Sir, since cancer
from the normal
cells, symptoms are also very subtle and one has to be really watchful to see any thing persisting beyond the routine period. Cancer preventive clinics are there and they routinely screen for most of the cancers. But so far
there is no one particular approved test to say if malignant cells are present. Many labs have introduced some
blood investigations to diagnose malignant cells in body but due to lack of specific information they are not approved for routine screening.