Just think of cancer as one of the many difficulties you face in life and give your best to overcome it with positivity, said senior Goa police official Nidhin Valsan, who took part in the backbreaking Ironman competition a year after being declared free of the dreaded scourge. Speaking to PTI on Saturday on the occasion of World Cancer Day, Valsan, an Indian Police Service officer of the 2012 batch, said thinking of every difficulty as a challenge and not giving up hope is the key.