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Table 2 Relative risk of subsequent compared to US population by prior cancer history

From: Are rare cancer survivors at elevated risk of subsequent new cancers?

Prior cancer history N # New cancers Follow-up years since enrollment Risk relative to US populationa
No prior cancer 5684 289 29,680 1.27 (p < 0.0001)
≥1 prior common cancer 8604 723 53,618 0.99 (p = 0.82)
≥1 prior rare cancer 2342 145 10,352 1.22 (p = 0.01)
  1. aRelative risk = rate of new cancers observed in study population divided by expected rate in US population based on SEER data