Dr. Kevin Ko on Biomarkers, Oral Dysplasia, and the Limits of H&E Diagnosis

Christine interviews Dr. Kevin Ko (DMD, MD), a pathologist at the BC Cancer Agency with training in oral and maxillofacial pathology, anatomic pathology, and dermatopathology. They discuss his ASDP 2025 lecture on using p53 in oral dysplasia as a potential new approach and the broader problem of diagnostic discordance and over-diagnosis when relying on H&E alone. Dr. Ko shares examples from practice, including recognizing oral porokeratosis (previously followed as dysplasia for years) and a chemotherapy-related lip lesion initially suspected to be severe dysplasia but supported by wild-type biomarker results and clinical history, resolving after stopping chemotherapy drugs. He emphasizes the need for reproducible biomarkers and possibly molecular-based classification to improve consistency and patient outcomes, while also describing the pressure to be near-perfect in pathology, the risk of burnout, and efforts to build sustainable systems (QA sessions, colleague consultation, protected time). The conversation closes with his approach to presentations as storytelling, interest in prospective multi-center research, and a final message about balancing perfectionism with rest while remaining open-minded to new diagnostic methods to improve patient care.

00:00 Welcome & Meet Dr. Kevin Ko (DMD/MD, Dermpath at BC Cancer)

01:00 The Controversial Idea: Using p53 Biomarkers in Oral Dysplasia

01:18 Oral vs Skin Pathology: Discovering Porokeratosis in the Mouth

02:07 Diagnostic Error & Overdiagnosis: Why Reproducible Biomarkers Matter

05:19 Case Study: “Severe Dysplasia” vs Toxic Erythema of Chemotherapy —Context Changes Everything

06:36 The Perfectionism Trap in Pathology (and Why 95% Isn’t Good Enough)

08:04 Burnout, QA Systems, and Building Sustainable Workflows

09:14 Work–Life Balance, Kids, and Choosing Priorities (Family vs Research)

11:14 How to Build a Great Talk: Storytelling, Cases, and Future Studies

11:38 Final Takeaways: Balance, Open-Mindedness, and Better Diagnostics

Dr. Raymond Barnhill on Diagnostic Drift, Uncertainty, and the MPATH-Dx V2.0 Approach to Melanocytic Lesions

In this episode of The Girl Doc Survival Guide, Christine interviews Dr. Raymond Barnhill, a world-recognized dermatopathology expert known for work on diagnostically challenging melanocytic lesions, melanoma pathology references, and contributions to WHO skin tumor classification and AJCC melanoma staging. Dr. Barnhill shares career anecdotes and key communities at Yale and in Boston, collaborations with numerous melanoma leaders, and the founding of the North American Melanoma Pathology Study Group and the International Melanoma Pathology Study Group, as well as participation in the NIH-funded MPATH Study Group. The discussion focuses on overdiagnosis, underdiagnosis, and diagnostic discordance in melanocytic lesions, including evidence of diagnostic drift toward calling more lesions melanoma over time and the overlap between melanoma criteria and atypical/dysplastic nevi. He describes MPATH research, explains the revised MPATH-Dx V2.0 schema, explicitly recognizing uncertainty along a continuum rather than a strict benign/malignant threshold. He emphasizes practical diagnostic approaches including measuring lesion size (noting a 4 mm threshold associated with conventional dysplastic nevi and increasing concern at larger sizes), focusing on key architectural features (junctional nest variation/disarray and lentiginous proliferation), using nuclear size relative to keratinocyte nuclei (including a 1.5× threshold and counting atypical cells per high-power field) while accounting for site-specific pitfalls such as scalp nevi. The conversation also covers “gestalt” versus systematic review, the importance of due diligence using full clinical and morphologic information before ancillary testing, and cautions against overreliance on immunohistochemistry or molecular tests. Dr. Barnhill closes with career advice ends with a message that setbacks can be opportunities for growth.

00:00 Welcome + Meet Dr. Raymond Barnhill (Dermatopathology Legend)

01:51 Career Origins & Melanoma Pathology Mentors (Yale → Boston)

03:59 Building Melanoma Pathology Study Groups (North American & International)

05:57 Overdiagnosis, Diagnostic Drift & Why Discordance Happens

09:43 Inside the MPATH Study: Measuring Interobserver & Intraobserver Agreement

11:39 MPATH-Dx V2.0 Explained: Standardized Classes & Treatment Guidance

13:59 Redefining “Low-Risk” Melanoma: Stringent pT1a Criteria + Embracing Uncertainty

18:47 Practical Grading Tips: Lesion Size, Architecture & Nuclear Atypia Thresholds

22:42 Gestalt vs Due Diligence: Avoiding Traps + Using IHC/Molecular Wisely (PRAME)

28:39 Career Advice: Passion, Mentors, Community + Final Reflections

Balancing Careers and Family: Insights from Dr. Thomas Helm

In this episode of The Girl Doc Survival Guide, Christine invites Dr. Thomas Helm, MD, for his second appearance on the podcast. Dr. Helm, former Head of Dermatology and Director of Dermatopathology at Buffalo Medical Group, now working at Penn State Hershey Medical Center, shares his extensive experience and personal anecdotes. They discuss generational changes in the medical field, challenges faced by women in medicine, and the importance of work-life balance. Dr. Helm emphasizes the significance of understanding work culture, making intentional career decisions, and maintaining work-family harmony. He reflects on his career transition to academia and the rewarding relationships he has built along the way. The conversation delves into the importance of community, mentoring, and the profound impact of prioritizing meaningful relationships over individual autonomy.

00:00 Introduction and Guest Welcome

00:45 Personal Anecdotes and Family Influence

01:22 Changes in Medical Field Demographics

02:10 Challenges for Women in Medicine

02:39 Balancing Career and Family

04:50 Mentorship and Career Advice

06:46 Prioritizing Relationships and Community

10:53 Transition to Academia and Personal Growth

18:52 Final Thoughts and Gratitude