Last October, just a few days after completing the Tomaree headland walk, the retired post office owner began complaining about reflux and indigestion.

Unaware of the seriousness of the condition, Mr Shaw began taking his wife Anne's medication for the condition but it did not improve.

"I eventually went to see my doctor and he immediately sent me to have an endoscopy which revealed the worst possible news ... I was told I had oesophageal cancer and that it was terminal," he said.

"I am having treatment and trying to remain positive. We have three grandchildren and I want to watch them grow up into adults."

While Mr Shaw's cancer - a tumour in his stomach, liver and lymph nodes - has turned the family's world upside down, it has also prompted them to warn others.

"We cannot emphasise enough the importance to get yourself checked out if you suffer from indigestion or reflux ... it may just save your life."

Daughter Samantha Hoggard has taken it upon herself to establish a charity effort to assist research into the debilitating disease.

"Dad has always encouraged me to be whatever I wanted and he has given me the confidence to know that I can achieve anything," Ms Hoggard said.

"So I have decided to enter into the 22-kilometre half marathon on Saturday, April 19, at the Newcastle Running Festival.

"I know every stride I take Dad will be running with me and I am hoping he will make the final few steps to be able to cross the finish line with me."

Her goal is to raise $5000. Her boss Gill Wedmore, from Bulk Flyash Grout in Heatherbrae, has committed to matching dollar for dollar.

To donate, go to gofundme.com/mifpt4.