Amy needed a mastectomy and underwent chemotherapy and was unable to compete with a celebrity partner on Strictly in 2023.
In February 2024, Dowden announced she had "no evidence of disease" following tests.
"Two years ago I found my lump and my gut instinct told me it wasn't good," the dancer said in a post on Instagram on Saturday.
"I was in Blackpool about to do a full day in the ballroom with all my students.
"That morning in the shower is when my heart sunk. I was also flying off on my long-awaited honeymoon the next day.
"I knew in my gut it wasn't right. The entire time I was away I was checking it every day and googling when Ben wasn't looking.
"I remember one day cycling back to our villa and actually thinking this might be my last holiday. Your mind spirals so quickly.
"So much has changed since then but I am so proud of how far I've come."