Part 3 Leukoplakia - dental.pacific.edu
Transcript of Part 3 Leukoplakia - dental.pacific.edu
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NEOPLASMS OF THE SURFACE EPITHELIUM
(KERATINOCYTES)
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PapillaryLesions
KeratinocyteProliferations
MelanoticLesions
PrecancerousLesions
Carcinomas
Melanomas
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Normal Mucosa
Keratin layer
Spinous layer
Basal layer
SubmucosalConnectiveTissues
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Epithelial Lesions• Benign Surface Papillomas• Premalignant Lesions
– Oral – Skin
• Carcinoma– Squamous Cell, Verrucous– Basal Cell
• Benign Nevi• Malignant Melanoma
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Benign Oral Papillary and Verrucous Tumors
• Verruca vulgaris - HPV 2,4• Squamous papilloma - HPV 6,11
– solitary• Condyloma acuminatum - HPV 6,11
– Multiple• Keratoacanthoma HPV ?• Focal Epithelial Hyperplasia (Heck disease)
– HPV 13,32• Warty Dyskeratoma
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Verruca vulgaris• Clinical • Histopath and DNA
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Squamous Papilloma• Clinical, Gross
• Histopathology
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Condyloma Acuminatum• Clinical • Histopath & DNA
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Condyloma
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Focal Epithelial HyperplasiaHeck Disease
• Predominantly a childhood HPV disease• Multifocal papules and nodules, lips and buccal
mucosa• HPV 13, 32, viruses that only cause oral mucosal flat
warts• The phenotype may be seen in HIV infected patients• Spontaneous regression occurs in 6-12 months
without treatment• Microscopic: Dome shaped exophytic proliferations
of SSE, marked acanthosis, mitosoid (mitotic-like) bodies found in the mid-spinous layer
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FEH in HIV+ Subjects
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Keratoacanthoma
• A verrucous well circumscribed tumor of skin with self-limited growth
• Documented cases of spontaneous regression• Microscopic: Abrupt cup-like borders, marked
parakeratosis and acanthosis without cytologic atypia
• Treatment: simple excision• Cases with atypia should be considered low grade
squamous carcinomas
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Keratoacanthoma
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Verruciform Xanthoma
• A papillary lesions with keratosis• Tends to occur on the gingiva and palate• Benign lesion• Equal sex distribution• Microscopically: Hyperkeratosis, Papillary
pattern, Xanthoma (foam cell histiocytes) within the submucosal papillae
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Verruciform Xanthoma
Xanthomacells
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Warty Dyskeratoma
• An epithelial wary proliferation of skin or mucosa with distinct microscopic features
• A focal counterpart to Darier White disease (keratosis follicularis)
• Multiple, yet limited lesions are referred to as focal acantholytic dyskeratosis (Grover’s disease)
• Microscopic: Verrucous keratosis with villous rete pegs, acantholysis and dyskeratotic cells in spinous layer
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Warty Dyskeratoma
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Carcinogenesis – Oral Cancer
• Smoked Tobacco• The Smokeless Tobacco Issue• Alcohol• Carcinogens
– Polycyclic Hydrocarbons– Nitrosourias
• Human Papillomaviruses
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Carcinogenesis
• Oncogenes– Growth Factors– Growth Factor Receptors– Internal Signaling Pathway Mediators
• Tumor Suppressor Genes– Apoptotic Pathway Mediators– Cell Cycle Regulatory proteins
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HPV and p53
• HPV 16– Present in some leukoplakias and SCCA– Present in >60% of tonsilar/tongue base SCCA
• P53– Mutated in >60% of oral SCCA– Inactivated/nonmutated in HPV associated
SCCA
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LEUKOPLAKIAA Clinical Term
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Variants of Leukoplakia
• Homogeneous• Verrucous• Speckled
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Leukoplakia
• 20% precancerous change histologically
• Floor of the Mouth – 40% dysplastic
• 6% of all leukoplakias will progress to carcinoma within 5-7 years
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Leukoplakia
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Leukoplakia
