“Knowing that there is something that requires all of your attention, that is potentially serious and even life-threatening, is better than not knowing at all,” he added.
Mr Cowan underwent 12 rounds of chemotherapy and a surgery, following which his scans in August showed he had no signs of cancer.
“From every metric we can measure, including my gradual return to normality, the potential is there for the best outcome,” he said.
“We took it one step at a time, looked for any and every positive and – to cut a long story short – here we are,” he added.