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

Carcinoma, Squamous Cell Clinical Trial

Official title:

Immunohistochemical Analysis of Melanocytes in Sun-Exposed Skin

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT00875381
• Other study ID #: 07-002038
• Status: Completed
• Phase: N/A
• First received: April 2, 2009
• Last updated: March 14, 2011
• Start date: September 2007
• Est. completion date: December 2007

Study information

• Verified date: March 2011
• Source: Mayo Clinic
• Contact: n/a
• Is FDA regulated: No
• Health authority: United States: Institutional Review Board
• Study type: Observational

Clinical Trial 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.

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).

Recruitment information / eligibility

• Status: Completed
• Enrollment: 100
• Est. completion date: December 2007
• Est. primary completion date: December 2007
• Accepts healthy volunteers: No
• Gender: Both
• Age group: 18 Years and older

Eligibility

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 Design

Observational Model: Case-Only, Time Perspective: Prospective

Related Conditions & MeSH terms

• Carcinoma
• Carcinoma, Basal Cell
• Carcinoma, Squamous Cell

Locations

Country	Name	City	State
n/a

Sponsors (1)

Lead Sponsor	Collaborator
Mayo Clinic

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	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.		one year	No
Secondary	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)		one year	No