Publicacion dentro de su habitual boletin de Novedades del CLAP sobre un decalogo de metas para optimizar la Salud Materno Neonatal en Latinoamerica y el Caribe
http://www.smu.org.uy/emc/novedades/clap.pdf

Luego del estudio WHY, ultimo e importante trabajo presentado en The Lancet (Agosto 2003)sobre los efectos de la Terapia de Remplazo Hormonal y el Cancer de Mama. The Millon Women Study
Volume 362, Number 9382 09 August 2003
Lancet 2003; 362: 419-27
Breast cancer and hormone-replacement therapy in the Million Women Study
Million Women Study Collaborators

Correspondence to: Prof Valerie Beral, Cancer Research UK Epidemiology Unit, Gibson Building, Radcliffe Infirmary, Woodstock Road, Oxford OX2 6HE, UK
Summary
Background Current use of hormone-replacement therapy (HRT) increases the incidence of breast cancer. The Million Women Study was set up to investigate the effects of specific types of HRT on incident and fatal breast cancer.
Methods 1 084 110 UK women aged 50-64 years were recruited into the Million Women Study between 1996 and 2001, provided information about their use of HRT and other personal details, and were followed up for cancer incidence and death.
Findings Half the women had used HRT; 9364 incident invasive breast cancers and 637 breast cancer deaths were registered after an average of 2·6 and 4·1 years of follow-up, respectively. Current users of HRT at recruitment were more likely than never users to develop breast cancer (adjusted relative risk 1·66 [95% CI 1·58-1·75], p<0·0001) and die from it (1·22 [1·00-1·48], p=0·05). Past users of HRT were, however, not at an increased risk of incident or fatal disease (1·01 [0·94-1·09] and 1·05 [0·82-1·34], respectively). Incidence was significantly increased for current users of preparations containing oestrogen only (1·30 [1·21-1·40], p<0·0001), oestrogen-progestagen (2·00 [1·88-2·12], p<0·0001), and tibolone (1·45 [1·25-1·68], p<0·0001), but the magnitude of the associated risk was substantially greater for oestrogen-progestagen than for other types of HRT (p<0·0001). Results varied little between specific oestrogens and progestagens or their doses; or between continuous and sequential regimens. The relative risks were significantly increased separately for oral, transdermal, and implanted oestrogen-only formulations (1·32 [1·21-1·45]; 1·24 [1·11-1·39]; and 1·65 [1·26-2·16], respectively; all p<0·0001). In current users of each type of HRT the risk of breast cancer increased with increasing total duration of use. 10 years' use of HRT is estimated to result in five (95% CI 3-7) additional breast cancers per 1000 users of oestrogen-only preparations and 19 (15-23) additional cancers per 1000 users of oestrogen-progestagen combinations. Use of HRT by women aged 50-64 years in the UK over the past decade has resulted in an estimated 20 000 extra breast cancers, 15 000 associated with oestrogen-progestagen; the extra deaths cannot yet be reliably estimated.
Interpretation Current use of HRT is associated with an increased risk of incident and fatal breast cancer; the effect is substantially greater for oestrogen-progestagen combinations than for other types of HRT.





 

 

 

 

 


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Evaluation of Neoplasia of the Female Lower Genital Tract
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Acta Obstetricia et Gynecologica Scandinavica
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Baillière's Clinical Obstetrics and Gynaecology
Baillière's Clinical Paediatrics
Best Practice & Research - Clinical Obstetrics & Gynaecology
Birth: Issues in Perinatal Care
The Breast
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Fertility and Sterility
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Health Care for Women International
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