Rare is different. Why is your Medical Affairs playbook the same?

EDGE MEDICAL LIBRARY

Rare is different. Why is your Medical Affairs playbook the same?

A patient journey in rare disease can be as individual as the patient's fingerprint.

Rare disease challenges Medical Affairs in ways that go beyond simply working with smaller populations. Diagnosis may involve multiple specialties, evidence is often incomplete, expertise can be concentrated in a small number of centres, and patient journeys can differ substantially.

That means one neat, average pathway can hide the variation that matters.

In the latest Edge Medical Library review, we examine Ilma Nascimento's proposed six-pillar framework for Field Medical in rare disease: Scientific Mastery, Insight Intelligence, Center Development, System Navigation, Strategic Partnership and Impact Measurement.

Our infographic summarises the rare-disease context and the six proposed Field Medical pillars.

What stood out to us

1. Scientific mastery means explaining uncertainty, not hiding it. In rare disease, MSLs may need to integrate small trials, natural history, real-world evidence, endpoints and local-system context while being clear about what is known, what is uncertain and what may not transfer across settings.

2. Insights need discipline. A single observation may matter, particularly in a small expert or patient population, but it is not automatically a generalisable insight. Context, recurrence, triangulation and the decision an insight informs all matter.

3. System navigation belongs in the Medical Affairs conversation. Field Medical can often see where recognition fails, where referrals fragment and where scientific understanding is inconsistent across the pathway. That does not mean managing individual patients; it means identifying and communicating scientific barriers in the system.

4. Activity is not impact. The paper makes a useful distinction between outputs, intermediate outcomes and longer-term system outcomes. The further the outcome is from the Medical Affairs activity, the more cautious we should be about attribution.

The Edge view

The framework is useful because it brings familiar Field Medical capabilities together around the realities of rare disease. But it is a narrative review and proposed conceptual framework, not a validated competency instrument and not evidence that the model improves patient outcomes.

We think its real value is as a challenge to Medical Affairs teams: are your plans, capabilities and measures actually designed for the journeys and evidence environment you are working in?

Read the full Edge review

How this links to Edge capability development

Edge capability uplifts and workshops are grounded in established best practice and informed by emerging Medical Affairs literature. We critically appraise new work, consider its limitations, and translate relevant ideas into practical development for teams.

In rare disease, that may include scientific exchange under uncertainty, patient-journey and stakeholder mapping, insight-to-action, centre and ecosystem capability, cross-functional planning, and more credible measures of Medical Affairs contribution.

The literature informs the work; it does not replace judgement, local context or evidence of what actually works.

Talk to Edge about a capability uplift

Source: Nascimento I. Field Medical excellence in rare diseases: A narrative review and six-pillar conceptual framework. Research, Society and Development. 2026;15(7):e8215751452. DOI: 10.33448/rsd-v15i7.51452. Read the original paper  |  Read the Edge review The fingerprint analogy and practical applications above are Edge editorial interpretation; they were not tested in the paper.