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- W2997808550 abstract "Sir: We thank Drs. Roncati and Piscioli for their insightful comments regarding our work examining vertical growth phase as a prognostic factor for sentinel lymph node positivity in thin melanomas.1 Both of our groups have observed an association between vertical growth phase and sentinel node positivity in thin melanomas. Based on their earlier work,2,3 Drs. Roncati and Piscioli have proposed a histopathologic classification to guide clinical management, with sentinel lymph node biopsy recommended for subtypes of thin melanomas with a vertical growth phase or those with extensive regression, which may contain a vertical growth phase clone.4 Drs. Roncati and Piscioli suggest that thin melanomas with a vertical growth phase are generally of thickness greater than 0.8 mm and less than 1 mm, a subset of “thicker” thin melanomas more likely to result in a positive sentinel lymph node biopsy.5 Considered together, the implication is that the association between vertical growth phase and sentinel lymph node positivity may be driven by Breslow thickness. Although our meta-analysis confirms the observation that thin melanomas (defined as thickness >0.75 mm but <1.0 mm) are more likely to be associated with a positive sentinel lymph node biopsy, interestingly, we found that vertical growth phase was more strongly associated with sentinel lymph node positivity than Breslow thickness. Despite its seeming utility as a potential negative prognostic factor, vertical growth phase is not widely reported by dermatopathologists. Of the 93 studies included in our study, only seven studies reported on vertical growth phase. In contrast to other clinicopathologic features that can be measured and quantified (e.g., Breslow thickness and mitosis rate), vertical growth phase is less amenable to standardization.6 The fact that vertical growth phase is dependent on the experience and interpretation of individual pathologists is likely the greatest barrier to its wider adoption. The challenge of interpretation has previously been raised by Dr. Piscioli and colleagues in the context of atypical thin melanocytic lesions.7 Like Drs. Roncati and Piscioli, we feel that vertical growth phase is a histopathologic feature that may be used in addition to those outlined in the American Joint Committee on Cancer Staging Manual to identify a subset of aggressive thin melanomas. The utility of this histopathologic feature is, however, highly dependent on the experience and interpretation of dermatopathologists. When weighing the need for sentinel lymph node biopsy in a patient with a thin melanoma, communication between the treating surgeon and dermatopathologist is crucial. DISCLOSURE None of the authors has a financial interest to declare in relation to the content of this communication. Michael Bezuhly, F.R.C.S.C.Sarah E. Appleton, F.R.C.S.C.Zahir Fadel, M.D.Jason S. Williams, F.R.C.S.C.Division of Plastic and Reconstructive SurgeryDalhousie UniversityHalifax, Nova ScotiaDivision of Plastic and Reconstructive SurgeryMcMaster UniversityHamilton, Ontario, Canada" @default.
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- W2997808550 date "2019-02-01" @default.
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- W2997808550 title "Reply" @default.
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- W2997808550 doi "https://doi.org/10.1097/prs.0000000000005243" @default.
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