Annals of Oncology 14:71-73, 2003
© 2003 European Society for Medical Oncology
Original Paper |
Cancer risk in women with previous breast cancer
1 Cancer Epidemiology Unit and Cancer Registry of Vaud, Institut Universitaire de Médecine Sociale et Préventive, Lausanne; 2 Cancer Registry of Neuchâtel, Neuchâtel, Switzerland; 3 Laboratory of Epidemiology, Istituto di Ricerche Farmacologiche Mario Negri, Milan; 4 Istituto di Statistica Medica e Biometria, Università degli Studi di Milano, Milan, Italy
Received 5 August 2002; accepted 28 August 2002
Background:
Excess risks of several second neoplasms following breast cancer have been reported. However, these risks have still to be quantified.
Patients and methods:
We considered 9729 breast cancer patients registered by the Swiss Cancer Registries of Vaud and Neuchâtel (covering about 786 000 inhabitants) and followed up from 1974 to 1998.
Results:
Overall, 443 second primary neoplasms (other than second primary breast cancers) were observed versus 389 expected [standardised incidence ratio (SIR): 1.14; 95% confidence interval (CI) 1.041.25]. The SIRs were above unity for endometrium (SIR = 1.5), ovary (1.3), colorectum (1.1), gallbladder (1.4), cutaneous malignant melanoma (1.4), kidney (1.4), lymphomas (1.4) and leukaemias (1.2), as well as for selected tobacco-related neoplasms. The largest excess risk was found for soft tissue sarcomas (STS) with 10 cases observed versus 3.1 expected (SIR = 3.2; 95% CI 1.55.9). Of these, eight occurred in potentially irradiated areas.
Conclusions:
This analysis confirms the existence of a modest excess in several neoplasms occurring after breast cancer. The substantial excess of STS confirms the strong association between irradiation and STS.
Key words: breast cancer, follow-up study, population-based, second primary cancer, soft-tissue sarcoma, standardised incidence ratio
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