The Evolving Field of Neoadjuvant Therapy in Locally-advanced Rectal Cancer: Evidence and Prospects.

The standard treatment of locally advanced rectal cancer comprises neoadjuvant chemoradiation followed by total mesorectal excision. This strategy provides low local recurrence rate, however distant recurrence is still an issue and may impact on survival rates. Novel approaches in the neoadjuvant setting have been tested to improve early and late outcomes, as well as to reduce treatment-related toxicity and morbidity. In this review, we discuss the current literature of neoadjuvant treatment in locally advanced rectal cancer, including total neoadjuvant methods, protocols for radiation delivery, chemotherapy regimen and efforts to add novel targeted therapies, selective withdrawal of surgery or radiotherapy, and future perspectives. Moreover, we highlight relevant issues that have emerged with these new treatment possibilities.