Skin Cancer

Property of Prof. Dr. Mohamed Ali Nasr, Department of General Surgery, Faculty of Medicine, University of Zagazig, Egypt

1. Skin CancerSkin Cancer
Prof. Dr. Mohamed NasrProf. Dr. Mohamed Nasr

2. Largest organ of the body (15% of body weight)Largest organ of the body (15% of body weight)
Two main layersTwo main layers
–epidermisepidermis
stratified squamous epitheliumstratified squamous epithelium
contains 5 layerscontains 5 layers
–dermisdermis
connective tissue layerconnective tissue layer
Rests on subcutaneous layer or hypodermisRests on subcutaneous layer or hypodermis
Normal thickness of 1-2 mm, up to 6 mmNormal thickness of 1-2 mm, up to 6 mm
–thicker skin (palms & soles) has stratum lucidum, no hair thicker skin (palms & soles) has stratum lucidum, no hair
follicles or sebaceous glandsfollicles or sebaceous glands

3. Types of CancerTypes of Cancer
Melanoma-forms in melanocytes (skin Melanoma-forms in melanocytes (skin
cells that make pigment). cells that make pigment).
Basal Cell Carcinoma-forms in basal cells Basal Cell Carcinoma-forms in basal cells
(small, round cells in the base of the outer (small, round cells in the base of the outer
layer of skin).layer of skin).
Squamous cell carcinoma-forms in Squamous cell carcinoma-forms in
squamous cells (cells that form the squamous cells (cells that form the
surface of the skin).surface of the skin).

4. Neuroendocrine carcinoma-forms in Neuroendocrine carcinoma-forms in
neuroendocrine cells (cells that release neuroendocrine cells (cells that release
hormones in response to signals from the hormones in response to signals from the
nervous system).nervous system).
Melanoma is the most serious type of Melanoma is the most serious type of
cancer of the skin.cancer of the skin.
Basal and Squamous cell cancer are the Basal and Squamous cell cancer are the
two most common types of skin cancer.two most common types of skin cancer.

5. Basal cell carcinomaBasal cell carcinoma
Affects fair skinned adults(>40y) who have Affects fair skinned adults(>40y) who have
had a lot of sun exposure or repeated had a lot of sun exposure or repeated
episodes of sunburn(male>female)episodes of sunburn(male>female)
No Metastasis but BCCs can cause No Metastasis but BCCs can cause
destructive changes in surrounding destructive changes in surrounding
tissuestissues
Locally malignantLocally malignant

6. Basal cell carcinoma-types:Basal cell carcinoma-types:
Nodular BCC-most common typeNodular BCC-most common type
Superficial BCC-commonSuperficial BCC-common
Ulcerative (rodent ulcer)Ulcerative (rodent ulcer)
Pigmented BCC- can resemble melanomaPigmented BCC- can resemble melanoma
Turban BCCTurban BCC
Basisquamous BCC-mixed BCC/SCCBasisquamous BCC-mixed BCC/SCC

7. Nodular BBCNodular BBC

8. Superfacial spreading BBCSuperfacial spreading BBC

9. Nodular basal cell carcinomaNodular basal cell carcinoma

10. Pigmanted BCCPigmanted BCC

11. Turban tumor (Cylinderinoma)Turban tumor (Cylinderinoma)

12. KeratoacanthomaKeratoacanthoma

13. Why BCCs need treatmentWhy BCCs need treatment

14. BCC- treatment:BCC- treatment:
Excision with 5mm safety margin. Excision with 5mm safety margin.
Mohs micrographic excisionMohs micrographic excision
Imiquimod 5% cream-highly effective for Imiquimod 5% cream-highly effective for
superficial BCCssuperficial BCCs
CryotherapyCryotherapy
RadiotherapyRadiotherapy

