Endocrine Therapy in Patients with Low to Intermediate Oncotype Score

Studies have shown aromatase inhibitors to be superior to tamoxifen in breast cancer recurrence and mortality in postmenopausal women

The TailoRx trial showed no difference in disease-free survival (DFS) or overall survival (OS) in women with a low or intermediate oncotype score when comparing chemotherapy plus endocrine therapy to endocrine therapy alone

Both tamoxifen and aromatase inhibitors have been shown to significantly improve breast cancer recurrence and survival rates in women with HR+ breast cancer.

References

Albain KS, Barlow WE, Shak S, et al. Prognostic and predictive value of the 21-gene recurrence score assay in postmenopausal women with node-positive, oestrogen-receptor-positive breast cancer on chemotherapy: a retrospective analysis of a randomised trial. Lancet Oncol. 2010; 11(1): 55-65.

Gnant M, Filipits M, Greil R, et al. Predicting distant recurrence in receptor-positive breast cancer patients with limited clinicopathological risk: using the PAM50 Risk of Recurrence score in 1478 postmenopausal patients of the ABCSG-8 trial treated with adjuvant endocrine therapy alone. Ann Oncol. 2014; 25(2): 339-45.

Early Breast Cancer Trialists’ Collaborative Group, Davies C, Godwin J, et al. Relevance of breast cancer hormone receptors and other factors to the efficacy of adjuvant tamoxifen: patient-level meta-analysis of randomised trials. Lancet. 2011; 378(9793): 771-84.
Francis PA, Pagani O, Fleming GF, et al. Tailoring Adjuvant Endocrine Therapy for Premenopausal Breast Cancer. N Engl J Med. 2018; 379(2): 122-137. doi: 10.1056/NEJMoa1803164.

Early Breast Cancer Trialists’ Collaborative Group. Aromatase inhibitors versus tamoxifen in early breast cancer: patient-level meta-analysis of the randomised trials. Lancet. 2015; 386(10001): 1341-52.

Vogel VG, Costantino JP, Wickerham DL, et al. Update of the National Surgical Adjuvant Breast and Bowel Project Study of Tamoxifen and Raloxifene (STAR) P-2 Trial: Preventing breast cancer. Cancer Prev Res (Phila). 2010; 3(6): 696-706.

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