Endometriosis Is Common. Why Is Getting Diagnosed So Hard?

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• Endometriosis is a common, painful disease where tissue resembling the uterine lining grows outside the uterus, often causing severe menstrual pain and gastrointestinal issues, sometimes starting before menarche.  Copied to clipboard!
• Diagnosis of endometriosis is notoriously difficult, taking an average of seven years due to societal squeamishness about menstruation and the lack of definitive, measurable metrics, often requiring surgery for confirmation.  Copied to clipboard!
• Dr. Linda Griffith shifted her tissue engineering expertise to endometriosis research, developing microfluidic lab models to study lesions in a controlled environment to find personalized treatments by targeting specific biological pathways.  Copied to clipboard!

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Introduction to Endometriosis

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(00:00:53)

• Key Takeaway: Endometriosis affects 1 in 10 people with a uterus, yet diagnosis averages seven years due to symptom dismissal.
• Summary: The episode opens by highlighting the commonality and diagnostic delay associated with endometriosis, a painful condition where uterine-like tissue grows outside the uterus. Listeners share experiences of suffering for years before receiving a diagnosis, often after symptoms were dismissed by medical professionals. Host Flora Lichtman introduces the episode’s focus: understanding the biology, treatment, and diagnostic challenges of the disease.

Defining Endometriosis and Symptoms

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(00:02:32)

• Key Takeaway: Endometriosis involves tissue resembling the endometrium growing in the abdominal cavity, causing symptoms like severe menstrual pain and GI issues that can precede menarche.
• Summary: Dr. Linda Griffith defines endometriosis as the growth of endometrium-like tissue, typically in the abdominal cavity on organs like the bowel. Symptoms include severe menstrual pain and heavy bleeding, but often involve gastrointestinal problems that can begin before a girl’s first period. The condition affects women and girls, and the onset of symptoms frequently precedes a formal diagnosis by many years or decades.

Reasons for Diagnostic Delay

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(00:03:34)

• Key Takeaway: Diagnostic delays stem from societal squeamishness about menstruation and the lack of objective metrics, forcing reliance on surgery for definitive diagnosis.
• Summary: The consistency of long diagnostic journeys is attributed partly to a general discomfort discussing menstruation, leading to patients being dismissed as dramatic. Unlike diseases with measurable blood parameters or clear imaging markers, endometriosis diagnosis often relies on a process of elimination leading to exploratory surgery. Surgery remains the definitive method for diagnosis.

Dr. Griffith’s Research Pivot

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(00:04:29)

• Key Takeaway: Personal experiences with her niece and her own delayed diagnosis motivated Dr. Griffith to apply her regenerative medicine engineering background to endometriosis research.
• Summary: Dr. Griffith transitioned her career, spurred by her niece’s dismissal and her own accidental diagnosis at age 28, to address the lack of progress in treating this disease. Encouraged by a surgeon colleague, she recognized that her engineering skills could bring new approaches to a condition lacking effective treatments. She pivoted toward building models of human organs using microfluidic chips, finding endometriosis a perfect application for this advanced modeling.

Biology of Lesion Location

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(00:07:47)

• Key Takeaway: Endometriosis lesions cause pain through inflammation and nerve growth, and they preferentially attach to tissues that contract, such as the bowel or diaphragm.
• Summary: Pain results from inflammation where nerves grow into the lesions, causing interaction between nerves and immune cells. Lesions can grow surprisingly far from the uterus, even invading the diaphragm or sciatic nerve. As an engineer, Dr. Griffith notes a pattern: lesions are attracted to tissues that exhibit muscle contraction, like the intestine or bladder, rarely invading non-contracting organs like the liver.

Theories of Origin

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(00:10:15)

• Key Takeaway: The two main theories for endometriosis origin are Sampson’s hypothesis (retrograde menstruation) and a developmental origin involving misplaced cells during fetal development.
• Summary: The precise cause remains unknown, but two primary theories exist: Sampson’s hypothesis suggests shed endometrial tissue implants in the abdominal cavity during menstruation. The second theory posits a developmental origin where cells destined to become endometrial tissue go astray during development and activate during puberty. Developmental origins can involve genetic predisposition or environmental factors impacting the mother during gestation.

Engineering Lesions in the Lab

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(00:14:28)

• Key Takeaway: Engineers create complex, vascularized lab models of endometriosis lesions using microfluidic chips to test personalized treatments based on patient genetics.
• Summary: Dr. Griffith applies engineering design principles to create platforms that mimic the hormone and immune environment of the lesions’ native habitat. These high-tech models involve growing tissue pieces with blood vessels from scratch, allowing researchers to observe growth over time. This platform enables testing how different genetic backgrounds influence disease phenomena and how specific drugs might interrupt lesion activity.

Current Treatment and Future Therapies

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(00:17:13)

• Key Takeaway: Current treatments involve hormone suppression (birth control, GnRH antagonists) or surgery, but the forefront of research focuses on novel drugs targeting specific inflammation pathways and improved diagnostics.
• Summary: First-line treatment suppresses estrogen using progestin-like birth control pills, progressing to menopause-inducing GnRH antagonists if symptoms persist, though both carry side effects. Standard imaging often misses the 70% of patients with tiny lesions, making surgery common. Promising new treatments target inflammation pathways identified by Dr. Griffith’s group, and significant activity is occurring in developing non-invasive diagnostics, potentially using menstrual blood.