Breast cancer that has become resistant to first-line or second-line c
hemotherapy is a very difficult clinical situation, often involving a
woman who is still relatively healthy. It is in this setting in other
diseases that investigational treatments have been attempted, includin
g biological approaches. Even if the tumour is still responsive to che
motherapy given at high dose-intensity, the addition of a complementar
y strategy may well improve the long-term outlook for many patients. I
n the near future, anti-angiogenesis strategies will be available as a
treatment for many or most solid tumours, and ultimately, replacement
of oncogenes will be the method of choice for fundamentally attacking
a cancer at its source. Presently, recruitment of the patient's immun
e response as an important ally of chemotherapy must not be overlooked
.