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The cytotoxics developed for the treatment of patients with advanced colorectal cancer have yielded diminishing returns. Agents aimed at novel molecular targets are required to improve the prognosis of this disease. This review describes the most recent advances in the clinical development of therapies designed to block the function of several important signalling cellular proteins. Therapies discussed include agents targeting: (i) the epidermal growth factor receptor (EGFR) family; (ii) Ras  via  the inhibition of farnesyltransferase; (iii) Raf kinase; (iv) the mitogen-activated protein kinase pathway (MAPK, MEK, Erk); (v) Akt; and (vi) the apoptosis signalling pathways including NF-κB, Bcl-2 and the TRAIL receptor. The results of clinical trials of the first generation of such therapeutics to enter clinical evaluation in malignant diseases are presented. Potential advantages and disadvantages of these different therapeutic modalities are discussed and future challenges for the evaluation of these targeted agents in the clinic is presented.

Therapeutics targeting signal transduction for patients with colorectal carcinoma