- Gene expression and benefit of chemotherapy in women with node-negative, estrogen receptor-positive breast cancer. Paik, S., Tang, G., Shak, S., Kim, C., Baker, J., Kim, W., Cronin, M., Baehner, F.L., Watson, D., Bryant, J., Costantino, J.P., Geyer, C.E., Wickerham, D.L., Wolmark, N. J. Clin. Oncol. (2006)