Clinical trial Recruiting at 1 site Phase 2 Interventional

Resistant potato starch to reduce joint and muscle symptoms in people starting aromatase inhibitors for early-stage or high-risk breast cancer

Official title: Phase 2 Study of Aromatase Inhibitor-Associated Musculoskeletal Symptom Prevention With Resistant Potato Starch (AIMSS-RPS)

Run by University of Michigan Rogel Cancer Center · NCT07443943 · Data updated 2026-11-12

This phase II trial will test whether taking resistant potato starch can reduce joint pain and stiffness in people with stage 0–III or high-risk breast cancer who are starting aromatase inhibitor therapy.

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Quick facts

PhasePhase 2
Study typeInterventional
SexAll
Enrollment20 (estimated)
SponsorUniversity of Michigan Rogel Cancer Center
Academic / other
Drugs / interventionschemotherapy, immunotherapy
Locations1 site (Ann Arbor, Michigan)
StatusRecruiting
StartedApril 22, 2026
Main results expectedSeptember 2027
Study endsApril 2028
Registry record updatedApril 24, 2026
Trial IDNCT07443943 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are people with stage 0–III breast cancer or at high risk of breast cancer who are planning to start at least 24 weeks of standard aromatase inhibitor therapy, can take oral medication, and can read and consent in English.

Probably not a fit

People with distant metastatic breast cancer, those who are pregnant or breastfeeding, or those planning to receive concurrent chemotherapy, immunotherapy, or abemaciclib (all excluded) are unlikely to participate or derive benefit from this protocol.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This single-site phase II interventional trial will give participants an oral resistant potato starch supplement around the time they begin standard aromatase inhibitor (AI) therapy and follow them for at least 24 weeks. The rationale is that reduced levels of beneficial gut bacteria have been linked to AI-associated musculoskeletal symptoms, and resistant potato starch is a prebiotic that may promote growth of those bacteria. The trial will monitor musculoskeletal symptoms, safety, and tolerability while participants receive AI therapy. Participants are adults planning to start AI therapy for prevention or treatment of early-stage breast cancer and must be able to take oral medication and consent in English.

Why it matters

Potential benefit: If successful, this could reduce joint pain and stiffness and help people remain on aromatase inhibitor treatment.

How similar studies have gone: Early research has linked the gut microbiome to aromatase inhibitor–related joint symptoms, but using resistant potato starch for this purpose is a relatively novel approach without broad proven clinical success to date.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Patient who is planning to start standard-of-care AI therapy and receive treatment for at least 24 weeks. Can be planning to take AI therapy for stage 0-3 breast cancer or because they are at high risk of developing breast cancer. Concurrent gonadotropin-releasing hormone antagonist (GnRHa) therapy, anti-osteoclast therapy, anti-HER2 therapy, ribociclib, and/or PARP inhibitor are permitted
* Average joint pain 0-6 on a 0-10 scale during the 7 days prior to study enrollment
* Able to take oral medication
* Able to read and understand English
* Aware of the nature of her diagnosis, understands study requirement, and able to sign an informed consent form

Exclusion Criteria:

* Distant metastatic breast cancer
* Current or planned use of abemaciclib during study participation
* Current or planned use of chemotherapy or immunotherapy during study participation
* Pregnant or breast feeding, or planning to become pregnant during study participation
* Known active inflammatory bowel disease
* History of colectomy and/or gastric bypass
* Prior AI therapy except in the context of fertility treatment
* Planned use of prebiotics during study participation
* Use of estrogen supplementation other than vaginal estrogen
* Receipt of another investigational agent concurrent with participation in this trial

Where it's running

  • University of Michigan Rogel Cancer Center
    Ann Arbor, Michigan, United States
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.