Epidemiology of in situ and invasive breast cancer in women aged under 45.

Alcohol consumption was associated with an increasing trend in risk of regional/distant tumours but not of earlier stage tumours, indicating that alcohol may be involved in late-stage events.

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A test of heterogeneity showed some evidence of a difference in relative risk associated with parity for in situ tumours compared with regional/distant tumours (P = 0.05), but no significant difference between the risks for in situ and local (P=0.36), or local and regional/distant tumours (P=0.11). Among parous women, there was a borderline significant decreasing trend in RR with increasing parity for both in situ and local tumours.

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However, one would then expect a decreasing trend in RR of in situ tumours with increasing time since last birth, and this was not apparent.

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The risk of in situ tumours associated with frequent drinking was significantly less than of regional/distant tumours (P=0.01). There was a highly significant decrease in RR with increasing BMI for in situ tumours (P-value for trend=0.002), with heavy women at half the risk of lean women (RR = 0.45).

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