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New registry sheds light on breast cancer during and after pregnancy

NCT ID NCT04603820

Knowledge-focused Sponsor: Spanish Breast Cancer Research Group Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing This study
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study collects information from about 866 women to better understand breast cancer that occurs during pregnancy, breastfeeding, or within a year after giving birth, as well as in women who become pregnant after breast cancer treatment. Researchers will track details like tumor size and patient age to learn more about how these situations affect diagnosis and outcomes. The study does not test any new treatments, but aims to improve knowledge for future care.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

866 people

The number who actually took part.

Started

Nov 2019

Expected to finish

Jan 2030

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

Patients with breast cancer in any of these three situations: 1. Patients with gestational breast cancer, defined as breast cancer diagnosed during pregnancy, breastfeeding or up to a year after delivery. 2. Patients who become pregnant after a breast cancer diagnosis. 3. Patients with breast cancer who have followed any fertility preservation technique prior to the start of breast cancer treatment.

Ages

18 years and older

Sex

Female participants only

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. The patient should have signed and dated the informed consent form (ICF). The enrollment of patients who have died is allowed. 2. Women aged ≥ 18 years. 3. Patients in one of the following situations: * Patients with breast cancer diagnosis during pregnancy, breastfeeding or within the year after delivery. * Patients with breast cancer who become pregnant after treatment. * Patients with breast cancer who were subjected to any fertility preservation method prior to the start of breast cancer treatment. 4. The patients referred to in the previous section and the patients who meet these characteristics prospectively could be enrolled retrospectively upon registry opening. 5. All cases diagnosed at the same site may be included. In order to prevent duplications, in case the patient followed her treatment and follow-up at another site, she will be enrolled as per the site where the diagnosis was made, requesting information of the treatment and progression, when possible. 6. Availability of clinical, epidemiological and progress data. Exclusion Criteria: Patients who do not wish to participate in the study for any reason could not be included in the study.

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Conditions

The condition(s) this trial relates to.

breast cancer breast neoplasm malignancy diagnosed during pregnancy

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Breast cancer and pregnancy

Contacts and locations

Locations

  • Complejo Hospitalario Reina Sofía

    Córdoba, 14004, Spain

  • Complejo Hospitalario de Galicia (CHUAC)

    A Coruña, La Coruña, 15009, Spain

  • Complejo Hospitalario de Navarra

    Pamplona, Navarre, 31008, Spain

  • Hospital Central de Asturias

    Oviedo, Principality of Asturias, 33011, Spain

  • Hospital Clinic i Provincial

    Barcelona, 08036, Spain

  • Hospital Clínico San Carlos

    Madrid, 28040, Spain

  • Hospital Clínico Universitario Virgen de la Arrixaca

    El Palmar, Murcia, 30120, Spain

  • Hospital Clínico Universitario de Valencia

    Valencia, 46010, Spain

  • Hospital General Universitario Gregorio Marañón

    Madrid, 28007, Spain

  • Hospital General Universitario de Albacete

    Albacete, 02006, Spain

  • Hospital General Universitario de Alicante

    Alicante, 03010, Spain

  • Hospital Nuestra Señora de la Candelaria

    Santa Cruz de Tenerife, Canary Islands, 38010, Spain

  • Hospital San Pedro de Alcántara

    Cáceres, 10003, Spain

  • Hospital Universitari Germans Trias i Pujol

    Badalona, Barcelona, 08916, Spain

  • Hospital Universitari i Politecnic La Fè

    Valencia, 46026, Spain

  • Hospital Universitario Doctor Negrín

    Las Palmas de Gran Canaria, Las Palmas, 35010, Spain

  • Hospital Universitario Miguel Servet

    Zaragoza, 50009, Spain

  • Hospital Universitario Mutua de Terrassa

    Terrassa, Barcelona, 08221, Spain

  • Hospital Universitario Puerta de Hierro

    Majadahonda, Madrid, 28222, Spain

  • Hospital Universitario San Cecilio

    Granada, 18016, Spain

  • Hospital Universitario Severo Ochoa

    Leganés, Madrid, 28911, Spain

  • Hospital Universitario Virgen del Rocío

    Seville, 41013, Spain

  • Hospital Universitario de Basurto

    Bilbao, Bizkaia, 48013, Spain

  • Hospital Universitario de Salamanca

    Salamanca, 37007, Spain

  • Hospital Unviersitari Son Espases

    Palma de Mallorca, Balearic Islands, 07120, Spain

  • Hospital Virgen de la Salud de Toledo

    Toledo, 45004, Spain

  • Hospital del Mar

    Barcelona, 08003, Spain

  • Instituto Valenciano de Oncología

    Valencia, 46009, Spain

More trials for these conditions

Other studies related to the condition(s) this trial covers.