RomidepsinOther Names: FK228, Istodax, RMD Drug Class: Latency-Reversing Agents Molecular Formula: C24 H36 N4 O6 S2 Registry Number: 128517-07-7 (CAS) Chemical Name: (1S,4S,7Z,10S,16E,21R)-7-Ethylidene-4,21-bis(1-methylethyl)-2-oxa-12,13-dithia-5,8,20,23-tetraazabicyclo(8.7.6)tricos-16-ene-3,6,9,19,22-pentone Chemical Class: Cyclic tetrapeptide Organization: Celgene Corporation Phase of Development: Romidepsin is in Phase 2 development as a latency-reversing agent for HIV treatment.
(Compound details obtained from ChemIDplus Advanced,1 Treatment Action Group website,2 Celgene Corporation website,3 and Journal of Biomedicine and Biotechnology article4)
What is romidepsin?
Romidepsin (brand name: Istodax) is a drug that has been approved by the U.S.for the treatment of certain types of cancer.5 It is also being studied as an as part of a strategy to cure HIV .6–10 As an HIV investigational drug, romidepsin belongs to a group of drugs called .2
How do latency-reversing agents work?
Currently, there is no cure for HIV infection. One of the main obstacles to curing HIV infection is that thecan remain hidden and inactive (latent) inside certain cells of the (such as resting CD4 cells) for many months or even years. The cells where latent HIV hides are known as the . Because HIV in this latent state is inactive, the immune system cannot detect the virus, and the (ARV) drugs that are used to treat HIV have no effect on it.11–13
Latency-reversing agents work by drawing HIV out of its latent state within resting CD4 cells. Once the latent HIV is reactivated, the CD4 cells that harbor the virus are more likely to be recognized and killed by the body’s immune system or may be killed by certain HIV therapies, such as those that can enhance the body’s What is a Latent HIV Reservoir? fact sheet.to HIV. Researchers hope that the combined use of romidepsin and other HIV-fighting strategies, including ongoing (ART), may fully eliminate HIV from the body.11–13 To learn more, see the AIDSinfo
Which clinical trials are studying romidepsin?
Study Names: REDUC; NCT02092116
Status: This study has been completed.
Purpose: The REDUC trial was a two-part study. Part A was designed to find a safe and effective of romidepsin to use in the second part of the study. Part B was designed to evaluate the effect of the investigational therapeutic Vacc-4x when combined with romidepsin on the amount of latent HIV in the body and levels during a planned break from ART.6
Study Names: ACTG 5315; NCT01933594
Status: This study has been completed.
Location: United States
Purpose: The purpose of this study was to look at the safety of single and multiple doses of romidepsin and to determine the effectiveness of these different doses in reactivating latent HIV within resting CD4 T cells.7
Study Names: HIVACAR; NCT03619278
Status: See the record for this study's status.
Location: Not available
Purpose: The purpose of this study is to evaluate the safety and effectiveness of different therapeutic HIV vaccines (HIVARNA01.3 with and without MVA-vectored vaccine boosts or HIVACAR01), each in combination with the broadly neutralizing (bNAb) 10-1074 and romidepsin. Researchers will assess whether these combinations can control participants’ viral load levels during a planned break from ART.14
Study Names: ROADMAP; NCT02850016
Status: This study is ongoing, but not recruiting participants.
Locations: Denmark, Germany, United States
Purpose: The purpose of this study is to compare the effectiveness of romidepsin plus the investigational drug 3BNC117 to the effectiveness of romidepsin administered alone in controlling viral load during a treatment interruption.9
Study Names: BIOSKILL; EudraCT 2015-003186-28
Status: This study has been completed.
Locations: Australia, Europe, United States
Purpose: The purpose of this study was to evaluate the safety and effectiveness of the combined use of Vacc-4x and romidepsin. The researchers measured the effects of Vacc-4x and romidepsin on viral load, latent HIV, and the body’s immune responses.10
Study Names: eCLEAR; NCT03041012
Status: This study is currently recruiting participants.
Purpose: The purpose of this study is to evaluate the effect of romidepsin, 3BNC117, or both on the latent HIV reservoir size when given soon after ART is started in adults who have never previously taken ART.15
For more details on the studies listed above, see the Health Professional version of this drug summary.
