# Prophylactic effect of the traditional Chinese medicine formula danxiong granules (TDX105) on hand–foot skin reaction associated with the antitumor targeted drug regorafenib: a randomized, double-blind, placebo-controlled trial

## TL;DR

A traditional Chinese medicine called Danxiong Granules (TDX105) was found to reduce the incidence and severity of a common side effect of the cancer drug Regorafenib.

## Contribution

This is the first randomized, placebo-controlled trial showing that TDX105 can effectively prevent hand–foot skin reaction caused by Regorafenib.

## Key findings

- TDX105 reduced the incidence of hand–foot skin reaction (HFSR) by 22.3% compared to placebo.
- The treatment delayed the onset of HFSR and reduced its duration, particularly for severe cases.
- Progression-free survival was significantly longer in patients receiving TDX105.

## Abstract

Hand–foot skin reaction (HFSR) is the most common side effect of the antineoplastic drug Regorafenib. It severely affects patients’ quality of life, and no clear treatment is currently available for the condition. In preliminary clinical studies, the traditional Chinese medicine compound Danxiong Granules (TDX105) has shown significant therapeutic benefit for HFSR. This study aimed to evaluate the prophylactic effect of TDX105 for HFSR.

A total of 137 colorectal cancer patients scheduled for Regorafenib treatment were randomly assigned in a 2:1 ratio to a treatment group (n = 91) and a control group (n = 46), which received basic treatment (topical urea ointment) plus TDX105 or placebo, respectively, for 8 weeks. Follow-up was conducted until tumor regression or Regorafenib discontinuation. The primary study endpoint was the incidence of HFSR within 8 weeks.

The total incidence of HFSR was markedly lower in the treatment group than in the control group (76.1% vs. 53.8%), particularly for grade 3 HFSR (7.7% vs. 19.6%, p = 0.041; absolute risk difference: 11.87%, 95% confidence interval: −0.01–0.25). Moreover, TDX105 significantly delayed the median onset time of HFSR (25 vs. 11 days, p < 0.001) and decreased the durations of grades 2 and 3 HFSR (grade 2: 12 vs. 22 days; grade 3: 5 vs. 13 days, p < 0.01). The rate of Regorafenib dose reduction due to HFSR was significantly lower in the treatment group (1.10% vs. 19.57%, p < 0.05). Importantly, the HFSR continuation rate was 0% in the treatment group, compared to 10.87% in the control group. Although tumor control rates were similar in both groups, progression-free survival was significantly improved in the treatment group (3.2 vs. 2.5 months, p = 0.048).

TDX105 significantly reduced the incidence and severity of Regorafenib-induced HFSR. This finding lends support to the use of TDX105 for prevention of HFSR.

NCT05289726.