DysmenorrheaPhase 3NCT00902746

Efficacy and Safety, Long-Term Study of NPC-01 to Treat Dysmenorrhea Associated With Endometriosis

A Phase 3 study testing NPC-01 in people with Dysmenorrhea, run by Nobelpharma.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Trial summary

The purpose of this long-term study is to determine whether NPC-01 is effective in the treatment of dysmenorrhea associated with endometriosis. Read more about this study

Who is it for?: Ages 18 years and older, women only
Conditions the study is for: Dysmenorrhea
What is being tested?: NPC-01
Could I receive a placebo?: No, everyone receives an active treatment
How many people: 149 participants
Where: No sites listed yet
Study dates: May 2009to Feb 2012
Phase: Phase 3
Are there results?: Yes, posted in the registrySummary in the doctors' view

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

Ages 18 years and older
Women only
No healthy volunteers
Adult, Older adult

Who may be able to join

Dysmenorrhea associated with endometriosis

Who cannot join

Severe hepatopathy
Pregnant woman

About this study

Official title: Phase3, Open-Label, Long-Term, NSAID-Add-on, Clinical Trial of NPC-01 for Treatment of Dysmenorrhea Associated With Endometriosis.

The purpose of this long-term study is to determine whether NPC-01 is effective in the treatment of dysmenorrhea associated with endometriosis.

Conditions: Dysmenorrhea
Being tested: NPC-01
Medical subject headings: Dysmenorrhea

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

NPC-01Drug
This study consist of the following steps.
Step 1(Norethisterone 0.6mg, Ethinyl Estradiol 0.035mg):From first study medication to 3th menstrual cycles.
Step 2(Norethisterone 1mg, Ethinyl Estradiol 0.035mg):
After interim analysis of the results of step 1, in the case of the efficacy results meet prespecified criterion, same dose level will be continued to 13th menstrual cycles including step 1. If the results do not meet prespecified criterion, the dose will be increased to Norethisterone 1mg, Ethinyl Estradiol 0.035mg and be continued newly until 13th menstrual cycle from this point.

Study groups in NCT00902746
Study group	Role	What they receive
NPC-01	Experimental	Norethisterone, Ethinyl Estradiol Receives: Drug: NPC-01

What is being measured

The primary outcome is the main question the study is designed to answer.

Patient Response to Treatment for Dysmenorrhea, as Evaluated by Difference of Total Dysmenorrhea Score (Baseline/Pretreatment-End of Treatment)
The detail of dysmenorrhea score that was used in this study is the following. These subscales summed for a total dysmenorrhea score (minimum 0 to maximum 6). Pain score None 0 : None Mild 1 : There are some troubles for work Moderate 2 : Needing to rest in bed and/or affecting work Severe 3 : Morre than 1 day in bed and not possible to work
Drug score (during a menstrual period) None 0 : None Mild 1 : taking analgesics for 1 days Moderate 2 : taking analgesics for 2 days Severe 3 : taking analgesics more than 3 days
Measured: 52 weeks

Secondary outcomes (1)

Difference in the Visual Analog Scale (VAS) of Dysmenorrhea (Baseline/Pretreatment-dnd of Treatment)
VAS stands for Visual Analogue Scale of pain. The scale was rated as a graphic rating scale. as a 100mm baseline from 0:No pain to 100:Worst possible pain.
Measured: 52 weeks

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

May 2009Feb 2012

First posted15 May 2009 (estimated)
Study startMay 2009
Primary completionFeb 2012
Study completionFeb 2012

Resources

Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
Posted resultsParticipant flow, outcome measures and adverse events reported by the sponsor.
Other trials for DysmenorrheaStudies of the same condition, open and under way.
What the trial phases meanHow a treatment moves from first tests in people to approval.

