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Observational Study of Adults and Adolescents With Erythropoietic Protoporphyria (EPP) and X-linked Porphyria (XLP) (stEPP)

2026年4月28日 更新者：Portal Therapeutics, Inc.

Prospective Clinical Assessment Study in Adolescents and Adults With Erythropoietic Protoporphyria (EPP) and X-Linked Porphyria (XLP) (STEPP)

The purpose of this study is to collect information about the effects of EPP/XLP in adults and adolescents. This is an observational study in which participants will not receive any treatment. Study details include:

  • The study duration will be up to 6 months for each participant.
  • After Screening, participants will have a Baseline (Day 1) visit and return for visits every 4 weeks through 24 weeks.
  • Assessments to evaluate EPP/XLP will include clinical laboratory tests, physical exams, vital signs measurement, blood draws for PPIX concentration, reporting of EPP/XLP-related symptoms (including completion of a daily diary), light dosimetry.

研究概览

地位

招聘中

条件

研究类型

观察性的

注册 (估计的)

50

联系人和位置

本节提供了进行研究的人员的详细联系信息，以及有关进行该研究的地点的信息。

学习联系方式

学习地点

  • 加拿大
  • 土耳其（türkiye）
      • Ankara、土耳其（türkiye）
        • 尚未招聘
        • Gazi University Faculty of Medicine
        • 接触：
  • 意大利
      • Milan、意大利
        • 尚未招聘
        • Fondazione Irccs Ca' Granda Ospedale Maggiore Policlinico Di Milano
        • 接触：
      • Modena、意大利
        • 尚未招聘
        • Azienda Ospedaliero-Universitaria di Modena
        • 接触：
  • 挪威
      • Bergen、挪威
        • 尚未招聘
        • Haukeland University Hospital
        • 接触：
  • 比利时
      • Leuven、比利时
  • 法国
      • Bordeaux、法国
        • 尚未招聘
        • Centre Hospitalier Universitaire de Bordeaux - Hopital Saint - Andre
        • 接触：
      • Paris、法国
        • 尚未招聘
        • AP-HP Hopital Bichat - Claude Bernard
        • 接触：
  • 美国
    • Massachusetts
      • Boston、Massachusetts、美国、02114
        • 招聘中
        • Massachusetts General Hospital
        • 接触：
    • New York
      • New York、New York、美国、10029
        • 招聘中
        • Mount Sinai School of Medicine
        • 接触：
    • North Carolina
      • Wake Forest、North Carolina、美国、27587
        • 招聘中
        • Wake Forest University Baptist Health - Dept of Gastroenterology
        • 接触：
    • Pennsylvania
      • Philadelphia、Pennsylvania、美国、19121
    • Texas
      • Houston、Texas、美国、77030
        • 招聘中
        • University of Texas Health - Ertan Digestive Disease Center
        • 接触：
  • 英国
      • Cardiff、英国
        • 招聘中
        • University Hospital of Wales
        • 接触：
      • Dundee、英国
      • London、英国
        • 招聘中
        • Guy's Hospital
        • 接触：
      • Manchester、英国
  • 西班牙
      • Madrid、西班牙
        • 招聘中
        • Hospital Universitario 12 de Octubre
        • 接触：
      • Valencia、西班牙
        • 尚未招聘
        • Consorcio Hospital General Universitario de Valencia
        • 接触：

参与标准

研究人员寻找符合特定描述的人，称为资格标准。这些标准的一些例子是一个人的一般健康状况或先前的治疗。

资格标准

适合学习的年龄

  • 孩子
  • 成人
  • 年长者

接受健康志愿者

不

取样方法

非概率样本

研究人群

The study design and key inclusion criteria are focused on EPP/XLP and are inclusive of all potential participants, including those from underrepresented racial and ethnic populations. The sites and countries selected have diverse populations and the potential to enroll diverse participants.

描述

Inclusion Criteria:

  1. Aged 12 years and older.

  2. Confirmed diagnosis of EPP or XLP as follows:

    1. Genetic confirmation of EPP (FECH mutation with reduced ferrochelatase activity) OR
    2. Genetic confirmation of XLP (ALAS2 gain-of-function mutation) OR
    3. Elevated free PPIX levels in RBCs consistent with EPP/XLP, supported by clinical and/or family history.
  3. Currently has symptoms of EPP/XLP.
  4. History of consistent, non-painful prodrome within approximately 45 minutes of sunlight exposure and prior to phototoxic attacks, as self-reported by the participant.
  5. Willing and able to wear a light dosimetry device during the study.
  6. Willing and able to complete a daily diary of EPP/XLP symptoms.
  7. Willing and able to keep skin sites chosen for provocative sunlight exposure testing covered by opaque material when outside or exposed to potentially triggering light beginning 2 days prior to testing.
  8. Willing and able to provide informed consent and/or assent for the study.
  9. Study participants and LAR (as appropriate) are willing and able to comply with study visits and study procedures.

