Stem cells bred to kill cancer tumours British researchers have developed what they call seek-and-destroy stem cells that hit tumours with a cancer-killing protein but spare healthy tissue. The technique is based on two previous studies: one showing that certain bone-marrow stem cells innately seek out cancers and another showing how these cells can make an anti-cancer protein. The University College London team, which hopes to begin human trials in two years, has so far used the stem cells to target lung, squamous, breast and cervical cancers in mice and cell cultures. Another advantage is that the stem cells aren't rejected by the body, so they can be made in batches, rather than having to be tailored for each patient, Reuters reports. Bone-morrow jabs help heart patients Dutch researchers have used bone-marrow injections to restore blood flow in the damaged hearts of patients suffering severe angina and for whom there was little hope of recovery. The results were so good - halving the amount of blockage, on average - that patients in the three-month Leiden University Medical Centre study who received placebos were subsequently given the bone-marrow injections. The researchers aren't sure exactly how the bone-marrow cells promote the creation of new blood vessels, healthday.com reports. Green tea may stop spread of HIV A chemical in green tea is so effective at blocking sexual transmission of the human immunodeficiency virus (HIV) that researchers from the University of Heidelberg say it should be used in vaginal creams to supplement antiretrovirals. The same team recently found that a protein in sperm actually helps HIV to infect cells, AFP reports. But they say a green tea polyphenol called epigallocatechin-3-gallate (EGCG) neutralises this protein. Adding EGCG to topical creams would 'provide a simple and affordable prevention method' against HIV transmission. Ginger cuts chemo-induced nausea Ginger appears to significantly reduce the nausea often caused by chemotherapy, say US researchers, based on a study of almost 650 people - but the key may be to start taking it several days before treatment. 'We were slightly beside ourselves' to see how much it helped, says team leader Julie Ryan, of the University of Rochester. Those who took ginger capsules for six days, starting three days before treatment, had fewer and less severe bouts of nausea than those given placebos, AP reports. Almonds could boost immune system Almonds may markedly boost the body's immune system, particularly in combatting infection and chronic diseases, say British researchers, based on lab trials. The Institute of Food Research team studied the effect of digested natural almond skins on the release of immunological compounds in cells, some of which were infected with a virus. Adding almond skins led to a significant decrease in virus replication, Reuters reports. The study was funded by the Almond Board of California.