To test the validity of an invasive pattern grading score (IPGS) developed for oral squamous cell carcinoma (OSCC) as a prognostic indicator and to elucidate the relationship between the IPGS and clinical parameters.
Graduate Institute of Life Sciences, School of Medicine, National Defence Medical Centre and Tri-Service General Hospital, No. 325 Cheng-Kung Rd., Neihu, Taipei, Taiwan.