Dad stopped treatment - we're trying to get a prognosis but can't get a straight answer

Hello, 

I'm struggling to get a prognosis for my dad from anyone.

My 76 year old dad has stage IV oesophageal cancer. He had a successful oesophagectomy in April 2024 and has never had any issues with eating or swallowing etc so had a normal bmi.

Fast forward to Oct 2025, he lost some weight and liver metastases were found, although only small. He started chemotherapy and immunotherapy in late December and managed 5 rounds over 15 weeks. Unfortunately he ended up in hospital due to side effects pretty much straight away after the last 3 rounds with a temperature, very low BP and low blood o2. He has decided with our full support to stop all treatment as his bmi has massively dropped to 15.7 as his appetite and taste have been non existent.

There are now metastases in his bones and lung. He is sleeping alot of the day and has lost nearly 1 stone in less than 4 weeks. My mum has asked his oncologist how much time dad may have statistically but wasn't given a straight answer. 

I realise you cannot give a personal prognosis for him but could you provide some statistics based on the information I have supplied please? We just need to prepare ourselves mentally. 

Thank you