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The signs and symptoms of benign or malignant tumours result for the most part from the local effects of either the primary tumour or its metastases. In some cases the primary tumour and the secondary metastases do not progress at the same pace, and in such an instance the primary tumour may manifest itself while the metastases do not cause symptoms and, as a result, go undetected for years. In addition to local effects, malignant neoplasms produce systemic effects such as body wasting (cachexia) and a variety of clinical manifestations known as paraneoplastic syndromes. Both local and systemic effects are ...(100 of 21846 words)