After my wife was diagnosed with breast cancer, the thing she dreaded most wasn't the surgery at all - it was chemotherapy. She told me the first picture that came to mind was losing her hair, throwing up, her whole body falling apart. So "I'd rather die than do chemo" became something she'd say almost every day. Watching from the side, I could see exactly how much that fear was weighing on her, and it made me want to really understand: in what cases can you actually skip chemo?
The first thing I learned is that not all breast cancer is the same breast cancer. Whether the hormone receptors are positive (estrogen and progesterone), whether the protein called HER2 is positive or negative, and the Ki-67 number that tells you how fast the cancer cells are growing - depending on how all of these line up, the direction of treatment can change quite a bit. The hormone-positive, HER2-negative type is generally said to be on the milder end, and in that case there's a path that leans on hormone therapy (anti-hormone medication) instead of chemo.
But it's not as if "hormone-positive automatically means no chemo." The size of the tumor, whether it has spread to the lymph nodes, how high the Ki-67 is - all of these are variables. For patients sitting in that gray zone, they take out the tumor and run a genomic test (the ones often called Oncotype or MammaPrint), and if the score comes back low, they skip chemo and go with hormone therapy alone; if it comes back high, they add chemo. I'm told that things like whether it's multifocal - scattered in several spots rather than a single lump - or whether a mastectomy is being done are also part of the picture the doctor is drawing.
What put our minds a little more at ease was learning that the decision to do chemo or not isn't something the patient or the family settles on a hunch - it's decided based on these test results. If the score actually comes back low, you get to hear "you don't have to do it" straight from the doctor's own mouth; and if the score is high, then even though it's frightening, doing it is what's in your own best interest. So instead of locking in "absolutely not" from the start, I tried to reassure my wife: let's see the results and decide together.
When I look at others in the same situation, there are more people than you'd think who get by on hormone therapy alone, without chemo. People living ordinary lives, taking one pill a day and going in for regular check-ups. Of course the hormone medication has its own side effects too, like hot flashes and stiff, achy joints. Even so, plenty of accounts say that, compared to chemo, keeping up with daily life is far more manageable - and that was a big comfort to my wife.
We're still waiting on the test results right now, so we haven't reached a conclusion, but at least we seem to be past the stage of being scared for no reason. If anyone out there is wrestling with the same worry, I'd say start by confirming exactly what subtype your tumor is, and be sure to talk with your own doctor about whether a genomic test is an option for you. What I've written here is only what I looked into as a caregiver, so please make the actual treatment decision after talking it through thoroughly with your own physician.