Please summarise for me the scientifically acceptable evidence
(properly run randomised trials) for Surgery, Radiotherapy, and
Chemotherapy to produce a significant impact on survival for each of
the most common forms of cancer. Please indicate if your research
shows that any of these treatments do more harm than good - which
treatments for which cancers?

With 5 year survival, please take into account that people may not be
living longer after they get cancer; they may be living longer after
the diagnosis. Modern diagnostic techniques make it possible to
identify cancer and more of it, earlier than before. So, while there
is a longer interval between diagnosis and death to try out various
conventional treatments, actual life may not have really got longer.

Please also contrast the 5 year horizon taken as the definition of
'survival' with a 10 year horizon or a 20 year horizon.