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Zalcitabine Clinical Trials

A Prospective, Randomized, Open-Label, Comparative Trial of Dideoxyinosine (ddI) Versus Dideoxycytidine (ddC) in HIV-Infected Patients Who Are Intolerant of or Who Have Failed Zidovudine (AZT) Therapy
To evaluate and compare the effectiveness and toxicity associated with didanosine ( ddI ) and zalcitabine ( dideoxycytidine; ddC ) in patients with HIV infection who are intolerant of or have failed zidovudine ( AZT ) therapy. Alternative and [more...]  less toxic treatments need to be investigated for the treatment of HIV infection. Studies have shown that the dideoxynucleosides ddI and ddC may be effective antiretroviral agents in the treatment of HIV-infected individuals. However, ddI and ddC have yet to be compared on the basis of patient survival, drug tolerance, immunologic and virologic effectiveness, and the incidence of opportunistic infection or opportunistic malignancy. Results of this study will yield information regarding the relative therapeutic benefits and toxicities of each drug while providing alternative treatment to patients who are unable to tolerate or have had progression of disease while on AZT.
Status: Completed Start Date:  Completion Date: September 1992
A Study of Dideoxycytidine Plus Zidovudine in the Treatment of AIDS or Advanced AIDS Related Complex (ARC)
To determine the safety, tolerability, and activity of zidovudine (AZT) and zalcitabine (dideoxycytidine; ddC) and the bloodstream levels of these drugs in patients with AIDS or advanced AIDS-related complex (ARC). Treatments using [more...]  AZT alternating with ddC are being evaluated in ongoing trials with a goal of reducing the toxicity of each while maintaining antiviral effects. In addition, AZT and ddC may work together in a way that both drugs can be taken at lower doses or less frequent intervals when given together. If the doses can be reduced, then toxicity associated with long-term use of one drug may be reduced. Combination of AZT and ddC might reduce the likelihood of the emergence of resistant mutants. Recent studies indicate a reduced sensitivity of HIV isolated from patients after prolonged AZT therapy. Although the clinical significance of this finding is not clear, it would indicate that these combination studies are all the more important. HIV strains with decreased sensitivity to AZT are still sensitive to ddC.
Status: Completed Start Date:  Completion Date: 
Dideoxycytidine ( Ro 24-2027 ) A Randomized, Open-Label, Comparative Study of Dideoxycytidine ( ddC ) Versus Zidovudine ( AZT ) in Patients With AIDS or Advanced ARC Who Have Received Long-Term AZT Therapy.
To compare the effectiveness of zalcitabine ( dideoxycytidine; ddC ) therapy to zidovudine ( AZT ) in the treatment of AIDS or advanced AIDS related complex ( ARC ) in patients who have already received at least 1 year of AZT therapy and to [more...]  define the safety profile. ddC has been shown to have an antiviral effect, and AZT is known to significantly decrease mortality and to reduce the frequency of opportunistic infections in patients with AIDS or advanced ARC. After 1 year of AZT therapy, the effectiveness tends to diminish and patients progress with more opportunistic infections and higher mortality rates. This may be due to the emergence of AZT resistant virus isolated from some patients who have been on long-term AZT therapy. These isolates were still sensitive to ddC. A study of long-term effectiveness of ddC in patients with AIDS or advanced ARC who have been on long-term AZT therapy is warranted because (1) ddC has antiviral activity, (2) there is no blood toxicity associated with taking ddC, and (3) the effectiveness of ddC in test tube studies does not seem to be diminished by decreased effectiveness of AZT.
Status: Completed Start Date:  Completion Date: 
(Ro 24-2027) A Randomized, Double-Blind, Comparative Study of Dideoxycytidine (ddC) Versus Zidovudine (AZT) in Patients With AIDS or Advanced ARC
To show that zalcitabine (dideoxycytidine; ddC) is at least as effective as zidovudine (AZT) in the treatment of AIDS or advanced AIDS related complex (ARC), and also that ddC shows a different safety profile than AZT. In clinical studies, [more...]  ddC shows antiviral activity. Because of the antiviral activity, and because of the low incidence of mild, reversible neurotoxicity and absence of blood-related toxicity with low dose ddC therapy, a long-term Phase II/III study comparing ddC to AZT in patients with AIDS or advanced ARC is now warranted.
