A major reason for poor survival rates is late diagnoses, by which time the cancer cells have spread to secondary sites. (sciencedaily.com)
Higher levels of hypoxia in a tumour are strongly linked to poor survival rates in cancer patients, he said, and hypoxic tumours are often resistant to treatment. (sciencedaily.com)
Some historical evidence suggests that, in ancient times, first babies had particularly poor survival rates, and slow lactogenesis following a first birth may have been a significant part of it. (skepticalob.com)