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design

Study type: Interventional
Phase: Phase 3
Primary purpose: Treatment
Allocation: Not applicable
Intervention model: Single group
Masking: None (open label)
Enrolment: 149 participants (actual)

IDs, dates and publications

ClinicalTrials.gov ID: NCT00902746
Sponsor's protocol ID: NPC-01-1
Status last verified: Jun 2025
First submitted: 7 May 2009
Last updated: 15 Jun 2025
Results posted: Yes, on ClinicalTrials.gov
Data monitoring committee: Yes
FDA-regulated drug: No
FDA-regulated device: No

Want to know more?

The sponsor has not listed a contact. The official record may have more details.

Talk to your doctor first and take this page with you. Only the study team can confirm whether you can join.

Questions to ask the study team

What is the study trying to find out?
What would I need to do, and how often would I visit?
Could I receive a placebo instead of the treatment?
What are the possible risks and benefits for me?
Will it cost me anything? Are travel or time paid for?
Can I keep seeing my own doctor during the study?
What happens when the study ends?

Official record

Not yet recruiting
Radiofrequency and Pelvic Floor Exercise for Primary Dysmenorrhea
Primary Dysmenorrhea
Not yet recruitingPhase 2
PRECISION-E2: Teverelix in Women With Endometriosis - Pharmacodynamics, Safety and Precision Medicine Correlates
Endometriosis Pelvic, Endometriosis Ovaries
Not yet recruiting
Ultrasound-Guided Radiofrequency Ablation for Focal Adenomyosis
Adenomyosis, Adenomyoma of Uterus
Active, not recruiting
Mindfulness-Based Education For Women With Polycystic Ovary Syndrome
Polycystic Ovary Syndrome (PCOS), Menstrual Symptoms
Not yet recruiting
The Effect of a Ginger Formula on Menstrual Health vs a Placebo
Painful Menstruation

All Dysmenorrhea trials

Study at a glance

From the registry record, last updated by the sponsor on 15 Jun 2025. Recruitment status is as the sponsor reported it: confirm with the study team.

Official title: Phase3, Open-Label, Long-Term, NSAID-Add-on, Clinical Trial of NPC-01 for Treatment of Dysmenorrhea Associated With Endometriosis.
ClinicalTrials.gov ID: NCT00902746
Acronym / sponsor ID: NPC-01-1
Conditions: Dysmenorrhea
Phase: Phase 3
Study type: Interventional
Recruitment status: Completed
Enrolment: 149 participants (actual)
Lead sponsor: NobelpharmaIndustry (pharma, biotech, devices)
Study start: May 2009
Primary completion: Feb 2012 (actual)
Study completion: Feb 2012 (actual)
First posted: 15 May 2009 (estimated)
Results: Posted 13 Jun 2014

Clinical summary

The research question as the sponsor registered it. This describes what the study plans to test, not what it found.

The purpose of this long-term study is to determine whether NPC-01 is effective in the treatment of dysmenorrhea associated with endometriosis.

Study design

Primary purpose: Treatment
Allocation: Not applicable
Intervention model: Single group
Masking: None (open label)
Number of arms: 1

Arm	Type	Receives
NPC-01	Experimental	Drug: NPC-01Norethisterone, Ethinyl Estradiol

Who may qualify

Ages: 18 years and older
Sex: Female only
Healthy volunteers: Not accepted
Age groups: Adult, Older adult

Key inclusion criteria (1 listed)

Dysmenorrhea associated with endometriosis

Key exclusion criteria (2 listed)

Severe hepatopathy
Pregnant woman

Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.

