Risk Factors for Esophageal Squamous Cell Carcinoma in Patients with Head and Neck Squamous Cell Carcinoma

<div>Ki67 immunohistochemical expression (Ki67 labeling index, Ki67 LI) in HNSCC operation tissues with or without secondary ESCC. (a) High Ki67 LI (&gt;45) and low Ki67 LI (≤45) in HNSCC operation tissues (immunohistochemistry; magnification ×100). (b) Bar plots representing high Ki67 LI in HNSCC with ESCC patients compared to HNSCC without ESCC patients.</div>

Journal of Oncology

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Figure 1

Figure 1: Risk Factors for Esophageal Squamous Cell Carcinoma in Patients with Head and Neck Squamous Cell Carcinoma 