Exclusion Criteria:

  1. Diagnosis of another porphyria or another photodermatosis that may confound the characterization of EPP/XLP.
  2. Has a clinically significant disease or condition that, at the discretion of the Investigator or Sponsor, would interfere with the evaluation of EPP/XLP or study participation, or would make study participation not in the best interest of the participant.
  3. Is taking, or has taken within 60 days of Day 1, any medication, vitamin, or supplement that alters sensitivity to light exposure (eg, afamelanotide, melanotan, beta carotene, dersimelagon, or bitopertin).
  4. Concurrent or anticipated participation in an interventional clinical trial during the study period.

学习计划

本节提供研究计划的详细信息，包括研究的设计方式和研究的衡量标准。

研究是如何设计的？

设计细节

研究衡量的是什么？

主要结果指标

结果测量
措施说明
大体时间
Plasma Protoporphyrin IX (PPIX) Levels Over Time
大体时间：Screening; Baseline; Weeks 4, 8, 12, 16, 20, 24
Plasma protoporphyrin IX (PPIX) concentrations measured at specified study visits.
Screening; Baseline; Weeks 4, 8, 12, 16, 20, 24
Clinical History of Phototoxic Symptoms and Prodrome Timing
大体时间：Screening, Baseline, Weeks 4, 8, 12, 16, 20, 24
Medical history of EPP/XLP symptoms, including time to onset of prodromal sensations and occurrence of phototoxic reactions.
Screening, Baseline, Weeks 4, 8, 12, 16, 20, 24
Skin Damage Manifestations
大体时间：Screening, Baseline, Weeks 4, 8, 12, 16, 20, 24
Skin damage manifestations associated with EPP/XLP, including swelling, erythema, and chronic skin changes.
Screening, Baseline, Weeks 4, 8, 12, 16, 20, 24
Light Exposure and Phototoxic Reaction Data From Daily Diary
大体时间：Screening, Baseline, Weeks 4, 8, 12, 16, 20, 24
Daily recorded light exposure (including time spent outdoors), light dosimetry measurements, and occurrence of phototoxic reactions as captured in participant diaries.
Screening, Baseline, Weeks 4, 8, 12, 16, 20, 24
Sunlight Exposure Required to Induce Prodromal Symptoms
大体时间：Baseline and Weeks 4, 8, 12, 16, 20
Amount of sunlight exposure associated with onset of prodromal symptoms, along with corresponding plasma protoporphyrin IX (PPIX) levels.
Baseline and Weeks 4, 8, 12, 16, 20

次要结果测量

结果测量
措施说明
大体时间
Liver Function Test Results
大体时间：Baseline and Weeks 4, 8, 12, 16, 20, 24
Blood levels of liver function parameters (e.g., alanine aminotransferase [ALT], aspartate aminotransferase [AST], bilirubin) and corresponding plasma protoporphyrin IX (PPIX) levels.
Baseline and Weeks 4, 8, 12, 16, 20, 24

合作者和调查者

在这里您可以找到参与这项研究的人员和组织。

赞助

Portal Therapeutics, Inc.

研究记录日期

这些日期跟踪向 ClinicalTrials.gov 提交研究记录和摘要结果的进度。研究记录和报告的结果由国家医学图书馆 (NLM) 审查，以确保它们在发布到公共网站之前符合特定的质量控制标准。

研究主要日期

学习开始 (估计的)

2026年4月30日

初级完成 (估计的)

2027年3月1日

研究完成 (估计的)

2027年4月1日

研究注册日期

首次提交

2026年4月15日

首先提交符合 QC 标准的

2026年4月28日

首次发布 (实际的)

2026年5月5日

研究记录更新

最后更新发布 (实际的)

2026年5月5日

上次提交的符合 QC 标准的更新

2026年4月28日

最后验证

2026年4月1日

更多信息

与本研究相关的术语

关键字

其他相关的 MeSH 术语

其他研究编号

  • PORT-77-001

计划个人参与者数据 (IPD)

计划共享个人参与者数据 (IPD)？

是的

IPD 计划说明

What may be shared:

De-identified individual participant data (no direct identifiers)

Who can access it:

Qualified researchers with a scientifically sound research proposal

Conditions for access:

Submission and approval of a research proposal Execution of a data sharing agreement (DSA) Compliance with privacy regulations (e.g., GDPR, HIPAA as applicable)

How it will be shared:

Through a secure data access process managed by the sponsor or designated data-sharing platform

Timing:

Typically after study completion and/or publication of primary results

Purpose:

To support further research on EPP and XLP while protecting participant confidentiality

药物和器械信息、研究文件

研究美国 FDA 监管的药品

不

研究美国 FDA 监管的设备产品

不

此信息直接从 clinicaltrials.gov 网站检索，没有任何更改。如果您有任何更改、删除或更新研究详细信息的请求，请联系 register@clinicaltrials.gov. clinicaltrials.gov 上实施更改，我们的网站上也会自动更新.

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