15. Actinic keratosisActinic keratosis
Rough ,scaly spots on sun-damaged skinRough ,scaly spots on sun-damaged skin
Represent abnormal skin development Represent abnormal skin development
due to exposure to UV radiationdue to exposure to UV radiation
Should be considered potentially Should be considered potentially
precancerous(>10 AKs = 10-15% risk precancerous(>10 AKs = 10-15% risk
SCC)SCC)
Common on exposed sites eg backs of Common on exposed sites eg backs of
hands,face,scalp and ears of bald menhands,face,scalp and ears of bald men

16. Actinic keratosisActinic keratosis

17. Bowen’s diseaseBowen’s disease
Bowen’s disease is intraepidermal Bowen’s disease is intraepidermal
squamous cell carcinomasquamous cell carcinoma
It is effectively carcinoma-in situIt is effectively carcinoma-in situ
It may progress into squamous cell It may progress into squamous cell
carcinoma (approximately 5%)carcinoma (approximately 5%)
Because of this, it is very important to treat Because of this, it is very important to treat
it effectivelyit effectively

18. Bowen’s diseaseBowen’s disease
Presents as a pink or red ,irregular scaly Presents as a pink or red ,irregular scaly
patchpatch
Usually develops in a sun –exposed area Usually develops in a sun –exposed area
of skinof skin
Common sites include hands and face in Common sites include hands and face in
both sexes, scalp in men, lower legs in both sexes, scalp in men, lower legs in
womenwomen
Diagnosis should be confirmed by biopsyDiagnosis should be confirmed by biopsy

19. Bowen’s diseaseBowen’s disease

20. Xeroderma pigmentosaXeroderma pigmentosa

21. Squamous cell carcinomaSquamous cell carcinoma
SCC is a common type of skin cancerSCC is a common type of skin cancer
It develops in the epidermis from It develops in the epidermis from
squamous cells which produce keratinsquamous cells which produce keratin
Usual presentation is a slowly –growing Usual presentation is a slowly –growing
Can present as a non-healing sore or Can present as a non-healing sore or
ulcer “punched out” in appearanceulcer “punched out” in appearance
Sometimes growth is rapid over a matter Sometimes growth is rapid over a matter
of weeksof weeks

22. Squamous cell carcinomaSquamous cell carcinoma

23. Squamous cell carcinoma-causes:Squamous cell carcinoma-causes:
UV radiation-damages DNA in skinUV radiation-damages DNA in skin
SCC may develop in an actinic keratosis or patch of SCC may develop in an actinic keratosis or patch of
Bowen’s diseaseBowen’s disease
Genetic predisposition to develop SCCsGenetic predisposition to develop SCCs
Smoking-especially SCC lipSmoking-especially SCC lip
Thermal burnsThermal burns
Chronic leg ulcersChronic leg ulcers
Immunosuppression-Azathioprine/Ciclosporin.Immunosuppression-Azathioprine/Ciclosporin.
Organ transplantation patients highly susceptibleOrgan transplantation patients highly susceptible
Pre-existing skin conditions eg lichen sclerosus and Pre-existing skin conditions eg lichen sclerosus and
lichen planus can predispose to development of genital lichen planus can predispose to development of genital
and oral SCCsand oral SCCs

24. Marjolin ulcerMarjolin ulcer

25. Squamous cell carcinoma-Squamous cell carcinoma-
treatmenttreatment
Excision with 2cm safety margin +_ block Excision with 2cm safety margin +_ block
dissectiondissection
Radiotherapy may be neededRadiotherapy may be needed

26. Malignant melanomaMalignant melanoma
Melanocytes are found in the basal layers Melanocytes are found in the basal layers
of the epitheliumof the epithelium
Non-cancerous growth of melanocytes Non-cancerous growth of melanocytes
results in moles or frecklesresults in moles or freckles
Cancerous growth of melanocytes results Cancerous growth of melanocytes results
in malignant melanomain malignant melanoma

