Cancer is a scary diagnosis for anyone, and adolescents and young adults can have an especially hard time dealing with the news that a parent is sick. But you are far from alone. About 2.5 million teens live with a parent who is fighting or survived cancer.

I was diagnosed with an aggressive, stage IV breast cancer in 2013, after finding a lump. The cancer had already spread to five organs, including my brain. I was therefore immediately considered a terminal case.

When I was diagnosed with breast cancer in 2015, my boyfriend Michael and I were still in the beginning stages of our relationship.

It was 2005, and 47-year-old Rick Crowley had a lump growing in his neck. The first biopsy indicated that it was benign, but his doctors in Olean, New York, were not convinced. A good thing, too: The second biopsy found cancer.

I tried to ignore the pain and the feeling of being “off.” But one day, after struggling through a few minutes of yet another bad run, I stopped in mid-stride, pulled out my phone, and called my doctor.

Once a month, Kathy Halliday of Snyder, N.Y. comes to Roswell Park Comprehensive Cancer Center laden with armfuls of donations, items she made with her own two hands, to be given to patients in need of warmth or spiritual comfort.

Not all patients respond to all types of immunotherapies. So how can doctors identify which treatments have the best chance of working in a specific patient? How can they quickly zero in on the best options on a list of immunotherapies that grows longer every day?