The earlier lung cancer is detected, the greater the chances of overcoming the disease. And now, it looks like man\'s best friend may be able to help in speeding up the diagnosis. In a report from the European Respiratory Journal, researchers reveal that dogs can be trained to sniff out lung cancer compounds in human breath samples. In tests involving 220 people - some had lung cancer, some did not - the dogs correctly identified non-cancer sufferers 93 per cent of the time and confirmed the presence of cancer cells in 71 per cent of samples. From / The National