27. Malignant melanoma-risk factors:Malignant melanoma-risk factors:
Sun exposure, particularly during Sun exposure, particularly during
childhoodchildhood
Fair skin which burns easilyFair skin which burns easily
Blistering sunburn, especially when youngBlistering sunburn, especially when young
Previous melanomaPrevious melanoma
Family history of melanomaFamily history of melanoma
Previous non-melanoma skin cancerPrevious non-melanoma skin cancer
Large numbers of moles/ dysplastic molesLarge numbers of moles/ dysplastic moles

28. Common sites for melanoma:Common sites for melanoma:
In men commonest site is the backIn men commonest site is the back
In women commonest site is the legIn women commonest site is the leg
Can occur on mucous membranes, eg lips Can occur on mucous membranes, eg lips
or genitalsor genitals
Can occur under the nailCan occur under the nail
Can occur in eye or mouthCan occur in eye or mouth
BEWARE AMELANOTIC MELANOMABEWARE AMELANOTIC MELANOMA

29. The ABCDE of melanomaThe ABCDE of melanoma
A AsymmetryA Asymmetry
B Border irregularityB Border irregularity
C Colour variationC Colour variation
D Diameter over 6mmD Diameter over 6mm
E Evolving (enlarging or changing)E Evolving (enlarging or changing)

30. Malignant melanomaMalignant melanoma

31. When benign melanoma turn malignant, there are:
·Rapid growth (in size, thickness).
·Melanotic nodules around (satellite nodules).
·Induration.
·Metastasis in lymph nodes.
Development of tingling, itching, ulceration and bleeding

32. FrecklesFreckles

33. Lentigo MalignaLentigo Maligna

34. Lentigo maligna melanomaLentigo maligna melanoma

35. Growth of melanomasGrowth of melanomas
Horizontal growth within Horizontal growth within
epidermis=melanoma in situepidermis=melanoma in situ
Vertical growth through basement Vertical growth through basement
membrane into dermis=invasive membrane into dermis=invasive
melanomamelanoma
Once melanoma penetrates dermis,it Once melanoma penetrates dermis,it
spreads via lymphatic and blood streamspreads via lymphatic and blood stream
= metastatic melanoma= metastatic melanoma

36. Malignant melanomaMalignant melanoma

37. Histological classification:Histological classification:
Breslow thickness:Breslow thickness:
This is the thickness of the melanoma in mmThis is the thickness of the melanoma in mm
Clark’s level:Clark’s level:
This describes which layer of skin has been This describes which layer of skin has been
breachedbreached
Clark’s level 1-epidermis-melanoma in situClark’s level 1-epidermis-melanoma in situ
Clark’s level 2-dermal invasionClark’s level 2-dermal invasion
Clark’s level 5- invasion of subcutaneous fatClark’s level 5- invasion of subcutaneous fat

38. Treatment of melanomaTreatment of melanoma
Surgical excision with safety marginSurgical excision with safety margin
Thicker melanomas> wider excision +/- Thicker melanomas> wider excision +/-
sentinel node biopsysentinel node biopsy
Regional chemotherapyRegional chemotherapy

39. Prognosis of melanomaPrognosis of melanoma
Breslow thickness< 1mm, almost 100% Breslow thickness< 1mm, almost 100%
5 year survival5 year survival
Breslow thickness > 4mm, only 50%Breslow thickness > 4mm, only 50%
5 year survival5 year survival
Remember, melanoma is a major cause of Remember, melanoma is a major cause of
death from malignancy in young peopledeath from malignancy in young people

40. Superficial spreading melanomaSuperficial spreading melanoma

41. Nodular Nodular
Malignant melanomaMalignant melanoma

42. Lentigo Maligna melanomaLentigo Maligna melanoma

43. Acral melanomaAcral melanoma

44. Acral melanomaAcral melanoma

45. Advanced melanomaAdvanced melanoma

46. Cutaneous lymphomaCutaneous lymphoma

47. Metastatic nodules (pancreatic)Metastatic nodules (pancreatic)

48. Kaposi tumorKaposi tumor

49. AngiosarcomaAngiosarcoma

50. Merkel cell tumorMerkel cell tumor