– mast cell – mastectomy – mastocytoma – matrix metalloproteinase – MDL 101,731 – MDX-060 – mean survival time – measurable disease – mechlorethamine – MEDI-507 – medial supraclavicular lymph node – median survival time – mediastinal pleura – mediastinoscopy – mediastinum – medical castration – medical oncologist – medroxyprogesterone – medullary breast carcinoma – medullary thyroid cancer – medulloblastoma – mega-voltage linear accelerator – megestrol – meiosis – melanocyte – melanoma – melanoma vaccine – melphalan – MEN-10755 – MEN1 syndrome – meningeal – meningeal metastases – meningioma – menopausal hormone therapy – mercaptopurine – mercury – Merkel cell cancer – mesenchymal – mesenteric membrane – mesna – mesonephroma – mesothelioma – metaplasia – metaplastic carcinoma – metastasectomy – metastasis – metastasize – metastatic – metastatic cancer – metasynchronous – meteorism – methotrexate – methoxsalen – Methoxy polyethylene glycol-epoetin beta – methyl-5-aminolevulinate – methylphenidate – methylprednisolone – metoclopramide – metronidazole – metronomic therapy – Mexican valerian – MG98 – microcalcification – micrometastases – micromolar – microsatellite – microsatellite instability – microstaging – microwave therapy – microwave thermotherapy – mifepristone – Miraluma test – misoprostol – mistletoe lectin – mitochondria – mitolactol – mitomycin – mitosis – mitotane – mitotic activity – mitotic index – mitotic inhibitor – mitoxantrone – mivobulin isethionate – mixed glioma – MLN2704 – modafinil – modality – modified radical mastectomy – Mohs surgery – molar pregnancy – molecular risk assessment – molecularly targeted therapy – monoclonal antibody – monoclonal antibody 3F8 – monocyte – Montanide ISA-51 – Morinda citrifolia – morphology – motexafin gadolinium – moxifloxacin – MPNST – MRI – MRSI – MS 209 – MS-275 – mucinous carcinoma – mucosa-associated lymphoid tissue lymphoma – muJ591 monoclonal antibody – Müllerian tumor – multicenter study – multicentric breast cancer – multidrug resistance – multidrug resistance inhibition – multifocal breast cancer – multimodality treatment – multiple endocrine adenomatosis – multiple endocrine neoplasia syndrome – multiple endocrine neoplasia type 1 syndrome – multiple myeloma – multiple sclerosis – multiplicity – muromonab-CD3 monoclonal antibody – musculoskeletal – mycophenolate mofetil – mycosis fungoides – mycostatin – myelin – myeloablation – myelodysplasia – myelodysplastic syndrome – myelofibrosis – myelogenous – myelogram – myeloid – myeloma – myeloproliferative disorder – myelosclerosis with myeloid metaplasia – myelosuppression – myelosuppressive therapy – myometrium N N-acetylcysteine – N-acetyldinaline – N-butyl-N-(4-hydroxybutyl) nitrosamine – naloxone – National Cancer Institute – National Institutes of Health – natural