( ( ( Exposure ( to sunlight ) ) ( -LRB- ( ( UV radiation ) -RRB- ) ) ) ( ( ( ( causes ( ( ( almost all ) cases ) ( of ( ( basal and ) ( squamous ( cell ( skin cancer ) ) ) ) ) ) ) and ) ( is ( ( a ( major cause ) ) ( of ( skin melanoma ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (NNP Exposure)) (PP (TO to) (NP (NN sunlight)))) (PRN (-LRB- -LRB-) (NP (NNP UV) (NN radiation)) (-RRB- -RRB-))) (VP (VP (VBZ causes) (NP (NP (QP (RB almost) (DT all)) (NNS cases)) (PP (IN of) (NP (NP (NN basal)) (CC and) (NP (JJ squamous) (NN cell) (NN skin) (NN cancer)))))) (CC and) (VP (VBZ is) (NP (NP (DT a) (JJ major) (NN cause)) (PP (IN of) (NP (NN skin) (NN melanoma)))))) (. .)))
Exposure to sunlight (UV radiation) causes almost all cases of basal and squamous cell skin cancer and is a major cause of skin melanoma.
(ROOT (S (NP (NNP Sunlight)) (VP (VBZ is) (NP (NP (DT the) (VBG leading) (NN cause)) (PP (IN of) (NP (NN skin) (NN cancer))))) (. .)))