3%– 4% risk per year), but so are benefits of tamoxifen (relative risk reductions, 42%–53%). Yet late recurrence remains an important issue in adjuvant therapy. In years 5 through 9, there is a persistent 2% to 3% annual recurrence risk, which has been lowered by tamoxifen (relative risk reduction, 32%). After 10 years, the annual risk of recurrence is approximately 2%, and there is no lingering risk reduction on a year-to-year basis for having received tamoxifen for the initial 5 years. Long-term results are now available from several of the canonical adjuvant trials of aromatase inhibitors, including the Intergroup Exemestane Study (IES) reported by Bliss et al, which randomly assigned patients to either ongoing tamoxifen or a switch to exemestane after 2 years of tamoxifen. As with the tamoxifen overview experience, the long-term follow-up in the IES trial shows a residual annual event rate of 3% to 4% that extends outward for at least another 5 years after the end of 5 years of adjuvant endocrine therapy, regardless of whether the patient received tamoxifen or tamoxifen followed by an aromatase inhibitor (AI). Recurrences after the conclusion of drug treatment far outnumber those that arise during treatment. Similar findings with regard to late recurrence risk have been reported from the ATAC and BIG 1-98 trials, which compared tamoxifen versus an AI for a total of 5 years of therapy. In both the Arimidex, Tamoxifen, Alone or in Combination (ATAC) trial and Breast International Group trial 1-98 (BIG 1-98), the annual recurrence risk in years 6 through 10 was approximately 2% per year, and half of all recurrences arose in these later years of follow-up. Collectively, these findings underscore the persistent risk of late recurrence in estrogen receptor (ER) –positive breast cancer and the relative inability of 5 years of endocrine therapy to mitigate that risk. This pattern of persistent risk stands in marked contrast to ER-negative breast cancers, in which the recurrence risk tails off dramatically beyond the 5-year benchmark. Predictors of early recurrence of ER-positive breast cancer among women receiving endocrine therapy include larger tumor stage and positive nodal status, lower levels of hormone-receptor expression, higher grade and proliferative markers, human epidermal growth factor receptor 2 overexpression, and high recurrence scores on multigene arrays. Not coincidentally, these are clinical factors that are likely to confer benefit from adjuvant chemotherapy. By contrast, predictors of late recurrence are not well characterized, although nodal involvement and lobular histology are associated with greater risk of relapse after 5 years of endocrine therapy It is tautological to state that women at jeopardy for late recurrence are those who do not experience early recurrence. Thus, it is likely that biologic predictors of late recurrence would be the converse of markers of early recurrence, but to date, there has been little exploration of biomarkers or gene profiles associated with later events. Ideally, clinicians would like to identify which tumors pose persistent peril such that they warrant ongoing, longer durations of adjuvant endocrine therapy and, by contrast, which tumors might adequately be treated with shorter durations so patients need only 5 years of therapy. At present, there are no clinical markers sufficiently reliable to determine whether duration should vary from patient to patient. Undoubtedly, the answer will lie in a combination of risk defined both by baseline stage and by pathobiologic features associated with treatment benefit and inherent propensity to recur. A criticism of the switching studies of AIs, in which women received tamoxifen first and were then randomly assigned to treatment with or without AIs is that they are biased against patients who experience early relapse before the switch. However, this critique does not apply to the Austrian Breast and Colorectal Cancer Study Group JOURNAL OF CLINICAL ONCOLOGY E D I T O R I A L S" @default.
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• W2137942385 date "2012-03-01" @default.
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• W2137942385 title "Deep Time: The Long and the Short of Adjuvant Endocrine Therapy for Breast Cancer" @default.
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• W2137942385 doi "https://doi.org/10.1200/jco.2011.40.1455" @default.
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