When you grow old, your immune system also keeps becoming weak and every year you blood pressure also increases etc. 90 year old is not like 30 year old under same condition.
For advanced cases of lung and liver cancer
treatment is mainly palliative.Radiation
is appropriate treatment for him because of his age and stage of cancer. Cancer metastasis
is present (seems to be spreading to other organs like liver and lungs).
5 year survival is not very good.