Analysis of Melanocytes (Pigment Cells) in Sun-Exposed Skin

March 14, 2011 updated by: Mayo Clinic

Immunohistochemical Analysis of Melanocytes in Sun-Exposed Skin

The purpose of this study is to estimate and define the mean number, degree of confluence, and depth of penetration of melanocytes in chronically sun exposed skin of the head and neck using Mart-1 immunostains on frozen sections. The study was conducted to confirm whether similar results were found using permanent sections. The present study used hematoxaline and eosin (H&E) staining as well as Mart-1 staining, and included patients from both Mayo Clinic Jacksonville and Rochester.

Study Overview

Status

Completed

Conditions

Detailed Description

For each study participant we recorded their age, sex, state they lived in, tumor type, tumor location, recent sun exposure (during the two weeks prior to the surgery), whether or not a follicle was present on the slide, and if so the follicular extension (mm) from the granular layer, presence of atypia, nesting, pagetoid spread. Two slides were obtained; one stained with Mart-1; the other with H&E. For both, melanocyte counts per high power field (400 X HPF magnification) were obtained in three locations of the slide. The mean of the 3 counts was used for analysis, though the individual counts were considered in some data summaries (see below). Classification of photo-aging according to the Glogau scale was noted by the surgeon as type1: "no wrinkles"; type II "wrinkles in motion"; type III "wrinkles at rest" and type IV "only wrinkles." Confluence was categorized by the number of adjacent melanocytes as none, mild (2 side-by-side), moderate (3-6), or severe (7 or more).

Study Type

Observational

Enrollment (Actual)

100

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Sampling Method

Non-Probability Sample

Study Population

A total of 50 patients from Mayo Clinic Jacksonville and 50 Mayo Clinic Rochester will be enrolled in this study.

Description

Inclusion Criteria:

  • Participants undergoing Mohs and reconstructive surgery for basal cell and squamous cell carcinoma of the face and neck

Exclusion Criteria:

  • Participants with a history of radiation to the head and neck were excluded.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
The mean number of melanocytes per high power field for Mart-1 was 12.7 in FL and 11.2 in MN. Using H&E, the means were 10.3 and 8.3 for FL and MN respectively.
Time Frame: one year
one year

Secondary Outcome Measures

Outcome Measure
Time Frame
Evidence of higher means in FL than in MN after adjusting for age and gender (p<0.001 for H&E, p=0.08 for Mart-1) and strong evidence of an increase in observed numbers of melanocytes with use of the Mart-1 stain compared to the H&E stain (p<0.001)
Time Frame: one year
one year

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Mayo Clinic

Investigators

  • Principal Investigator: Lawrence E Gibson, MD, Mayo Clinic

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

September 1, 2007

Primary Completion (Actual)

December 1, 2007

Study Completion (Actual)

December 1, 2007

Study Registration Dates

First Submitted

April 2, 2009

First Submitted That Met QC Criteria

April 2, 2009

First Posted (Estimate)

April 3, 2009

Study Record Updates

Last Update Posted (Estimate)

March 15, 2011

Last Update Submitted That Met QC Criteria

March 14, 2011

Last Verified

March 1, 2011

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 07-002038

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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