Stage 4 is a advanced stage, palliative care
to drain bile by putting stent in duct is undertaken to flow the bile into the system.
Radiotherapy and chemotherapy
are given for palliation.
is the best judge to institute these as per clinical condition.
With modern cancer drugs sometimes it is possible to prolong longevity, drainage of bile by putting stents is taken up endoscopically(ERCP) if it is possible at this stage to relieve jaundice
Trust your doc.and follow his advice