Another study, the BCN02-Romi trial (NCT02616874), is a that has been completed. This study evaluated the use of an investigational therapeutic vaccine called MVA.HIVconsv in combination with romidepsin in participants who already received investigational therapeutic vaccines during a separate trial.8
What side effects might romidepsin cause?
One goal of HIV research is to identify new drugs that have fewer side effects. The following side effects were observed in some of the studies of romidepsin listed above.REDUC (NCT02092116):
In Part A of the REDUC trial, all romidepsin-related side effects were mild in severity and resolved within a few days. The most common side effects related to romidepsin were abdominal symptoms (such as nausea, stomach growling, and abdominal pain) and fatigue. Some mild changes incounts and T cell counts were seen.16
In Part B of the REDUC trial, the majority of side effects were mild in severity. Side effects associated with romidepsin included fatigue and nausea. One side effect associated with romidepsin—mild hair loss—did not resolve by the end of the study. Side effects related to Vacc-4x plus theACTG 5315 ( and to the treatment interruption also occurred.17NCT01933594):
Participants who received single doses of romidepsin tolerated the drug well and had no treatment-related serious side effects.7,18
Among 16 total participants enrolled to receive multiple-dose romidepsin or, no life-threatening side effects were reported. One participant experienced severe that was possibly related to treatment. Four participants experienced moderate side effects that were possibly or probably related to treatment; these included blurred vision, neutropenia, nausea, and headache.7,19
Because romidepsin is still being studied, information on possible side effects of the drug is not complete. As testing of romidepsin continues, additional information on possible side effects will be gathered.
Additional information on side effects known to be associated with romidepsin can be found in the FDA-approved Full Prescribing Information for Istodax.5
Where can I get more information about clinical trials studying romidepsin?
More information about romidepsin-related research studies is available from the AIDSinfo database of ClinicalTrials.gov study summaries. Click on the title of any trial in the list to see the ClinicalTrials.gov trial summary and more information about the study.
Some clinical trials may be looking for volunteer participants. Your health care provider can help you decide whether participating in a NIH Clinical Research Trials and You.is right for you. For more information, visit
- United States National Library of Medicine. ChemIDplus Advanced: Romidepsin. https://chem.nlm.nih.gov/chemidplus/rn/128517-07-7. Accessed December 17, 2019.
- Treatment Action Group website. Research toward a cure trials. http://www.treatmentactiongroup.org/cure/trials. Accessed December 17, 2019.
- Celgene Corporation website. Therapies. https://www.celgene.com/therapies/. Accessed December 17, 2019.
- Masetti R, Serravalle S, Biagi C, Pession A. The role of HDACs inhibitors in childhood and adolescence acute leukemias. J Biomed Biotechnol. Article ID 148046 2011. doi:10.1155/2011/148046
- Celgene Corporation. Istodax: full prescribing information, August 2016. DailyMed. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=03b39d40-90fe-11df-9de6-0002a5d5c51b. Accessed December 17, 2019.
- Bionor Immuno AS. An open Phase I/IIa study to evaluate the safety and effect of therapeutic HIV-1 immunization using Vacc-4x + rhuGM-CSF, and HIV-1 reactivation using romidepsin, on the viral reservoir in virologically suppressed HIV-1 infected adults on cART. In: ClinicalTrials.gov. Bethesda (MD): National Library of Medicine (US). Registered on March 3, 2014. NLM Identifier: NCT02092116. https://clinicaltrials.gov/ct2/show/NCT02092116. Accessed December 17, 2019.
- National Institute of Allergy and Infectious Diseases (NIAID). A Phase I/II study of romidepsin in HIV-infected adults with suppressed viremia on antiretroviral therapy to assess safety, tolerability, and activation of HIV-1 expression. In: ClinicalTrials.gov. Bethesda (MD): National Library of Medicine (US). Registered on August 28, 2013. NLM Identifier: NCT01933594. https://clinicaltrials.gov/ct2/show/NCT01933594. Accessed December 17, 2019.
