( Some ( ( develop ( ( leukemia , ) ( ( a type ) ( of cancer ) ) ) ) . ) )
(ROOT (S (NP (DT Some)) (VP (VBP develop) (NP (NP (NN leukemia)) (, ,) (NP (NP (DT a) (NN type)) (PP (IN of) (NP (NN cancer)))))) (. .)))
Some develop leukemia, a type of 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)))))))) (. .)))