Why is breast cancer so deadly?

It isn't!: When caught early the chance for cure is very high. This remains true for some advanced breast cancers, as well. Survival is dependent upon our ability to eradicate breast cancer cells that may have spread from the breast to vital organs (lungs, liver, bone etc). While chemotherapy isn't always effective, we have made tremendous advances over the past decade and expect more to follow.

Breast Ca: I do agree with dr.Rosen that much progress has been made regarding breast cancer.But if undetected in the early stages, it still can be deadly.15% of the breast cancers are triple negative--neg for estrogen, progesterone, and her2 receptors we have targeted treatments for 85%. Unfortunately, triple negative- we don't know enough-many subtypes-no targeted tx.Yet. This is more aggressive+/- deadly.

Depends: Dr. Rosen is correct that if breast cancer is found small and early that it is generally highly treatable with a 98% treatment success rate. There are some breast cancers, however, that may have more aggressive cells, hormone resistance, or aggressive dna types. Larger or neglected cancers are also more dangerous, with risk of spreading to other locations or other organs.