Fig. 1From: Clonal relationship of synchronous head and neck cancer and esophageal cancer assessed by single nucleotide polymorphism-based loss of heterozygosity analysisDiagram showing the classification criteria for LOH result interpretation. SNP, single nucleotide polymorphism; LOH, loss of heterozygosity; HNSCC, head and neck squamous cell carcinoma; SFT, second field tumor; SPM, second primary malignancyBack to article page