Background
Pathologists use diverse terminology when interpreting melanocytic neoplasms, potentially compromising quality of care.
Objective
To evaluate the Melanoma Pathology Assessment and Treatment Hierarchy (MPATH-Dx) scheme, a five-category classification system for melanocytic lesions.
Methods
Participants (n=16) of the 2013 International Melanoma Pathology Study Group Workshop provided independent case-level diagnoses and treatment suggestions for 48 melanocytic lesions. Individual diagnoses (including, when provided, least and most severe diagnoses) were mapped to corresponding MPATH-Dx classes. Inter-rater agreement [95% CI] and correlation between MPATH-Dx categorization and treatment suggestions were evaluated.
Results
Most participants were dermatopathologists (n=12), age ≥50 years (n=12), male (n=9), US-based (n=11), and primary academic faculty (n=14). Overall, participants generated 634 case-level diagnoses with treatment suggestions. Mean weighted kappa coefficients for diagnostic agreement following MPATH-Dx mapping (assuming least and most severe diagnoses, when necessary) were 0.70 [0.68, 0.71] and 0.72 [0.71, 0.73], respectively, while correlation between MPATH-Dx categorization and treatment suggestions was 0.91.
Limitations
Small sample size of experienced pathologists in a testing situation.
Conclusion
Varying diagnostic nomenclature can be consistently classified into a concise hierarchy using the MPATH-Dx scheme. Further research is needed to determine whether this classification system can facilitate diagnostic concordance in general pathology practice and improve patient care.