# Phenotyping Responses to Optimize the Management of Pain Treatment in Endometriosis

> **NIH NIH R21** · UNIVERSITY OF FLORIDA · 2023 · $190,625

## Abstract

PROJECT SUMMARY/ABSTRACT
Endometriosis is a debilitating and progressive disease that affects 10% of reproductive-aged women.
Characterized by the presence of endometrial lesions outside of the uterus, endometriosis is associated with
chronic pelvic pain, bleeding, and infertility, with pain being the most debilitating symptom for which patients seek
care. Endometriosis results in tremendous economic and healthcare burden and greatly impacts quality of life.
Clinical practice guidelines for endometriosis recommend six months of conservative medical treatment for
suppression of local or systemic estrogen levels; however, substantial variation exists in the degree of pain relief
obtained from pharmacological therapy and some women subsequently require surgical removal of lesions,
suggesting that heterogeneity in disease and symptom presentation may underlie treatment response. Further,
the mechanisms that predict treatment failure and/or success are poorly characterized, thereby leaving providers
in a position of long-term symptom management and with little guidance regarding therapies that may achieve
the greatest efficacy. Quantifying this heterogeneity and identifying treatment response characteristics may be
a crucial step toward individualizing therapeutic approaches for endometriosis to reduce overall pain burden. In
line with the Precision Medicine Initiative, the aims of this prospective observational study are to explore
mechanisms associated with treatment response in patients undergoing guideline-based conservative medical
therapy for endometriosis, and to characterize associations between phenotypic profiles with pelvic pain severity
and pain impact trajectories. Premenopausal women ages 18 to 45 years with clinically suspected endometriosis
will be recruited and followed for a period of six months after undergoing conservative treatment according to
the American College of Obstetricians and Gynecologists clinical practice guidelines. Heterogeneity in pre-
treatment endometriosis symptom presentation will be quantified across the following measures: (1)
sociodemographic, (2) clinical, (3) biomedical, (4) pain quality, (5) behavioral, (6) psychological, and (7)
functional health. Patients will be followed monthly for six months to assess pelvic pain severity and pain impact.
Collectively, these aims have the potential to advance our understanding of phenotypic mechanisms underlying
conservative treatment response among women with endometriosis, effects which may serve as a foundation
for reducing unnecessary and ineffective medical treatments and lessening the time to proper diagnosis and
treatment.

## Key facts

- **NIH application ID:** 10705003
- **Project number:** 5R21HD104957-02
- **Recipient organization:** UNIVERSITY OF FLORIDA
- **Principal Investigator:** Meryl Joseph Alappattu
- **Activity code:** R21 (R01, R21, SBIR, etc.)
- **Funding institute:** NIH
- **Fiscal year:** 2023
- **Award amount:** $190,625
- **Award type:** 5
- **Project period:** 2022-09-15 → 2026-08-31

## Primary source

NIH RePORTER: https://reporter.nih.gov/project-details/10705003

## Citation

> US National Institutes of Health, RePORTER application 10705003, Phenotyping Responses to Optimize the Management of Pain Treatment in Endometriosis (5R21HD104957-02). Retrieved via AI Analytics 2026-05-24 from https://api.ai-analytics.org/grant/nih/10705003. Licensed CC0.

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