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Stage of cancer at diagnosis (e.g. localised, regional involvement, metastatic) is an important predictor of survival. This paper identifies there is cause for concern surrounding the 40% of "unknown" or unrecorded stage of diagnosis on prostate cancer patient records in NSW. This means crucial information is missing from their records. The second stage of this project, scheduled for completion in late 2014, is to identify the reasons for these missing data. Once this has been completed we can inform policy makers to ensure the data completeness can be improved. Studies using cancer staging data can then increase in quality and quantity.