- IrsiCaixa. An open label Phase I trial to evaluate the safety and effect of HIVconsv vaccines in combination with histone deacetylase inhibitor romidepsin on the viral rebound kinetic after treatment interruption in early treated HIV-1 infected individuals (BCN02-Romi). In: ClinicalTrials.gov. Bethesda (MD): National Library of Medicine (US). Registered November 9, 2015. NLM Identifier: NCT02616874. https://clinicaltrials.gov/ct2/show/NCT02616874. Accessed December 17, 2019.
- Rockefeller University. A Phase 2a, randomized study of romidepsin with or without 3BNC117 to evaluate the effects on the HIV-1 reservoir (ROADMAP). In: ClinicalTrials.gov. Bethesda (MD): National Library of Medicine (US). Registered on July 26, 2016. NLM Identifier: NCT02850016. https://clinicaltrials.gov/ct2/show/NCT02850016. Accessed December 17, 2019.
- EU Clinical Trials Register. EudraCT Number: 2015-003186-28; BIOSKILL: studying Vacc-4x, an HIV therapeutic vaccine, an assessment of immune-mediated anti-viral effects, when administered with adjuvant GM-CSF prior to HIV latent reservoir activation by the HDAC inhibitor, romidepsin. https://www.clinicaltrialsregister.eu/ctr-search/trial/2015-003186-28/DK#E. Accessed December 17, 2019.
- Siliciano RF, Greene WC. HIV latency. Cold Spring Harb Perspect Med. 2011;1(1):a007096.
- Rasmussen TA, Tolstrup M, Winckelmann A, Østergaard L, Søgaard OS. Eliminating the latent HIV reservoir by reactivation strategies. Hum Vaccines Immunother. 2013;9(4):790–799.
- National Institute of Allergy and Infectious Diseases (NIAID). HIV viral eradication. https://www.niaid.nih.gov/diseases-conditions/hiv-viral-eradication. Accessed December 17, 2019.
- David Garcia Cinca. A Phase I/IIa, randomised study to evaluate the safety and the effectiveness of a combination of therapeutic vaccine, broadly neutralising antibody (10-1074), and the latency reversing agent romidepsin to achieve a remission of HIV infection in chronically HIV-infected participants under stable combined antiretroviral therapy. In: ClinicalTrials.gov. Bethesda (MD): National Library of Medicine (US). Registered on March 14, 2018. NLM Identifier: NCT03619278. https://clinicaltrials.gov/ct2/show/NCT03619278. Accessed December 17, 2019.
- Aarhus University Hospital. Early administration of latency reversing therapy and broadly neutralizing antibodies to limit the establishment of the HIV-1 reservoir during initiation of antiretroviral treatment - a randomized controlled trial. In: ClinicalTrials.gov. Bethesda (MD): National Library of Medicine (US). Registered on January 20, 2017. NLM Identifier: NCT03041012. https://clinicaltrials.gov/ct2/show/NCT03041012. Accessed December 17, 2019.
- Søgaard OS, Graversen ME, Leth S, et al. The depsipeptide romidepsin reverses HIV-1 latency in vivo. PLoS Pathog. 2015;11(9). doi:10.1371/journal.ppat.1005142
- Leth S, Schleimann MH, Nissen SK, et al. Combined effect of Vacc-4x, recombinant human granulocyte macrophage colony-stimulating factor vaccination, and romidepsin on the HIV-1 reservoir (REDUC): a single-arm, phase 1B/2A trial. Lancet HIV. 2016;3(10):e463-e472. doi:10.1016/S2352-3018(16)30055-8
- McMahon D, Zheng L, Cyktor JC, et al. Single romidepsin infusions do not increase HIV expression in persons on ART (A5315). Abstract presented at: Conference on Retroviruses and Opportunistic Infections (CROI); March 4–7, 2018; Boston, MA. Abstract 72. http://www.croiconference.org/sessions/single-romidepsin-infusions-do-not-increase-hiv-expression-persons-art-a5315. Accessed December 17, 2019.
- McMahon D. Effect of multidose romidepsin on HIV-1 expression in persons on ART: ACTG A5315. Webcast presented at: Conference on Retroviruses and Opportunistic Infections (CROI); March 4-7, 2019; Seattle, WA. http://www.croiwebcasts.org/console/player/41062?mediaType=slideVideo&&crd_fl=0&ssmsrq=1574118674788&ctms=5000&csmsrq=5074. Accessed December 17, 2019.
Last Reviewed: December 17, 2019
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