White lesions that cannot berubbed away
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Leukoplakia
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Leukoplakia - Snuff Keratosis
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Toluidine Blue, detection of dysplasia
Application of dye
Acetic Acid
Dye retention
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Tissue Sampling (BIOPSY)
Brush Biopsy
Punch Biopsy
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Benign Keratosis
hyperorthokeratosishyperparakeratosis
acanthosis
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Histologic Spectrum of Leukoplakia
• Hyperorthokeratosis
• Hyperparakeratosis
• Acanthosis
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Hyperkeratosis/Acanthosis
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Grades of Epithelial Dysplasia
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Histologic Spectrum of Leukoplakia
• Mild Dysplasia
• Moderate Dysplasia
• Severe Dysplasia
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Histologic Spectrum of Leukoplakia• Squamous Cell Carcinoma
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Erythroplakia
• Velvety red patch of unknown etiology• More rare than leukoplakia• Soft Palate, Floor of Mouth, Lateral Tongue• 90% chance for dysplasia• Often mixed with leukoplakic areas
– (Leukoerythroplakia)– (Speckled leukoplakia)
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Erythroplakia
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Erythroleukoplakia (Speckled)
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Proliferative Verrucous Leukoplakia
• Predilection for elderly females• Only 40% use tobacco• Predilection for gingiva, mucobuccal fold• Persistant and Diffuse• High Recurrence
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Proliferative Verrucous Leukoplakia
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PVL
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PVL - Histopathology
• Varies from verrucous hyperkeratosis to verrucous carcinoma, papillary squamous cancer and invasive carcinoma
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Lichen Planus and Oral Cancer• Oral LP occurs in .5% of the population
• PREVALENCE: 1-2% of patients with OLP develop oral cancer (1:100) over follow up periods of 5-10 years
• INDICIDENCE: Oral SCCA in US (35,000:298,000,000 or approximately 1.2/10,000 (.012%) Estimate over 10 year and 20 year follow up periods.
• ODDS RATIOS:*– 1 year Follow up 1.0%:0.012% > 83.3 – 10 year Follow up 1.0%:0.12% > 8.3– 20 year Follow up 1.0%:0..23% > 4.3
*Oral Ca over 10 year period 350,000/298,000,000 (.12%)*Oral CA over 20 year period 700,000/298,000,000 (.23%)
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Squamous Cell Carcinoma• Ulcerated, indurated, white/red, fixed tumefaction• Anterior mouth: Well differentiated, good prognosis• Posterior mouth: Less differentiated, poor prognosis• Lateral tongue, floor of mouth are favored sites
although SCCA can occur anywhere in the oral mucosa
• 70+% smoking and alcohol• Tonsilar pillar, base of tongue: HPV 16• Tumor suppressor gene mutations (p16, p53)• Prognosis: no nodes>70% 5 year survival;
+ nodes> 35% 5 year survival
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Squamous Cell Carcinoma
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Squamous Cell Carcinoma
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Papillary SCCA
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Oral Squamous Cell Carcinoma Cervical Node Metastasis
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TNM classification for Head and Neck Cancer
• T = size of Primary Tumor– To: no evidence of tumor– T1: carcinoma in situ– T2: 2 cm or less– T3: 2-4 cm– T4: invasion of adjacent tissues
• N = regional lymph node involvement– No: no palpable nodes– N1: suspicous, palpable node
ipsilateral– N2: suspicous, palpable node
contralateral– N3: large fixed node
• M = distant metastasis– Mo: no evidence of disease– M1: distant metastases present
Staging according to TNM classification
Stage I: T1NoMoStage II: T2NoMoStage III: T3NoMo,
T1N1Mo, T2N1M0, T3N1Mo
Stage IV: T1N2Mo, T1N3Mo, T2N2Mo, T2N3Mo,T3N2Mo, T3N3Mo, any case with M1
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Keratoses of the Face & Lips
• Seborrheic Keratosis• Actinic Keratosis• Actinic Cheilitis
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Skin Keratoses• Seborrheic Keratosis
– Elderly males, facial skin, brown oily– Not precancerous
