Hello and welcome to HCM
Linitis plastice is an aggressive type of gastric cancer
In your fathers case the cancer has spread to other organs of the body.
It is difficult to predict the survival period however, the it should be made as comfortable as possible for your father.
There is palliative care
for terminally ill patients.
My advice is to make his rest of life as comfortable as possible with analgesics for his back pain
, pareneteral feeding as he is not able to feed orally and catherization if he is not able to pass urine.
And most important love, care and support.
Thanks and take care
Dr Shailja P Wahal