The progression of carcinomas to high-grade malignancies is accompanied by profound histological changes in the tumor-associated stroma. Although previous studies have suggested that mesenchymal cells of the stroma undergo genetic alterations during this progression, a new study now provides evidence that strongly contradicts this theory of stromal cell coevolution.
Democrat Barack Obama's appeal to  centrist voters has further opened the door to Republican claims his message of change only applies to the positions he has taken in the past.
AP - Iran indicated Saturday that it has no plans to meet a key Western demand that it stop enriching uranium, a day after Tehran sent the European Union a response to an international offer of incentives for halting enrichment.
AP - The call girl involved in a scandal that brought down New York's former governor has dropped a lawsuit claiming "Girls Gone Wild" founder Joe Francis exploited her image and name on the Internet.
