If they remove the tumor, why does breast cancer come back for some women and not others? | Dr. Carlo

Question 1

If they remove the tumor, why does breast cancer come back for some women and not others?

Accepted Answer

It comes back when a few tumor cells remain, too few for any test to detect. Later they grow, in the breast or far from it. A new tumor in either breast is a separate cancer, unrelated to the first. The risk is lower for early-stage cancer and higher when lymph nodes are involved or the cancer is triple-negative.

Question 2

If what's damaged is the brake on cell growth, won't it always come back even after they remove the tumor?

Accepted Answer

No. In most women, the broken brake exists only in the tumor, so removing the whole tumor ends the cycle. Inherited mutations like BRCA are different: every cell starts out with the brake only half working. So a new tumor can appear in either breast, and follow-up is key. A recurrence grows from cells left behind.

Question 3

Does the type, like grade 3 ductal or triple-negative, affect whether it comes back?

Accepted Answer

Yes, grade 3, with very disorganized, fast-dividing cells, raises the risk. Tumor size, lymph nodes and subtype also matter. Triple-negative cancer lacks hormone receptors and HER2, so those therapies don't help. It comes back more often, but usually responds well to chemo, its main treatment.

Question 4

If it's caught at stage 1, what treatment follows surgery to keep it from coming back?

Accepted Answer

After surgery, the oncologist builds the plan around hormone receptors and HER2. If the breast was preserved, most people get radiation. For hormone receptor-positive tumors, hormone therapy is added, usually for at least 5 years. HER2-positive ones usually get trastuzumab, and triple-negative ones may then get chemo.