( ( ( The ( ( most common ) type ) ) ( of ( oral cancer ) ) ) ( ( is ( squamous ( cell carcinoma ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (ADJP (RBS most) (JJ common)) (NN type)) (PP (IN of) (NP (JJ oral) (NN cancer)))) (VP (VBZ is) (NP (JJ squamous) (NN cell) (NN carcinoma))) (. .)))
The most common type of oral cancer is squamous cell carcinoma.
(ROOT (S (NP (JJ Squamous) (NN cell) (NN carcinoma)) (VP (VBZ is) (NP (DT the) (JJ second) (ADJP (RBS most) (JJ common)) (NN skin) (NN cancer))) (. .)))