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A Phase 2 Study of PTX 100 in Patients With Relapsed/Refractory CTCL

  • PhasePhase 2
  • StatusRecruiting
  • Planned enrollment115 people
  • Recruiting US sites5
  • SponsorPrescient Therapeutics, Ltd.
  • RegistryNCT06854653

Recruitment re-checked on ClinicalTrials.gov Oct 30, 2026. Public record; not medical advice.

A Phase 2 Study of PTX 100 in Patients With Relapsed/Refractory CTCL: a one-minute explainerNCT068546531 min

Eligibility

Who can join

The film gives the main points. The full list below is copied from the registry; the study team makes the final decision.

  • Age18 Years to no maximum
  • SexAll
  • Healthy volunteersNo

You may be able to join if

  • Adult patient ≥18 years of age at the time of signing the informed consent.
  • Patient is capable of giving adequate signed informed consent
  • Have a confirmed diagnosis of CTCL with histological confirmation
  • Patients must have greater than or equal to Stage Ib disease.
  • Has received and failed (or intolerant of) at least 2 prior lines of prior systemic therapy for their disease.
  • Has measurable disease defined by at least one of the following, within 28 days prior to start of study treatment: by evaluable by mSWAT or quantifiable by flow cytometry or morphology in blood or measurable by Lugano Criteria.
  • On a stable dose of systemic corticosteroid (< 10 mg prednisone or equivalent) are permitted. Participants on a stable dose of topical corticosteroids are permitted.
  • Washout period- must be 2 weeks (4 weeks for monoclonal antibodies) or 5 -half-lives (whichever is longer) since any prior anti-cancer therapy.
  • Must be human T-cell lymphotropic virus type 1 (HTLV1) negative.
  • Has an ECOG PS of 0 to 2.
  • Life expectancy of 3 months or greater
  • Has adequate bone marrow function.
  • Has adequate hepatic function.
  • Has adequate Renal function.
  • Has adequate coagulation function.
  • Patients with Human Immunodeficiency virus (HIV) must be on established and stable effective anti-retroviral therapy for at least 4 weeks and have an HIV viral load of less than 400 copies/mL.
  • Male patients are eligible to participate if they agree to use a highly effective contraception during the treatment period and for at least 3 months after the last dose of study treatment and refrain from donating sperm during this period.
  • Female patients are eligible to participate if they are not pregnant, not breastfeeding, and at least one of the following conditions applies:
  • Not a woman of childbearing potential (WOCBP).
  • OR
  • A WOCBP who agrees to use a contraceptive method that is highly effective (with a failure rate of < 1% per year) or be abstinent from heterosexual intercourse as their preferred method and usual lifestyle, beginning the time of informed consent, during the treatment period and for at least 3 months after the last dose of study treatment.
  • A WOCBP must have a negative serum pregnancy within 72 hours of the first dose of study treatment.
  • Must be willing and able to adhere to the study as judged by the Investigator.

You cannot join if

  • Patients with known central nervous system involvement.
  • Patients who require the use of strong inhibitors or inducers of CYP enzymes or transporters (e.g., CYP3A4, 2D6, 2C19) or (P-gp, BCRP, OATP1B1, OATP1B3, OAT1. OAT3, OCT2, MATE1 and MATE2-K). Patients who are receiving these medications at Screening can be enrolled into the trial if they discontinue them for at least 14 days or 5 half-lives, whichever is longer, before they commence PTX-100. An alternative pharmacological treatment should be instituted by the treating clinician based on clinical judgement.
  • Significant cardiovascular disease. A history of, or concurrent interstitial lung disease or severely impaired lung function.
  • Active viral, bacterial, fungal infection or other serious infection requiring ongoing systemic treatment. Routine antimicrobial prophylaxis is permitted.
  • Medical history of another malignant tumor within the past 5 years. Exceptions are patients with basal cell carcinoma of the skin, squamous cell carcinoma of the skin or carcinoma in situ who have undergone curative therapy with no evidence of disease.
  • On an immunomodulatory drug for concomitant or intercurrent conditions or who have received any of these agents within 4 weeks of baseline.
  • Patients with active viral (any etiology) hepatitis are excluded. However, patients with serologic evidence of chronic hepatitis B virus (HBV) infection (defined by a positive hepatitis B surface antigen test and a positive anti-hepatitis core antigen antibody test) who have a viral load below the limit quantification (HBV deoxyribose nucleic acid titer < 1000 cps/mL or 200 IU/mL) and are not currently on viral suppressive therapy may be eligible and should be discussed with the Medical Monitor. Patients with a history of hepatitis C virus infection who have completed curative antiviral treatment and have a viral load below the limit of quantification may be eligible and should be discussed with the Medical Monitor.
  • A history or current evidence of any condition, laboratory abnormality or other circumstance that might confound the results of the study or interfere with patient participation for the full duration of the study.
  • Prior allogeneic or autologous hematopoietic transplantation 11. Has a known psychiatric disorder that would interfere with compliance with the requirements of the study.
  • Is a consumer of illicit or recreational drugs or has a recent history (within the last year) of drug or alcohol abuse or dependence that in the judgment of the Investigator, would interfere with compliance with the requirements of the study.

