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Comparative benefit from small tumour size and adjuvant chemotherapy: clues for explaining breast cancer mortality decline.

Abstract：

BACKGROUND:Breast cancer mortality steadily declined from the 1990s and this has been attributed to early detection and/or to improvements in therapy. Which of those two has had the greater impact is a subject of contention. METHODS:A database of 386 patients, enrolled in a randomized clinical trial on the effect of adjuvant chemotherapy (CMF), was analysed. The probabilities of recurrence and death were estimated by the Fine and Gray's model and by the Cox model. Time dependent covariate and interaction effects were investigated by additive models. Absolute risk reductions (ARR) related to adjuvant treatment or to tumour size [diameter ≤ 2 cm (T1) or >2 cm (T2/T3)] were estimated. RESULTS:CMF-related reduction in recurrence emerges early, reaches a maximum level at 3 years and persists at a constant level thereafter. Tumour-size-related recurrence reduction, after a maximum at 3 years, displays a progressive regular reduction approaching zero. Patients with any tumour size, when given CMF, exhibit mortality reduction that displays an early regular increase and continues to a persistent plateau. In contrast, tumour-size-related mortality reduction reaches a maximum at 5-7 years and then regularly drops to very low values for patients of both trial arms. CONCLUSIONS:Findings reveal that there is a different time-dependent benefit from chemotherapy and from smaller tumour size at diagnosis. The benefit from adjuvant chemotherapy is long-lasting for patients with any tumour size while the early benefit of diagnosing smaller tumours substantially decreases afterwards. Treatment improvements have probably had greater impact on the mortality reduction than mammography screening.

journal_name

BMC Cancer

journal_title

BMC cancer

authors

Demicheli R,Ambrogi F

doi

10.1186/1471-2407-14-702

subject

Has Abstract

pub_date

2014-09-24 00:00:00

pages

702

issn

1471-2407

pii

1471-2407-14-702

journal_volume

14

pub_type

杂志文章

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