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HDAC inhibitors show 0.65 pooled favorable response rate in advanced head and neck cancerHDAC Inhibitors Show Promise for Advanced Head and Neck Cancer

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Key Takeaway
Note that HDAC inhibitors show a 0.65 pooled favorable response rate in advanced head and neck cancer.

This meta-analysis synthesized data from 7 single-arm clinical trials involving 101 patients with advanced head and neck cancer (HNC) treated with various histone deacetylase inhibitors (HDACi), including vorinostat, valproic acid, panobinostat, and romidepsin.

The primary finding was a pooled cumulative proportion of favorable response to HDACi therapy based on RECIST criteria of 0.65 (74 out of 101 patients). The analysis also reported an average proportion of antitumor response of 0.758 when HDACi was used with concurrent chemotherapy, chemoradiotherapy, or targeted therapy. In contrast, the average proportion of antitumor response for previously treated HNC patients was 0.485. Specific results for vorinostat showed a favorable response of 0.49, while non-vorinostat HDACi showed a response of 0.77.

Clinical utility is suggested by the 0.65 response rate, particularly in combination settings. However, the evidence is limited by the use of single-arm trials and the lack of reported safety data or specific follow-up durations. The results should be interpreted with caution due to the observational nature of the pooled data from small, non-randomized studies.

How this fits prior evidence

This meta-analysis addresses a gap in the current evidence regarding the efficacy of histone deacetylase inhibitors in advanced head and neck cancer. While prior coverage has established quality of life metrics (0.79 EQ-5D utility scores) and identified risk factors such as high FDG-PET SUVmax, this study provides specific response rates for HDACi therapy. It confirms the potential of HDACi as a treatment component, though it does not directly relate to the previously noted risks of chronic rhinosinusitis or the outcomes of IMRT plus cetuximab.

Researchers analyzed data from several clinical trials involving 101 patients with advanced head and neck cancer. These patients were treated with a group of medications known as Histone Deacetylase Inhibitors (HDACi). This includes specific drugs like Vorinostat, valproic acid, panobinostat, and romidepsin.

The analysis found that about 65 percent of the patients showed a favorable response to the HDACi therapy. When these drugs were used alongside chemotherapy, chemoradiotherapy, or targeted therapy, the response rate was even higher, reaching about 76 percent. For patients who had already received prior treatments, the response rate was about 49 percent.

Because this study combined data from several small, single-arm trials, the results should be viewed with caution. There was no specific data provided regarding side effects or how well patients tolerated the drugs. These findings suggest that HDAC inhibitors could be a helpful addition to current treatments for advanced head and neck cancer, but more large-scale studies are needed to confirm these results.

What this means for you:
HDAC inhibitors showed a 65 percent response rate in advanced head and neck cancer patients in this review.

Common questions

Are these drugs effective for patients who have already received treatment?

For patients with head and neck cancer who had received prior treatments, the study reported an average antitumor response rate of about 49 percent. This is lower than the rate seen in patients receiving concurrent therapies.

Are there known side effects for these medications?

The provided data did not include specific information regarding side effects, serious adverse events, or how well patients tolerated the medications. You should speak with your doctor to discuss the specific risks and benefits of these treatments.

Study Details

Study typeMeta analysis
Sample sizen = 74
EvidenceLevel 1
PublishedOct 2026
View Original Abstract ↓
ObjectiveTo study the cumulative proportion of favorable response to Histone Deacetylase Inhibitor (HDACi) among head and neck cancer (HNC) patients.Data SourcesA systematic search (till 17-May-2025) was carried out in PubMed, Scopus, and Web of Science databases using "Head and Neck cancer" and "HDAC inhibitors" as key concept where all the single-arm clinical trials which have clear data on response to HDACi therapy-based RECIST criteria among HNC patients were included in this study. The meta-analysis was performed using R software.Data SummaryThe search resulted in a total of 178 articles, of which 7 studies were found to be relevant based on the inclusion criteria. Out of a total of 101 advanced HNC patients treated with HDACi in single-arm clinical trials, 74 patients showed favorable antitumor response. The pooled cumulative proportion of favorable response with the random effect model was found to be 0.65. Out of these 7 studies, the average proportion of antitumor response was calculated to be 0.758 among HNC patients who received HDACi concurrently with chemotherapy, chemoradiotherapy, and targeted therapy, whereas the average proportion of antitumor response rate to HDACi was 0.485 among priorly treated HNC patients. Vorinostat was the most used HDACi, where the proportion of favorable response was 0.49 compared to the non-vorinostat HDACi (0.77), like valproic acid, panobinostat, and romidepsin.ConclusionThe overall antitumor response to HDACi was found to be 0.65 (65%), which supports the use of HDACi among advanced HNC patients, particularly along with the concurrent chemo/chemoradiotherapy or targeted therapy.
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