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Cancer occurs due to the uncontrollable growth of the cells which are not normal. The cancer can be malignant or benign. This paper focuses on the various technologies for the detection of breast cancer, lung cancer and brain tumor along with its internal operations. The techniques to retrieve the small and large sixed cancer affected cells are discussed. The cancer analysis process includes the following stages: gathering of input, preparing the list, brightening the image, partitioning, extracting the features and detecting the extracted features. The MRI scanned images are now a day's used for the analysis of cancer and tumors. In this paper we can discus about the various imaging methodologies used to analyze and detect the cancer affected cells.