This content does not have an English version.
This content does not have an Arabic version.
Skip to content
Care at Mayo Clinic
Patient-Centered Care
About Mayo Clinic
Request Appointment
Find a Doctor
Locations
Clinical Trials
Connect to Support Groups
Patient & Visitor Guide
Insurance & Billing
Departments & Centers
International Services
Contact Us
Patient & Visitor
Guide
Health Library
Diseases & Conditions
Symptoms
Tests & Procedures
Drugs & Supplements
Healthy Lifestyle
Books & Subscriptions
Diseases &
Conditions
For Medical Professionals
Medical Professional Resources
Refer a Patient
Continuing Medical Education
AskMayoExpert
Mayo Clinic Laboratories
Video Center
Journals & Publications
Mayo Clinic Alumni Association
Continuing Medical
Education
Research & Education at Mayo Clinic
Research
Research at Mayo Clinic
Research Faculty
Laboratories
Core Facilities
Centers & Programs
Departments & Divisions
Clinical Trials
Institutional Review Board
Postdoctoral Fellowships
Training Grant Programs
Education
Mayo Clinic College of Medicine and Science
Mayo Clinic Graduate School of Biomedical Sciences
Mayo Clinic Alix School of Medicine
Mayo Clinic School of Graduate Medical Education
Mayo Clinic School of Health Sciences
Mayo Clinic School of Continuous Professional Development
Mayo Clinic College of Medicine and
Science
Giving to Mayo Clinic
Give Now
Giving to Mayo Clinic
Frequently Asked Questions
Contact Us to Give
Make a
Donation
Request appointment
Log in
Search
Menu
Request appointment
Donate
Diseases & conditions
Find a doctor
Care at Mayo Clinic
Patient-Centered Care
About Mayo Clinic
Request Appointment
Find a Doctor
Locations
Clinical Trials
Connect to Support Groups
Patient & Visitor Guide
Insurance & Billing
Departments & Centers
International Services
Contact Us
Patient & Visitor
Guide
Health Library
Diseases & Conditions
Symptoms
Tests & Procedures
Drugs & Supplements
Healthy Lifestyle
Books & Subscriptions
Diseases &
Conditions
For Medical Professionals
Medical Professional Resources
Refer a Patient
Continuing Medical Education
AskMayoExpert
Mayo Clinic Laboratories
Video Center
Journals & Publications
Mayo Clinic Alumni Association
Continuing Medical
Education
Research & Education at Mayo Clinic
Research
Research at Mayo Clinic
Research Faculty
Laboratories
Core Facilities
Centers & Programs
Departments & Divisions
Clinical Trials
Institutional Review Board
Postdoctoral Fellowships
Training Grant Programs
Education
Mayo Clinic College of Medicine and Science
Mayo Clinic Graduate School of Biomedical Sciences
Mayo Clinic Alix School of Medicine
Mayo Clinic School of Graduate Medical Education
Mayo Clinic School of Health Sciences
Mayo Clinic School of Continuous Professional Development
Mayo Clinic College of Medicine and
Science
Giving to Mayo Clinic
Give Now
Giving to Mayo Clinic
Frequently Asked Questions
Contact Us to Give
Make a
Donation
Search for a doctor
Gretchen Johns, M.D.
Pathologist
Request an Appointment
Overview
Patient Stories
Print
PST-20225489
Home
Patient Stories
Make twice the impact
Double My Gift
Your gift can go twice as far to advance cancer research and care!
Double My Gift