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Trends and standardized incidence ratio (SIR)* for (a) AIDS-related Kaposi's sarcoma and (b) classic Kaposi's sarcoma in the US population from 1980 to 2005 (SEER-9). (* SIR per 100 000 people per year, age-standardized to the 2000 US population. Relative changes in rate across nine SEER registries shown on a linear scale; P < 0·05.) SEER, Surveillance Epidemiology and End Results.
