The concomitant use of radiotherapy and chemotherapy resulted in a significantly improved locoregional control rate and a reduction of the need for colostomy in patients with locally advanced anal cancer without a significant increase in late side effects.

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Using CFS as our main end point, we did not find an advantage for either ICT or HD radiation boost in LAACC. Nevertheless, the results of the most treatment-intense arm B should prompt the design of further intensification studies.