( ( Acute ( lymphoblastic leukemia ) ) ( ( is ( ( the ( ( most common ) form ) ) ( of ( childhood cancer ) ) ) ) . ) )
(ROOT (S (NP (JJ Acute) (JJ lymphoblastic) (NN leukemia)) (VP (VBZ is) (NP (NP (DT the) (ADJP (RBS most) (JJ common)) (NN form)) (PP (IN of) (NP (NN childhood) (NN cancer))))) (. .)))
Acute lymphoblastic leukemia is the most common form of childhood cancer.
(ROOT (S (NP (NNP Leukemia)) (VP (VBZ is) (NP (NP (DT the) (ADJP (RBS most) (JJ common)) (NN type)) (PP (IN of) (NP (NP (NN cancer)) (VP (VBN developed) (PP (IN in) (NP (NNS children)))))))) (. .)))