New hope for rare cancers: immunotherapy drug dostarlimab takes on chemo in phase 2 trial

NCT ID NCT06333314

First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This phase 2 trial is testing whether the immunotherapy drug dostarlimab can work better than standard chemotherapy as a first treatment for people with rare, advanced cancers that have a specific genetic flaw called dMMR/MSI. The study includes 120 adults with cancers like pancreatic, stomach, or small bowel cancer that cannot be surgically removed. Patients are randomly assigned to receive either dostarlimab or chemotherapy, and those on chemotherapy may switch to dostarlimab if their disease gets worse.

What this could mean

Our plain-language read of the trial. This is informational only — not medical advice or a prediction.

Active substance
Dostarlimab (an immunotherapy drug that helps the immune system attack cancer cells)
What this could lead to
If it works, this could provide a new first-line treatment option for people with rare cancers that have specific genetic features, potentially delaying disease progression.
What could go wrong
This is a phase 2 trial with only 120 participants, so results are preliminary. The drug may not work better than chemotherapy, and immunotherapy can cause immune-related side effects.

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

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Conditions

The condition(s) this trial relates to.

As listed by the trial registrant

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

Contacts and locations

Locations

  • CHU - Henri Mondor

    NOT_YET_RECRUITING

    Créteil, France

  • CHU Jean Minjoz

    NOT_YET_RECRUITING

    Besançon, France

  • CHU Morvan

    NOT_YET_RECRUITING

    Brest, France

  • CHU de Bordeaux - Hôpital Haut -Lèvêque

    NOT_YET_RECRUITING

    Pessac, France

  • CHU de Poitiers

    NOT_YET_RECRUITING

    Poitiers, France

  • CHU de Rouen

    NOT_YET_RECRUITING

    Rouen, France

  • CHU de Toulouse Hôpital Rangueil

    NOT_YET_RECRUITING

    Toulouse, France

  • Centre Eugène Marquis

    NOT_YET_RECRUITING

    Rennes, France

  • Centre François Baclesse

    NOT_YET_RECRUITING

    Caen, France

  • Centre Georges François Leclerc

    NOT_YET_RECRUITING

    Dijon, France

  • Centre Jean Perrin

    NOT_YET_RECRUITING

    Clermont-Ferrand, France

  • Centre Léon Bérard

    RECRUITING

    Lyon, France

  • Gustave Roussy Grand Paris

    NOT_YET_RECRUITING

    Villejuif, France

  • Hôpital Saint-Antoine

    NOT_YET_RECRUITING

    Paris, Île-de-France Region, France

  • Hôpital la Timone

    NOT_YET_RECRUITING

    Marseille, France

  • Institut Jean Godinot

    NOT_YET_RECRUITING

    Reims, France

  • Institut Mutualiste Montsouris

    NOT_YET_RECRUITING

    Paris, France

  • Institut Paoli Calmettes

    NOT_YET_RECRUITING

    Marseille, France

  • Institut de Cancérologie de Lorraine

    NOT_YET_RECRUITING

    Nancy, France

  • Institut de Cancérologie de l'Ouest

    NOT_YET_RECRUITING

    Angers, France

  • Institut de Cancérologie de l'Ouest

    NOT_YET_RECRUITING

    Saint-Herblain, France

  • Institut du Cancer Avignon-Provence

    NOT_YET_RECRUITING

    Avignon, France

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