Figure 1.

Distant metastasis-free survival, nodal relapse-free survival and overall survival of nasopharyngeal carcinoma patients with negative cervical lymph node involvement stratified according to the absence of retropharyngeal lymph node (RLN) metastasis (Group 1) and presence of RLN metastasis (Group 2).

Sun et al. BMC Cancer 2012 12:68   doi:10.1186/1471-2407-12-68
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