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Breast cancer survival and incidence of second primary cancers after 30 years in a randomized study of two versus five years of adjuvant tamoxifen therapy
Southern Alvsborg Hosp, Sweden; Sahlgrens Univ Hosp, Sweden.
Linköping University, Department of Biomedical and Clinical Sciences, Division of Surgery, Orthopedics and Oncology. Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Regionledningskontoret, Regional Cancer Center.
Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Regionledningskontoret, Regional Cancer Center. Linköping University, Department of Biomedical and Clinical Sciences.
Umea Univ Hosp, Sweden.
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2023 (English)In: Breast, ISSN 0960-9776, E-ISSN 1532-3080, Vol. 71, p. 63-68Article in journal (Refereed) Published
Abstract [en]

Background: Tamoxifen is an established treatment for breast cancer, but its long-term effects on survival and on secondary cancers are not fully evaluated. Material and methods: We studied 30 years outcome of 4124 postmenopausal patients who were randomized to receive (totally) two or five years of adjuvant tamoxifen.Results: After 5 years of follow-up, when tamoxifen treatment was finished in both groups, until 15 years of follow-up, overall mortality (HR 0.80, 95% CI 0.72-0.90, p < 0.001), breast cancer mortality for all patients (HR 0.80, 95% CI 0.68-0.94, p = 0.006) and breast cancer mortality for patients with estrogen receptor positive disease (HR 0.67, 95% CI 0.55-0.83, p < 0.001) were significantly reduced in the five-year group as compared to the two-year group. After 15 years, the difference remained but did not further increase. In the five-year group, the incidence of contralateral breast cancer was gradually reduced during the entire period of observation. The incidence of lung cancer was also reduced in the five-year group. In contrast there was an increased endometrial cancer incidence in the five-year group and for those receiving 40 mg of tamoxifen this incidence was further increased.Conclusion: Three more years of tamoxifen therapy reduced the risk of breast cancer mortality. The difference was established during the first 15 years after randomization. Moreover, the incidence of contralateral breast cancer gradually decreased for 30 years. The incidence of lung cancer was reduced in the five-year group. In contrast the incidence of endometrial cancer was increased.

Place, publisher, year, edition, pages
CHURCHILL LIVINGSTONE , 2023. Vol. 71, p. 63-68
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Cancer and Oncology
Identifiers
URN: urn:nbn:se:liu:diva-197854DOI: 10.1016/j.breast.2023.07.010ISI: 001060449900001PubMedID: 37517154OAI: oai:DiVA.org:liu-197854DiVA, id: diva2:1798151
Note

Funding Agencies|King Gustaf the Vth Jubilee Clinic Cancer Foundations in Gothenburg; Swedish governmental grants to scientists working in health care (ALF); Swedish Cancer Society; Alice Swenzon Foundation; Walter Anderssons Foundation; Onkologiska Klinikerna i Linkoping Forskningsfond Ulla and Tibor Veres award; Swedish Breast Cancer Association

Available from: 2023-09-18 Created: 2023-09-18 Last updated: 2024-02-12

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Fohlin, HelenaRosell, JohanStål, OlleNordenskjöld, Bo
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