The treatment

How it is intended to work

This is how the treatment is meant to work. Whether it helps, and how safe it is, is what this trial is testing.

geranylgeranyltransferase I inhibitor. A substance that inhibits protein geranylgeranyltransferase type 1 (GGTase-I), with potential antineoplastic activity. GGTase-I is involved in the posttranslational modification of a number of oncogenic GTPases, including K-Ras, N-Ras, RhoA, RhoC, Cdc42, RalA, RalB and Rac1. Inhibition of the prenylation of these oncogenic proteins inhibits both their oncogenic activity and membrane localization. This may result in cell cycle arrest and apoptosis. Protein geranylgeranylation, catayzed by GGTase-I, plays a critical role in malignant transformation and cancer cell proliferation, migration and invasion. NCI Drug Dictionary

Treatments listed in the registry

  • PTX-100 (Drug): Peptidomimetic inhibitor of GGTase 1

The study

Treatment groups

Randomized · Parallel · masking: None

Phase 2a PTX-100 500mg/m2 (Experimental)

Phase 2a PTX-100 will be 500mg/m2 IV infusion over 60 minutes on days 1 to 5 of a 14-day cycle for 4 cycles. This is then followed by IV infusion over 60 minutes on days 1 to 5 of a 21-day cycle for up to 18months.

Phase 2a PTX-100 1000mg/m2 (Experimental)

Phase 2a PTX-100 will be 1000mg/m2 IV infusion over 60 minutes on days 1 to 5 of a 14-day cycle for 4 cycles. This is then followed by IV infusion over 60 minutes on days 1 to 5 of a 21-day cycle for up to 18months.

Phase 2b PTX-100 Recommended Optimal Dose (ROD). (Experimental)

Phase 2b PTX-100 will be the Recommended Optimal Dose form Phase 2a and follow the same infusion timeline outlined previously. IV infusion of RD over 60 minutes on days 1 to 5 of a 14-day cycle for 4 cycles then followed by IV infusion of RD over 60 minutes on days 1 to 5 of a 21-day cycle up to 18months.

What it involves

Procedures

As the registry describes them. Requirements to join, such as a tissue sample, are in the eligibility list above even when on-study procedures are optional. Ask the study team which steps apply to you.

  • blood samples: Part of the study plan
  • questionnaires: Part of the study plan

Goals

What the study measures

Main goals

  • To determine the efficacy of PTX-100 as determined by ORR. (18 months from day of first treatment until disease progression, unacceptable toxicity, participant or Investigator decision.)

Other goals

  • To further characterize the efficacy of PTX-100
  • Progression-free survival (PFS)
  • Time to response (TTR)
  • Overall survival (OS)
  • Duration of response (DoR)
  • Complete response rate (CRR)
  • Pharmacokinetics (PK) of PTX-100: Cmax
  • Pharmacokinetics (PK) of PTX-100: Tmax
  • Pharmacokinetics (PK) of PTX-100: Cmin
  • Pharmacokinetics (PK) of PTX-100: AUCtau

Planned enrollment: 115 (estimated).

Where

Recruiting US sites

  • City of Hope Comprehensive Cancer Cente, Duarte, California
  • Yale Cancer Center, New Haven, Connecticut
  • Dana-Farber Cancer Institute, Boston, Massachusetts
  • Rochester Skin Lymphoma Medical Group. PLLC, Rochester, New York
  • Virginia Commonwealth University Massey Comprehensive Cancer Cente, Richmond, Virginia

6 recruiting sites outside the US. Site status as of Oct 30, 2026. Check the live record before contacting a site.

Sources

Where this comes from

Registry record reviewed as fetched Oct 30, 2026, last updated by the sponsor Sep 8, 2026. Public record; not medical advice.

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