Treatment of large and locally advanced breast cancers using neoadjuvant chemotherapy

Psychological factors can predict the response to primary chemotherapy in patients with locally advanced breast cancer

This study evaluated the possible value of psychological variables in predicting clinical and pathological response to primary chemotherapy. 96 women with newly diagnosed large, or locally advanced, breast cancer (T2 > 4 cm, T3, T4, N2 and M0) participated in a prospective, randomised trial to evaluate the effects of relaxation training with guided imagery and L-arginine on response to primary chemotherapy. Before the first of six cycles of primary chemotherapy, women were assessed using the Hospital Anxiety and Depression Scale (HADS) and the Eysenck Personality Questionnaire (EPQ). The primary outcomes were clinical response (evaluated using standard International Union Against Cancer (UICC) criteria) and pathological response (graded by means of a previously published 5-point scale) following primary chemotherapy. Stepwise linear regressions were used to estimate the predictive value of age, menopausal status, clinical nodal status, tumour size at diagnosis, oestrogen receptor status, dietary supplementation (L-arginine versus placebo), personality (EPQ-L scores), mood (HADS scores) and a psychological intervention. HADS depression score was a significant independent predictor of pathological response to chemotherapy. HADS anxiety score was a significant independent predictor of clinical response. Because the original tumour size before chemotherapy (also a significant predictor of clinical and pathological responses) was taken into account in the analyses, the results cannot be explained in terms of psychobiological factors related to tumour size. This study supports the importance of psychological factors as independent predictors of response to primary chemotherapy in patients with breast cancer. If they can be replicated, these findings have major implications for the management of women with breast cancer. Psychological factors need to be assessed and evaluated in future trials of chemotherapy.

The role of radiation therapy for primary breast cancer

Radiation therapy for breast cancer has gone through two revolutions in the last two decades: the routine use of radiation therapy in conjunction with breast-conserving surgery as an equivalent treatment to mastectomy, and the use of radiation therapy following mastectomy in advanced or node-positive disease. Indeed, the perception of postmastectomy radiation has gone full circle: from having no benefit when used for all cases, to being detrimental because of cardiac irradiation, to the present in which the selective use of irradiation in high-risk patients provides both an improvement in local control and an improvement of 8% to 10% in the survival rate. Improvements in radiation technique have reduced complications, in particular late cardiac deaths. The major issues still to be resolved are the targets for postmastectomy irradiation, determining which patients do not need radiation therapy for DCIS and for node-negative disease, and the efficacy of delivering radiation to just the affected quadrant rather than to the whole breast. At present, most patients approach radiation therapy for breast cancer with the knowledge that it has a very high probability of being successful.

Receptor-mediated and enzyme-dependent targeting of cytotoxic anticancer drugs

This review is a survey of various approaches to targeting cytotoxic anticancer drugs to tumors primarily through biomolecules expressed by cancer cells or associated vasculature and stroma. These include monoclonal antibody immunoconjugates; enzyme prodrug therapies, such as antibody-directed enzyme prodrug therapy, gene-directed enzyme prodrug therapy, and bacterial-directed enzyme prodrug therapy; and metabolism-based therapies that seek to exploit increased tumor expression of, e.g., proteases, low-density lipoprotein receptors, hormones, and adhesion molecules. Following a discussion of factors that positively and negatively affect drug delivery to solid tumors, we concentrate on a mechanistic understanding of selective drug release or generation at the tumor site.