Publications by authors named "A D Hoyes"

Very few studies investigating COVID-19 in cancer patients have included cancer patients as controls. We aimed to identify factors associated with the risk of testing positive for SARS CoV2 infection in a cohort of cancer patients. We analyzed data from all cancer patients swabbed for COVID-19 between 1 March and 31 July 2020 at Guy's Cancer Centre.

View Article and Find Full Text PDF

Exposure of the cranium to white light in mice that had been given haematoporphyrin derivative (HpD) led to a rapid onset of vasogenic cerebral oedema, cerebral necrosis, coma and death. Selectivity of the initial damage for endothelium was suggested by (a) early breakdown (less than 1 h) of the blood-brain barrier (BBB) as shown by increased permeability to Evans blue (b) separation and increased vesiculation of endothelial cells at 2 h and (c) endothelial cell pyknosis at 3--4 h in small vessels next to apparently undamaged neurones and neuroglia. There was no damage to myelin sheaths, and astrocytes showed only end-feet oedema, a reaction to exudation of protein-rich fluid.

View Article and Find Full Text PDF

Quantitative ultrastructural analysis revealed that the large dense-cored vesicles in the axon terminals in the myenteric ganglia of the guinea-pig stomach tend to be concentrated towards the ends of the terminals. In guinea-pigs treated with 50 mg/kg 5-hydroxydopamine, diameters of the vesicles were increased and their distribution in the terminals was altered. Treatment with reserpine prior to 5-hydroxydopamine increased the proportion of large dense-cored vesicles and decreased the overall number of vesicles in the terminals.

View Article and Find Full Text PDF

It was shown by ultrastructural investigation that, during the early stages of postnatal development of the rat ureter, some of the cells of the muscle coat undergo degeneration. These cells were rapidly eliminated by phagocytosis, mainly by other muscle cells. Following their incorporation into other muscle cells, the cells gradually became transformed into heterogeneous electron-dense bodies with the features of heterophagosomes.

View Article and Find Full Text PDF