Interventions

Intervention	Type	Arms
NPC-01This study consist of the following steps. Step 1(Norethisterone 0.6mg, Ethinyl Estradiol 0.035mg):From first study medication to 3th menstrual cycles. Step 2(Norethisterone 1mg, Ethinyl Estradiol 0.035mg): After interim analysis of the results of step 1, in the case of the efficacy results meet prespecified criterion, same dose level will be continued to 13th menstrual cycles including step 1. If the results do not meet prespecified criterion, the dose will be increased to Norethisterone 1mg, Ethinyl Estradiol 0.035mg and be continued newly until 13th menstrual cycle from this point.	Drug	NPC-01

Primary outcome

Patient Response to Treatment for Dysmenorrhea, as Evaluated by Difference of Total Dysmenorrhea Score (Baseline/Pretreatment-End of Treatment)
Time frame: 52 weeks
The detail of dysmenorrhea score that was used in this study is the following. These subscales summed for a total dysmenorrhea score (minimum 0 to maximum 6). Pain score None 0 : None Mild 1 : There are some troubles for work Moderate 2 : Needing to rest in bed and/or affecting work Severe 3 : Morre than 1 day in bed and not possible to work Drug score (during a menstrual period) None 0 : None Mild 1 : taking analgesics for 1 days Moderate 2 : taking analgesics for 2 days Severe 3 : taking analgesics more than 3 days

1 secondary outcome

Difference in the Visual Analog Scale (VAS) of Dysmenorrhea (Baseline/Pretreatment-dnd of Treatment)
Time frame: 52 weeks

Results and safety

Results posted to the registry on 13 Jun 2014, as reported by the sponsor. Figures are copied from the record, not re-analysed. Full results on ClinicalTrials.gov.

Participant flow

Group	Started	Completed
NPC-01	149	113

Primary outcome: Patient Response to Treatment for Dysmenorrhea, as Evaluated by Difference of Total Dysmenorrhea Score (Baseline/Pretreatment-End of Treatment)

Time frame: 52 weeks. Mean (Standard Deviation). Unit: units on a scale

Measure	NPC-01 n = 112
Value	2.4 (1.80)

Population analysed: This analysis was carried out for 112 patients whom end of study data was available on FAS.

1 secondary outcome is reported in the full results.

Adverse events

Time frame: From study administration to 15 cycles of menstruation, an average of 14 months. Other adverse events reported at 5% frequency or more

Group	Serious adverse events	Other adverse events	Deaths
NPC-01	5 of 147 (3.4%)	147 of 147 (100%)	Not reported

Loading the posted results from ClinicalTrials.gov…

Research links

Official record on ClinicalTrials.govLast updated by the sponsor 15 Jun 2025.
Posted resultsParticipant flow, baseline, all outcome measures and adverse events.

Related trials for Dysmenorrhea

Not yet recruiting
Radiofrequency and Pelvic Floor Exercise for Primary Dysmenorrhea
Primary Dysmenorrhea
Not yet recruitingPhase 2
PRECISION-E2: Teverelix in Women With Endometriosis - Pharmacodynamics, Safety and Precision Medicine Correlates
Endometriosis Pelvic, Endometriosis Ovaries
Not yet recruiting
Ultrasound-Guided Radiofrequency Ablation for Focal Adenomyosis
Adenomyosis, Adenomyoma of Uterus
Active, not recruiting
Mindfulness-Based Education For Women With Polycystic Ovary Syndrome
Polycystic Ovary Syndrome (PCOS), Menstrual Symptoms
Not yet recruiting
The Effect of a Ginger Formula on Menstrual Health vs a Placebo
Painful Menstruation

Referral and contact

AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.

Naoki Terakawa, M.D.,Ph.D. study director

Nissay Hospital,Osaka,Japan

Questions about this trial

What is this clinical trial studying?

A Phase 3 study testing NPC-01 in people with Dysmenorrhea, run by Nobelpharma.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 1 inclusion and 2 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 15 Jun 2025. Status can change between updates, so confirm with the study contact before making plans.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 3 studies compare the treatment with the current standard treatment or a placebo in a large group, to confirm how well it works and watch for side effects.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

Yes. Results are posted in the registry (first posted 13 Jun 2014). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Patient Response to Treatment for Dysmenorrhea, as Evaluated by Difference of Total Dysmenorrhea Score (Baseline/Pretreatment-End of Treatment) (time frame: 52 weeks). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT00902746.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 15 Jun 2025.