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Case series of multiple primary cancers in single individuals: diagnostic and therapeutic dilemmas.
Background and Objectives : Cancer recurrence represents treatment failure; the development of new primary tumors is suggestive of persistent exposure to etiological risk factors or genetic predisposition due to mutations in multiple cell lines. Case presentation/Design/Methods : The first case is a 65-years-old Caucasian male who presented with esophageal and lung cancer diagnosed synchronously. Smoking was the common risk factor for both cancers, underscoring field cancerization. The diagnosis and management was a challenge and different from either cancer presenting alone. Multidisciplinary approach was used and led to good outcomes. The second case is a 72-years-old Caucasian male presenting a rare dilemma of genetic mutation leading to multiple primary gastrointestinal cancers in a single individual. The gene explaining this group of cancers has not been diagnosed yet and the field needs to be explored further. Conclusion : Multiple primary cancers can be secondary to a common environmental risk factor or genetic mutations.
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