Indicate true (T) and false (F) statements below regarding cancer incidence and cancer prevention. Your answer would be a four-letter string composed of letters T and F only, e.g. TFFF.
( ) Over half of all cancers are preventable by lifestyle changes.
( ) The age-adjusted cancer death rates have increased steadily since 1900, mostly due to the industrial way of life.
( ) Currently, more than half of all cancer patients survive at least five years post-diagnosis.
( ) About half of all cancers are thought to arise by infection with viruses, bacteria, or parasites.