(Blood vessels) may grow around tumors.Logical formLearned from13 sentences. (Tumor cells) can be sensitive to irradiation.Logical formLearned from13 sentences. Chemotherapy may assist a regrowth of tumors.Logical formLearned from13 sentences. A (brain tumor) may undergo a discovery.Logical formLearned from13 sentences. A tumor may progress.Logical formLearned from13 sentences. A (brain tumor) can be lethal.Logical formLearned from13 sentences. A (brain tumor) may pertain-to an elected-representative.Logical formLearned from13 sentences. Tumors can be on a face.Logical formLearned from13 sentences. A tumor can be hidden.Logical formLearned from13 sentences. A male may have a tumor.Logical formLearned from13 sentences. Tumors may pertain-to a rectum.Logical formLearned from13 sentences. A surface may pertain-to (tumor cells).Logical formLearned from13 sentences. A tumor can be in men.Logical formLearned from13 sentences. A tumor may undergo an examination.Logical formLearned from13 sentences. Stages can be constituted-of-or-filled-with (tumor progression).Logical formLearned from13 sentences.