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Patent Pending Neoplasm (from Ancient Greek νεο- neo- "new" and πλάσμα plasma "formation, creation"), also commonly referred to as a tumor or tumour,[1] is an abnormal growth of tissue.[2] This abnormal growth usually but not always forms a mass.[3] The World Health Organization (WHO) classifies neoplasms into four main groups: benign neoplasms, in situ neoplasms, malignant neoplasms, and neoplasms of uncertain or unknown behavior.[4] A malignant neoplasm is a cancer.