( ( ( The ( most ( common types ) ) ) ( of ( cancer ( that ( ( radiation therapy ) ( is ( used for ) ) ) ) ) ) ) ( ( are ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( brain tumors ) , ) ( head ( and ( neck cancers ) ) ) ) , ) ( lung cancer ) ) , ) ( breast cancer ) ) , ) ( prostate cancer ) ) , ) ( skin cancer ) ) , ) ( rectal ( cancer ( , ( cervix ( and ( uterine cancers ) ) ) ) ) ) ) , ) lymphoma ) , ) and ) sarcoma ) ) . ) )
(ROOT (S (NP (NP (DT The) (RBS most) (JJ common) (NNS types)) (PP (IN of) (NP (NP (NN cancer)) (SBAR (IN that) (S (NP (NN radiation) (NN therapy)) (VP (VBZ is) (VP (VBN used) (PP (IN for))))))))) (VP (VBP are) (NP (NP (NN brain) (NNS tumors)) (, ,) (NP (NN head) (CC and) (NN neck) (NNS cancers)) (, ,) (NP (NN lung) (NN cancer)) (, ,) (NP (NN breast) (NN cancer)) (, ,) (NP (NN prostate) (NN cancer)) (, ,) (NP (NN skin) (NN cancer)) (, ,) (NP (JJ rectal) (NN cancer) (, ,) (NN cervix) (CC and) (NN uterine) (NNS cancers)) (, ,) (NP (NN lymphoma)) (, ,) (CC and) (NP (NN sarcoma)))) (. .)))
The most common types of cancer that radiation therapy is used for are brain tumors, head and neck cancers, lung cancer, breast cancer, prostate cancer,  skin cancer, rectal cancer, cervix and uterine cancers, lymphoma, and sarcoma.
(ROOT (S (NP (JJ Prostate) (NN cancer)) (VP (VBZ is) (NP (NP (DT the) (ADJP (RBS most) (JJ common)) (NN type)) (PP (IN of) (NP (NP (NN cancer)) (PP (IN in) (NP (JJ adult) (NNS males))))))) (. .)))