Medical experts have warned people to watch for four warning signs in the leg that could signal a fatal illness responsible for claiming nearly 10,000 lives in Britain annually. The "first clue" to pancreatic cancer might manifest in the limbs. Health authorities state that pancreatic cancer - the fifth leading cause of cancer-related deaths across the UK - can trigger a condition called deep vein thrombosis, commonly known as DVT. This develops when a blood clot forms within a major vein,