India, Oct. 18 -- A new blood test has shown promising results in detecting over 50 types of cancer, including hard-to-diagnose ones like pancreatic, ovarian and head and neck cancers. London (PAMedia/dpa) - A blood test that screens for more than 50 cancers is correct in 62% of cases where it thinks people may have the disease, a study has found. The Galleri test, which can be given annually and is being trialled in the UK's health system, looks for the "fingerprint" of dozens of deadly cancers, often picking up signs before symptoms even appear. It works by identifying DNA in the bloodstream that has been shed by cancer cells, giving the earliest signs somebody may have the disease. Now, a key US trial on the test has shown that Galleri i...