Status: Completed Start Date:  Completion Date: 
A Study of ddC in Patients With AIDS or Advanced AIDS-Related Complex (ARC) Who Have Not Had Success With Zidovudine (AZT)
AMENDED: To provide ddC for patients with AIDS or advanced ARC who have failed treatment with, are intolerant to or are ineligible to receive zidovudine (AZT) and to demonstrate that ddC monotherapy is safe, and tolerable in this patient population. [more...]  Original design: To provide zalcitabine (dideoxycytidine; ddC) for patients with AIDS or advanced AIDS-related complex (ARC) who have failed treatment with or are intolerant to zidovudine (AZT) and who are also intolerant to dideoxyinosine (ddI); to demonstrate that ddC monotherapy is safe and tolerable in the treatment of patients who previously experienced either treatment failure, hematologic intolerance or myositis with AZT treatment and pancreatitis or other toxicities (except peripheral neuropathy with ddI).
Status: Completed Start Date:  Completion Date: 
A Randomized, Double-Blind, Four-Arm Study Comparing Combination Nucleoside, Alternating Nucleoside, and Triple-Drug Therapy for the Treatment of Advanced HIV Disease (CD4 <= 50/mm3)
To determine the relative clinical efficacy of zidovudine ( AZT ) plus didanosine (ddI), AZT plus zalcitabine ( ddC ), AZT alternating monthly with ddI, and AZT/ddI plus nevirapine in HIV-infected patients with advanced disease. The rapid emergence of [more...]  resistant HIV strains has been observed in patients receiving monotherapy with a nucleoside analog or non-nucleoside reverse transcriptase inhibitor. Use of combination therapy with two nucleoside drugs or convergent combination therapy with two nucleosides and a non-nucleoside RT inhibitor may minimize the evolution of these resistant HIV strains. Since toxicity is a major problem in patients with advanced disease who are receiving combination nucleoside therapy, alternating the two drugs may provide a way of retaining several benefits of combination therapy while minimizing the increased toxicity.
Status: Completed Start Date:  Completion Date: September 1996
Open-Label Program of Dideoxycytidine ( ddC ) to Be Used in Combination With Zidovudine ( AZT ) for Treatment of Advanced HIV Disease
To provide zalcitabine ( dideoxycytidine; ddC ) for use with zidovudine ( AZT ) in patients with advanced HIV infection. To observe serious toxicities in this population.
Status: Completed Start Date:  Completion Date: 
A Randomized, Unblinded Trial of Zidovudine Versus ddC in the Treatment of Patients Status Post PCP Who Received Long-Term Zidovudine Therapy in Protocol ACTG 002
To evaluate the efficacy of AZT versus ddC in terms of survival, antiviral effects, neurological status, and health status in patients post Pneumocystis carinii pneumonia (PCP) who received long-term AZT therapy in ACTG protocol 002 While treatment with AZT has been [more...]  found to be effective in prolonging survival and reducing the numbers of opportunistic infections in patients with AIDS, during the second year of administration of AZT an acceleration in mortality has been observed. The reasons for this are not known at this time. The study of what may be an AZT-resistant strain of HIV may benefit patients who have been and are still receiving AZT or another drug used in treating HIV ddC. It is hoped that the comparison of the effectiveness of AZT and ddC will benefit in the treatment of these patients.
Status: Completed Start Date:  Completion Date: September 1992
A Randomized Trial to Evaluate the Safety and Efficacy of Combination Therapy With Retrovir ( AZT ) and HIVID ( ddC ) Versus Retrovir, HIVID, and Wellferon ( Interferon Alfa-n1 ) for the Treatment of HIV Infection
Primary: To determine whether the combination of zidovudine/zalcitabine/interferon alfa-n1 (Retrovir/HIVID/Wellferon) can produce complete responses (i.e., CD4 counts return to >= 800 cells/mm3 for more than 24 weeks) in patients with virus sensitive to all three agents. To determine the [more...]  antiviral effect of the combination therapies as evidenced by measures of quantitative viral load performed at select study centers only. Secondary: To determine the effectiveness of Retrovir/HIVID and Retrovir/HIVID/Wellferon in maintaining or increasing CD4 counts and preventing disease progression as evidenced by the development of an AIDS-defining indicator disease. To determine the effect of these regimens on secondary measures of clinical status (e.g., performance score, weight change, and secondary infections) and on measures of virologic activity such as serum p24 antigen. To assess the safety and tolerance of these regimens.
