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

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00875381
Recruitment Status : Completed
First Posted : April 3, 2009
Last Update Posted : March 15, 2011
Information provided by:
Mayo Clinic

Brief Summary:
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.

Condition or disease
Carcinoma, Basal Cell Carcinoma, Squamous Cell

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).

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Study Type : Observational
Actual Enrollment : 100 participants
Observational Model: Case-Only
Time Perspective: Prospective
Official Title: Immunohistochemical Analysis of Melanocytes in Sun-Exposed Skin
Study Start Date : September 2007
Actual Primary Completion Date : December 2007
Actual Study Completion Date : December 2007

Primary Outcome Measures :
  1. 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 ]

Secondary Outcome Measures :
  1. 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 ]

Biospecimen Retention:   Samples Without DNA
The proposed dog-ears excised, that were to be discarded during reconstruction, were evaluated for the presence of any visible lesions (i.e. ephelid, lentigo, seborrheic keratosis, nevi). Dog-ears with any skin lesions were excluded. The specimens were inked by the surgeon on the side to be cut by the histotechnician. The specimens were placed in formalin bottles and submitted to the pathology department at Mayo Clinic Rochester for processing. The tissue was cut (4 microns) along its long access and stained with routine H& E and Mart-1 (MelanA) immunostains.

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
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.

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.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00875381

Sponsors and Collaborators
Mayo Clinic
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Principal Investigator: Lawrence E Gibson, MD Mayo Clinic

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Responsible Party: Lawrence E. Gibson, M.D., Mayo Clinic Rochester Identifier: NCT00875381     History of Changes
Other Study ID Numbers: 07-002038
First Posted: April 3, 2009    Key Record Dates
Last Update Posted: March 15, 2011
Last Verified: March 2011
Keywords provided by Mayo Clinic:
Additional relevant MeSH terms:
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Carcinoma, Squamous Cell
Carcinoma, Basal Cell
Neoplasms, Glandular and Epithelial
Neoplasms by Histologic Type
Neoplasms, Squamous Cell
Neoplasms, Basal Cell