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- Nordenskjöld, Anna, 1969, et al.
(författare)
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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
- 2023
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Ingår i: Breast. - : CHURCHILL LIVINGSTONE. - 0960-9776 .- 1532-3080. ; 71, s. 63-68
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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| 2. |
- Rosell, Johan, et al.
(författare)
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Effects of adjuvant tamoxifen therapy on cardiac disease: results from a randomized trial with long-term follow-up
- 2013
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Ingår i: Breast Cancer Research and Treatment. - New York : SPRINGER, 233 SPRING ST, NEW YORK, NY 10013 USA. - 0167-6806 .- 1573-7217. ; 138:2, s. 467-473
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Tidskriftsartikel (refereegranskat)abstract
- Tamoxifen is associated with a reduced risk of coronary heart disease (CHD). However, there are few reports on long-term effects. Using data from a large Swedish randomized trial of 5 and 2 years of adjuvant tamoxifen in women with early breast cancer, we here present results on morbidity and mortality from cardiac diseases during treatment and long-term after treatment. A total of 4,150 patients were breast cancer recurrence-free after 2 years. Data from the Swedish National Hospital Discharge Registry combined with information from the Swedish Cause of Death Registry were used to define events of disease. Hazard ratios were estimated using Cox regression. Patients assigned to 5 years in comparison with 2 years of postoperative tamoxifen experienced a reduced incidence of CHD [hazard ratio (HR), 0.83; 95 % CI 0.70-1.00], especially apparent during the active treatment period (HR 0.65; 95 % CI 0.43-1.00). The mortality from CHD was significantly reduced (HR 0.72; 95 % CI 0.53-0.97). During the active treatment, the morbidity of other heart diseases was also significantly reduced (HR 0.40; 95 % CI 0.25-0.64) but not after treatment stopped (HR 1.06; 95 % CI 0.87-1.30). Similar results were seen for both heart failure and atrial fibrillation/flutter. As compared to 2 years of therapy, 5 years of postoperative tamoxifen therapy prevents CHD as well as other heart diseases. The risk reduction is most apparent during the active treatment period, and later tends to diminish.
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| 3. |
- Rosell, Johan, et al.
(författare)
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Effects of adjuvant tamoxifen therapy on the incidence of secondary cancer : results from a randomized trial with long term follow-up
- 2014
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- BACKGROUNDTamoxifen is a well-established endocrine treatment for breast cancer. We here present results with respect to second primary cancer from a large randomized trial of 5 and 2 years of adjuvant tamoxifen. Breast cancer distant recurrence and mortality are also reported.METHODSOur study included 4128 postmenopausal patients with early stage breast cancer who were alive and free of breast cancer recurrence after 2 years of tamoxifen therapy. They were randomized to receive three more years of therapy or stop tamoxifen. In the comparison of 5 years versus 2 years of postoperative tamoxifen treatment hazard ratios were estimated using Cox regression for different follow-up periods defined as: During treatment (2-5 years) and after treatment (5-10 years, 10-15 years, > 5 years, > 10 years and > 15 years).RESULTSIn the five years group the incidence of lung cancer was halved (hazard ratio [HR], 0.45, 95% confidence interval [95% CI], 0.27-0.77 [P = .0038]), and lung cancer mortality was decreased. An increased risk was observed for endometrial cancer (HR, 1.83; 95% CI, 1.19-2.81 [P = .0059]), but this risk appeared to decrease over time. The risk of contralateral breast cancer was decreased (HR, 0.73; 95% CI, 0.56-0.96 [P = .022]), also in the period after treatment stopped. In the five years group, the risk of distant recurrence was decreased, and statistically significant reductions were observed both during treatment and in the five year period after treatment stopped. The breast cancer mortality was reduced, especially during the post-treatment phase.CONCLUSIONSIn this randomized study, tamoxifen substantially reduces the risk of new cancer both in contralateral breast and in lung up to 10 years after treatment stopped.
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| 4. |
- Rosell, Johan, et al.
(författare)
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Long-term effects on the incidence of second primary cancers in a randomized trial of two and five years of adjuvant tamoxifen
- 2017
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Ingår i: Acta Oncologica. - : Taylor & Francis. - 0284-186X .- 1651-226X. ; 56:4, s. 614-617
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Tidskriftsartikel (refereegranskat)abstract
- Background: Tamoxifen is a well established treatment for breast cancer, but its long-term effects on the incidence of secondary cancers are not fully evaluated.Material and methods: We have studied 4128 postmenopausal patients with early stage breast cancer who were alive and free of breast cancer recurrence after two years of tamoxifen, and who were randomized to receive totally two or five years of therapy.Results: Compared to patients randomized to two years of tamoxifen the incidence of contralateral breast cancer [hazard ratio (HR) 0.73; 95% CI 0.56-0.96] and of lung cancer (HR 0.45; 95% CI 0.27-0.77), especially squamous cell and small cell lung cancer, were reduced in the five-year group, and similar results were seen when restricting the analysis to the 10-year period after treatment stopped. An increased incidence of endometrial cancer was observed in the five-year group, but the excess risk decreased over time.Conclusion: Further studies of the effects of tamoxifen on the risk of different histological types of lung cancer are needed.
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| 5. |
- Rosell, Johan, et al.
(författare)
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Time dependent effects of adjuvant tamoxifen therapy on cerebrovascular disease : results from a randomised trial
- 2011
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Ingår i: British Journal of Cancer. - : Springer Science and Business Media LLC. - 0007-0920 .- 1532-1827. ; 104:6, s. 899-902
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Tamoxifen has been associated with an increased risk of stroke. There is, however, little information on the effect in the post-treatment period. Using data from the Swedish Breast Cancer Group adjuvant trial of 5 vs 2 years of tamoxifen treatment, we now report both short-term and long-term effects on morbidity as well as mortality because of cerebrovascular disease. METHODS: Data from the Swedish National Hospital Discharge Registry combined with information from the Swedish Cause of Death Registry was used to define events of disease. Hazard ratios (HRs) were estimated using Cox regression. RESULTS: Comparing patients randomised to 5 years of tamoxifen with patients randomised to 2 years of tamoxifen, the incidence of cerebrovascular diseases was increased (HR 1.70, 95% CI 1.05-2.75) during the active treatment phase and reduced after the active treatment period (HR 0.78, 95% CI 0.63-0.96), and the difference in HR between the two time-periods was significant (P 0.0033). The mortality from cerebrovascular diseases was increased during the treatment period (HR 3.18, 95% CI 1.03-9.87) and decreased during the post-treatment period (HR 0.60, 95% CI 0.40-0.90) with a significant difference in HR between the two periods of follow-up (P=0.0066). Similar results were seen for subgroups of cerebrovascular diseases, such as stroke and ischaemic stroke. CONCLUSION: In an adjuvant setting, tamoxifen was associated with an increased risk of cerebrovascular disease during treatment, but a decreased risk in the post-treatment period.
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