Status: Completed Start Date:  Completion Date: 
Double-Blind Study of Timunox (Thymopentin) in Asymptomatic HIV-Infected Patients Receiving Either Mono (AZT or ddI) or Combination (AZT / ddI or AZT / ddC) Anti-Retroviral Therapy
To confirm results from a previous study in which the combination of thymopentin plus zidovudine ( AZT ), an antiretroviral agent, slowed disease progression in HIV-infected asymptomatic patients. To evaluate the efficacy and safety of thymopentin in HIV-infected asymptomatic [more...]  patients receiving either monotherapy with AZT, didanosine ( ddI ), or stavudine ( d4T ), or combination antiretroviral therapy with AZT / ddI or AZT / zalcitabine ( ddC ).
Status: Completed Start Date:  Completion Date: 
The Antiviral Efficacy of Concurrent Zidovudine and 2',3'-Dideoxyinosine or 2',3'-Dideoxycytidine in Patients With Human Immunodeficiency Virus Disease
To evaluate the virologic effect of combined administration of zidovudine and ddI or ddC. To evaluate the immunologic effects of zidovudine and ddI or ddC. To evaluate combined administration of zidovudine and ddI or ddC for clinical efficacy. To evaluate the safety [more...]  and the tolerance of the coadministration of zidovudine and ddI or ddC.
Status: Completed Start Date:  Completion Date: 
A Randomized, Open-Label Study of Alternative Treatment Combinations of Dideoxycytidine (HIVID; ddC) and Zidovudine (AZT) in Patients With HIV Infection
To investigate the appropriate zalcitabine ( dideoxycytidine; ddC ) dose and zidovudine ( AZT ) schedule for use in combination therapy in patients with HIV infection.
Status: Completed Start Date:  Completion Date: 
A Study on the Management of Combination Anti-HIV Drug Therapy in HIV-Positive Children With Prior Treatment
The purpose of this study is to determine the value of changing anti-HIV medications in children with progressive HIV disease who have received previous treatment. Plasma viral load (the level of HIV in the blood) is probably most effectively reduced by [more...]  giving patients anti-HIV drugs which affect the virus at various stages of development. Changing the medications may enhance the results of treatment.
Status: Completed Start Date:  Completion Date: April 2002
A Comparison of Three Treatments for Advanced HIV Disease in Patients Who Have Received Nucleoside Therapy in the Past
To compare the efficacy, safety and tolerance, and other clinical and immunologic effects of zidovudine (AZT) plus zalcitabine (dideoxycytidine; ddC), AZT plus didanosine (ddI), and AZT alternating monthly with ddI as measured by differences in survival among HIV-infected persons [more...]  who have received 6 or more months of nucleoside monotherapy and have a CD4 count greater than or equal to 50 cells/mm3. Combining two nucleoside drugs has the theoretical advantage of optimal protection against the evolution of resistant strains of HIV. However, one major problem with combination nucleoside therapy in patients with advanced disease is the increased toxicity resulting from such therapy. One approach to minimize toxicity while perhaps retaining some of the benefits of combination therapy is to alternate the two drugs.
Status: Completed Start Date:  Completion Date: May 1993
A Study of Dideoxycytidine Plus Zidovudine (AZT) in HIV-Infected Children Who Have Taken AZT
PRIMARY: To determine safety, tolerance, and pharmacokinetics of zidovudine (AZT) and zalcitabine (dideoxycytidine; ddC) when given in combination in clinically stable AZT-treated children. SECONDARY: To compare combination therapy with mono drug therapy for antiviral activity and [more...]  laboratory markers of disease progression, as determined by virologic and immunologic determinations. To evaluate the influence of combination therapy on disease progression as determined by evaluation of clinical criteria. In children currently being treated with AZT, it is unknown whether the addition of another antiretroviral agent such as ddC would help increase efficacy and tolerance. This study will examine the possible advantages of combination AZT/ddC therapy over monotherapy with AZT alone.
Status: Completed Start Date:  Completion Date: April 1995
A Study of Saquinavir and Zalcitabine, Used Alone and Together, in the Treatment of Advanced HIV Infection in Patients Who Stopped Taking or Who Cannot Take Zidovudine
To compare the safety, tolerance, and efficacy of saquinavir mesylate (Ro 31-8959) alone, zalcitabine (dideoxycytidine; ddC) alone, and both in combination, in patients discontinuing or unable to take zidovudine (AZT).
