“In a world where trimodality therapy has been the standard of care for so long, it’s remarkable to think that some of these cancers can be cured with a single systemic agent alone.”
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The world of cancer treatment is a rapidly evolving creature, and rectal cancer is no exception. In particular, locally advanced rectal cancer has a number of valid treatment options. While it’s traditionally a surgical disease, in some cases we now have evidence for watch-and-wait approaches that spare patients the morbidity and toxicity associated with oncologic resections. But even when the goal is to get the patient to a total mesorectal excision (TME), several nuances can influence decision making. Suddenly, talking to a patient about rectal cancer has become as lengthy a discussion as those we have with intermediate-risk prostate cancer patients.
We currently have good evidence to suggest that total neoadjuvant therapy (TNT) should be standard of care for locally advanced rectal cancers. But even within this algorithm of chemotherapy and chemoradiation followed by surgery, questions abound. Which treatment should we start with? Which chemotherapy should be used? What radiation fractionation should we employ? And which concurrent chemotherapy should be paired with radiation? While the 5-year follow-up of the RAPIDO trial demonstrated a statistically significant increase in the locoregional recurrence rate (10% vs 6%) with short course radiation,1 this must be viewed through a critical lens, given that the two arms did not directly compare short-and long-course radiation. Perhaps it was the addition of neoadjuvant chemotherapy, delaying surgery, that resulted in a detriment to the locoregional control. Thus, short-course radiation is still indicated as a reasonable treatment option per NCCN guidelines.