The Suitability of Sniff Dog as a Tool in Screening Tumors

This study is testing whether specially trained dogs that can detect cancer by smell can reliably identify cancer from patient samples (such as urine or breath), as a potential low-cost, non-invasive cancer screening tool. **You may be eligible if...** - You have been diagnosed with a specific type of cancer (such as prostate, breast, or lung cancer, depending on the study arm) - You are willing to provide biological samples (such as urine or breath) for the trained dogs to assess - You are willing to participate in a control group if you do not have cancer, to allow comparison - You are at least 18 years old **You may NOT be eligible if...** - You have received certain treatments (such as chemotherapy or radiotherapy) recently, which may alter the scent profile - You have conditions that may confuse the scent results (such as active infections) - You are pregnant - You cannot provide a usable sample Talk to your doctor to see if this trial is right for you.