Status: Completed Start Date:  Completion Date: 
A Study of Zidovudine (AZT) Used Alone or in Combination With Other Anti-HIV Drugs in HIV-Infected Patients With Little or No Previous Treatment
To compare, in zidovudine (AZT)-naive patients, the safety, tolerance, and efficacy of saquinavir mesylate (Ro 31-8959) alone versus AZT alone versus AZT in combination with Ro 31-8959, zalcitabine (ddC), or both. To compare various disease markers among the different [more...]  regimens.
Status: Completed Start Date:  Completion Date: 
The Safety and Effectiveness of a Two-Drug Combination in the Treatment of Patients With Hepatitis C Plus Advanced HIV Infections
To investigate the toxicity of interferon alfa-2b ( IFN alfa-2b ) in combination with nucleoside analog therapy in HIV-positive patients with chronic hepatitis C. To determine the efficacy of treatment with IFN alfa-2b for chronic hepatitis C in patients with advanced [more...]  HIV infections treated with nucleoside analog therapy. IFN alfa-2b has HIV inhibitory properties and has also been approved for treatment of chronic hepatitis C. Studies have shown that IFN alfa-2b is effective in asymptomatic HIV-positive patients with chronic hepatitis C, but the drug's benefit against hepatitis C in patients with advanced HIV infection has not been determined.
Status: Completed Start Date:  Completion Date: September 1996
The Safety and Effectiveness of Three Anti-HIV Drug Combinations in HIV-Infected Patients Who Have Taken AZT
To evaluate the safety and efficacy of low and high doses of lamivudine ( 3TC ) in combination with zidovudine ( AZT ) and zalcitabine ( dideoxycytidine; ddC ) in combination with AZT. PER 02/27/95 AMENDMENT: To evaluate the [more...]  efficacy and safety of both blinded and open-label combination therapy.
Status: Completed Start Date:  Completion Date: 
Comparison of Ro 31-8959 Plus Zidovudine (AZT) Versus AZT Plus Zalcitabine (ddC) Versus Ro 31-8959 Plus AZT Plus ddC
PRIMARY: To determine the efficacy and toxicity of three treatment regimens: saquinavir mesylate (Ro 31-8959) plus zidovudine (AZT) vs. AZT plus zalcitabine (dideoxycytidine; ddC) vs. Ro 31-8959 plus AZT plus ddC. SECONDARY: To investigate the pharmacokinetics and effects on [more...]  various clinical parameters of the three regimens.
Status: Completed Start Date:  Completion Date: 
A Multicenter Dose Ranging Clinical Trial of 2',3'-Dideoxycytidine in the Treatment of Patients With AIDS and Advanced ARC.
To evaluate the long-term safety and effectiveness of the drug 2',3'-dideoxycytidine ( zalcitabine; ddC ) in treating patients with AIDS or advanced AIDS related complex ( ARC ). Recent studies show that a certain group of drugs (dideoxynucleosides) are effective in [more...]  treating patients with HIV infection. ddC is a dideoxynucleoside and test tube studies show that it may be valuable in treating AIDS patients. ddC has been shown to be well tolerated in certain patients with AIDS.
Status: Completed Start Date:  Completion Date: April 1990
The Safety and Effectiveness of Retrovir Plus HIVID Combined With Either Nevirapine or Invirase in the Treatment of HIV Infection
To evaluate the tolerance and immunologic and virologic effects of multidrug combinations of antiretrovirals in patients with HIV infection. Specifically, to evaluate zidovudine/zalcitabine ( AZT / ddC ) alone or in combination with either nevirapine or saquinavir ( Ro [more...]  31-8959 ). Administration of three-drug combinations for treatment of HIV infection is preferred over monotherapy or duotherapy. A system has been designed to rapidly evaluate current multidrug combinations of antiretrovirals and allow the addition of new agents as they become available.
Status: Completed Start Date:  Completion Date: 
Comparison of Anti HIV Drugs Used Alone or in Combination With Cytosine Arabinoside to Treat Progressive Multifocal Leukoencephalopathy (PML) in HIV-Infected Patients
To compare the safety and efficacy of antiretroviral therapy (zidovudine plus either didanosine or dideoxycytidine) versus antiretroviral therapy plus intravenous cytarabine (Ara-C) versus antiretroviral therapy plus intrathecal Ara-C in the maintenance or improvement of neurological function over 6 months [more...]  in HIV-infected individuals who have developed progressive multifocal leukoencephalopathy (PML). To compare the effect of these three treatment regimens on Karnofsky score and MRI studies. The effectiveness of Ara-C in the treatment of PML, caused by a human DNA papovavirus (designated JC virus) infection, has not been determined, although the most encouraging results have occurred with intrathecal administration of the drug.