• Actinic Keratosis– Elderly males, facial skin, red and scaley– Precancerous, squamous cell CA
• Actinic Cheilitis– Elderly males, lower lip, white lesion– Precancerous, squamous cell CA
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Seborrheic Keratosis
• Clinical • Histopathology
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Actinic Cheilitis
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Basal Cell Carcinoma
• Facial Skin• Keratosis, Ulcer with rolled borders• Elderly• Actinic Radiation• Nonmetastasizing• Other adnexa (sebaceous, sweat, hair)
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Basal Cell Carcinoma• Cutaneous Ulcer • Histopathology
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Squamous Cell Carcinoma
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Variants of SCCA
• Histologic Grade– Keratinizing– Nonkeratinizing
• Verrucous Carcinoma• Spindle Cell Carcinoma
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Clinical Features SCCA
• >50 years• In nonsmokers - >50 years• >80% smoke cigarettes• Alcohol is a risk cofactor• Lateral tongue, Floor of mouth• Prognosis:
– Anterior portion of mouth – better– Posterior portion of mouth - worse
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Therapy for Oral Cancer• Laser Ablation• Surgical Excision• Radiation Therapy• Neck Node Management
– Partial Lymph Node Dissection– Radical Lymph Node Dissection– Radiation to the Neck
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MRI Imaging for Head and Neck Cancer
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Histopathology SCCA
• Well differentiated • Poorly differentiated
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Verrucous Carcinoma
• Elderly• White keratotic• Cauliflower or “Verrucous”• Noninvasive, pushing margins• Parakeratin crypts• Nonmetastasizing
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Verrucous Carcinoma• Clinical • Histopathology
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Benign Melanocytic Nevi
• Nevocellular– Junctional– Compound– Intradermal/Intramucosal– Specific Types (Ota, Ito)
• Blue Nevi– Common– Cellular
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Cutaneous Nevi
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ORAL NEVI
• All histologic types are seen• Melanocytes are normally present
in the basal layer• Palate>Gingiva>Buccal Mucosa• Malignant transformation is very
rare
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Oral Nevi
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Nevi• Junctional
• Intramucosal
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Blue Nevus
s100
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MELANOTIC MACULE
• Oral Freckle or Ephelis• Lips>Gingiva>Palate• Basilar Melanosis• Melanin Incontinence • No Malignant Potential
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Melanotic Macule
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Melanotic Macule
Basilar melanosis S100 protein
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Melanoacanthoma
• Most common among African descent individuals
• Focal pigmented macule or plaque• Basilar melanocytic hyperplasia with
dendritic cells in spinous layer• Not premalignant
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Melanoacanthoma
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Malignant Melanoma
• Melanoma in situ• Superficial Spreading• Nodular
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ORAL MUCOSAL MELANOMA
• Anterior Maxillary Gingiva>Palate• More common in Japan• Highly lethal, metastasize widely• Not classifiable by Clark levels
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Superficial Spreading Melanoma
• Clinical • Histopathology
![Page 82: Part 3 Leukoplakia - dental.pacific.edu](https://reader030.fdocuments.us/reader030/viewer/2022012019/61687435d394e9041f6fae3c/html5/thumbnails/82.jpg)
Nodular Melanoma
• Clinical • Histopathology
![Page 83: Part 3 Leukoplakia - dental.pacific.edu](https://reader030.fdocuments.us/reader030/viewer/2022012019/61687435d394e9041f6fae3c/html5/thumbnails/83.jpg)
Oral MelanomaSuperficial spreading
![Page 84: Part 3 Leukoplakia - dental.pacific.edu](https://reader030.fdocuments.us/reader030/viewer/2022012019/61687435d394e9041f6fae3c/html5/thumbnails/84.jpg)
Oral MelanomaNodular
![Page 85: Part 3 Leukoplakia - dental.pacific.edu](https://reader030.fdocuments.us/reader030/viewer/2022012019/61687435d394e9041f6fae3c/html5/thumbnails/85.jpg)
Bresloe Scale is measured as depth of invasion in mm
Thin Melanoma