Each year on a day in January — the 15th, to be precise — I go to a Web site and post a message to hundreds of women I’ve never met, saying, essentially, “I’m still here.”

Within days, a thunderous chorus comes back, 200 voices, 300. A few of them ask, “How can this be?” Sometimes they begin, “I’m crying.” Many answer in kind: “I’m here, too. It’s now three years.” “Five years.” “Three months.” “Seven.”

What we’re doing, in a way, is checking for lights in the darkness.

Now there probably aren’t a lot of Web sites where the announcement that you’re around and breathing would cause anyone to take notice, let alone respond. But this is a site for people with Stage 4 breast cancer, something I’ve had for 17 years. The average life expectancy with the diagnosis is 30 months, so this is a little like saying I’m 172 years old: seemingly impossible. But it’s not. I first found I had the illness in 1988, and it was rediagnosed as Stage 4 in 1993. That’s 22 years all together, which is the reason I post each year on the anniversary of the day I learned my cancer was back: to let women know that it happens, that people do live with this for years.

I tell them that when the cancer returned, it came on so fast, spread so quickly, that I was given a year or two to live. Within months, the disease turned vicious. It started breaking bones from within, and was coming close to severing my spinal cord.