Status: Completed Start Date:  Completion Date: April 1997
A Randomized, Double Blind, Comparative Study of Dideoxycytidine (ddC) Alone or ddC/AZT Combination Versus Zidovudine (ZDV) Alone in Patients With HIV Infection Who Have Received Prior ZDV Therapy
To evaluate the safety of zalcitabine (dideoxycytidine; ddC) alone and in combination with zidovudine (AZT) versus AZT alone when administered to asymptomatic patients with a CD4 count = or < 200 cells/mm3 and symptomatic patients with a CD4 count = or < 300 cells/mm3. [more...]  To compare the effectiveness of ddC alone and in combination with AZT versus AZT alone. ddC has been shown to demonstrate an antiviral effect. AZT has been shown to significantly decrease mortality and reduce the frequency of opportunistic infections in patients with AIDS or advanced ARC. After 1 year of AZT therapy, the effectiveness tends to diminish and patients progress with more opportunistic infections and higher mortality rates. Because of the demonstrated antiviral activity, absence of hematologic toxicity, and lack of cross tolerance in laboratory studies of ddC, a study to investigate the long-term effectiveness of ddC in patients with HIV infection who have received AZT therapy is warranted.
Status: Completed Start Date:  Completion Date: May 1993
An Open-Label, Multicenter Study to Evaluate the Safety and Tolerability of Dideoxycytidine (ddC) in Patients With AIDS or Advanced ARC Who Previously Demonstrated Intolerance to Zidovudine (AZT) in Protocol N3300 or N3492
To demonstrate that zalcitabine (dideoxycytidine; ddC) monotherapy is safe and tolerable in the treatment of patients with AIDS or advanced AIDS related complex (ARC) who previously demonstrated intolerance to zidovudine (AZT) treatment while in Protocol N3300 (NIAID ACTG 114) [more...]  or N3492 (NIAID ACTG 119). NOTE OF CAUTION FOR CONCOMITANT MEDICATIONS ON STUDY: Patients on amphotericin, pyrimethamine, sulfadiazine, trimethoprim/sulfamethoxazole, ganciclovir, intravenous pentamidine, intravenous acyclovir or oral acyclovir or other bone marrow or renal toxic drugs may not tolerate concomitant ddC. If these drugs are given concomitantly with ddC, patients should have frequent clinical and laboratory assessments, as appropriate. Drugs that are nephrotoxic or have the potential to cause peripheral neuropathy might be expected to cause increased toxicity when co-administered with ddC. Drugs that could cause serious additive toxicity when co-administered with study medication will be allowed for treatment of an acute intercurrent illness or opportunistic infection at the discretion of the investigator. Their use may be allowed with interruption of study drug for up to 35 days per episode, for a total of 90 days for the study. If the patient's condition requires chronic administration of these medications, the patient will be discontinued from study medication and followed.
Status: Completed Start Date:  Completion Date: 
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Clinical trials allow volunteers access to medical treatment options before they are available to the general public. Participants often receive the best healthcare available for their condition.

Risks are a reality, however, and may include more frequent doctor visits, health risks (possibly life-threatening), and/or the treatment being ineffective. Trials are federally regulated with strict guidelines to protect participants.

Zalcitabine Clinical Trials Information presented on ClinicalTrialsSearch.org is not intended to be a substitute for qualified medical advice visit or treatment with a real physician. We are not physicians. Always consult with a medical doctor (MD). ClinicalTrialsSearch.org is a website dedicated to listing clinical research studies in human subjects, including those specifically related to Zalcitabine. Clinical research trials and medical trials take place in hundreds of cities across the United States. A clinical trial or clinical study is a research project with human volunteer subjects. Clinical drug trials and pharmaceutical clinical trials generally measure the effectiveness of new treatments and drugs. The purpose of the studies is to answer specific human health questions. Clinical trials are a popular way for doctors, government agencies, and private sector companies to find treatments for all kinds of conditions. Clinical trials allow volunteers access to medical treatment options before they are available to the general public. Many times the participants receive treatment for free, and sometimes they are paid for their time. Participants often receive the best healthcare available possible for their condition. Risks are a reality, however, and may include more frequent doctor visits, health risks (possibly life-threatening), and/or the treatment being ineffective. U.S. - based Zalcitabine studies are federally regulated with strict guidelines to protect patients.

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