What Drives Field Clinical and Medical Roles?
In today’s fast-paced pharmaceutical and biotech landscape, field clinical and medical professionals are critical in ensuring both clinical trial and commercial success. There are two primary archetypal roles that emerge: the Clinical Trial Liaison (CTL) and the Medical Science Liaison (MSL). While both operate in the field and share common goals, their focus, responsibilities, and contributions to the product lifecycle vary.
This article will explore these distinctions, highlight how the CTL and MSL roles complement one another, and discuss how both can be strategically deployed to optimize outcomes across the product lifecycle.
Key Differences Between CTLs and MSLs: Clarifying the Roles
Before diving into the specifics of each role, it is important to first understand the key differences that define their unique contributions.
- CTLs exclusively support investigational products or new indications and are dedicated to ensuring the optimization of clinical trial sites. They engage with sites and investigators to ensure the smooth progression of studies, from feasibility assessment to patient enrollment and beyond.
- MSLs are primarily focused on scientific exchange and evidence generation for commercialized products. They function as field-based experts, engaging with external stakeholders, to drive scientific understanding and inform medical strategies.
Understanding these fundamental differences is important for maximizing the impact of each role and deploying them strategically.
CTLs: Ensuring Clinical Trial Success
CTLs are field based professionals focused on the development and execution of clinical trials, which are vital for the development of new therapies and indications. Their primary responsibilities are to gather information to guide protocol development, establish relationships with clinical trial sites and support the start-up and execution of clinical trials to ensure that they progress efficiently.
CTLs are responsible for:
- Supporting Study Execution: CTLs possess a wealth of local and regional knowledge and are a valuable resource to support site identification, site evaluation and site selection. They can also assist study teams with the navigation of local and regional regulatory bodies.
- Troubleshooting Enrollment Barriers: They work to identify and resolve challenges related to patient recruitment, particularly those arising from scientific or clinical interpretation. They also assist in the identification of potential referral sites and with mapping of the patient pathway
- Feedback for Protocol Optimization: CTLs gather feedback from trial sites to inform protocol design and improve study success.
- Providing Scientific Support: CTLs provide scientific guidance to investigators and site staff, by explaining the mechanism of action of the molecule and assisting the site in visualizing the correct patient profile for the study.
CTLs frequently hold advanced degrees (MD, PhD, PharmD) and possess significant experience in their therapeutic areas. Most importantly, they have extensive experience in clinical research (e.g., as investigators, study coordinators, or trial managers) and possess an in-depth understanding of study execution. Their expertise is crucial for the smooth and efficient conduct of clinical trials.
MSLs: Driving Scientific Exchange and Insights
The MSL is a scientifically trained field professional dedicated to fostering peer-to-peer scientific exchange with healthcare professionals (HCPs) and key opinion leaders (KOLs). MSLs provide fair balanced scientific information in support of near launch or commercialized products.
MSLs are responsible for:
- Communicating Evidence-Based Information: MSLs specialize in conveying complex data on disease states, mechanisms of action, and evolving treatment landscapes.
- Generating Insights: They gather real-world feedback from clinicians and experts, which informs launch planning and medical strategy.
- Supporting Evidence Generation: MSLs support real world evidence generation and investigator-initiated research, encouraging the generation of new scientific evidence.
- Providing Internal Scientific Support: MSLs play a key role in training cross-functional teams, such as commercial and market access teams, while guaranteeing their contributions are separate from any sales-driven objectives.
MSLs typically hold advanced degrees (MD, PhD, PharmD) and possess deep expertise in their therapeutic areas. Their goal is to enhance the scientific understanding of the disease and product landscape, ultimately shaping long-term medical strategies.
Deployment Across the Product Lifecycle: Where MSLs and CTLs Add Value
Different stages of the product lifecycle require different levels of focus from CTLs and MSLs. Here is how these roles contribute at key milestones:
- Early Development (Phase I–II):
CTLs take the lead in sharing best practices across sites and resolving barriers to subject identification and enrollment. MSLs provide specialized input on standard of care, unmet needs in the medical community, and assist with engagement of therapeutic experts. - Pivotal Development (Phase III) and Pre-Launch:
As clinical trials ramp up, CTLs continue to drive the success of pivotal trials by addressing scientific questions related to protocols and study design and assisting with subject identification. MSLs begin engaging more extensively with external stakeholders, gathering market insights, and refining medical strategy in preparation for launch. - Regulatory Submission to Approval:
MSLs lead external engagement by engaging with medical experts and other healthcare providers to understand their needs and concerns to help shape launch strategy. - Launch and Early Post-Launch:
MSLs are at the forefront of scientific education and market access, supporting early adopters and addressing complex clinical questions. CTLs may support any necessary label-expansion trials. - Mature Lifecycle Management:
As product indications mature, MSLs continue to support scientific differentiation, and real-world evidence studies
Real World Implications: How to Staff Your Organization
With the differences in skill sets and remit between the CTL and MSL roles, many organizations choose to staff both positions. This can be a challenge for smaller organizations with limited resources. In those cases, many organizations choose to initially hire CTLs to support their clinical trial pipeline but as the trials end and pre-launch preparation begins, they evolve the role from clinical trial support to commercial support and those CTLs begin to function as MSLs. There is significant value in this process as those individuals have a deep understanding of the product and strong relationships with the researchers that they can then bring into the commercial space.
Conclusion: Optimizing CTL and MSL Deployment for Launch Excellence
When considering deployment of CTLs and MSLs, the key to success is integration of these roles into clinical and medical strategy. These roles must be strategically aligned within the organization to maximize the impact of each role across the product indication lifecycle. By strategically deploying both CTLs and MSLs, companies can ensure that their clinical trial execution is optimized and that their scientific strategies are aligned with market needs.
At The Medical Affairs Company, we understand the importance of both roles and how they contribute to launch excellence. By leveraging the right mix of clinical execution and scientific insight, companies can achieve success across the entire product lifecycle.
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