OSCC, Oral squamous cell carcinoma; SCC, squamous cell carcinoma; PCR, polymerase chain reaction, QRT PCR, real-time quantitative reverse transcription polymerase chain reaction; WDSCC, well-differentiated squamous cell carcinoma; MDSCC, moderately differentiated squamous cell carcinoma; PDSCC, poorly differentiated squamous cell carcinoma; SMA, smooth muscle actin. Here, SMN1 is linked to oral cavity squamous cell carcinoma.