Patients diagnosed with new cancer who have a history of cancer may be excluded from clinical trials and underrepresented in research.
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‘A subsequent cancer is among patients with a history of cancer is important for understanding ongoing or new cancer risk in survivors.’
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Who and When: 740,990 people diagnosed with new cancer from 2009 through 2013. 
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What (Study Measures): Prior cancer among people diagnosed with a new cancer.
How (Study Design): This is an observational study. Because researchers are not intervening for purposes of the study they cannot control natural differences that could explain study findings.
Results: The frequency of prior cancer among patients diagnosed with new cancer ranged from 3.5 percent to 36.9 percent and most prior cancers were diagnosed in a different cancer site.
Patients diagnosed with new cancer who have a history of cancer may be excluded from clinical trials and underrepresented in research. Understanding the impact of prior cancer is important to improve research, disease outcomes and patient experience.
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