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Melanoma
Alan L. Cowan, MD
Faculty Advisor: Anna M. Pou, MD
The University of Texas Medical Branch
Department of Otolaryngology
Grand Rounds Presentation
March 10, 2004
Melanoma
Almost 30% of all melanomas arise in the head
and neck
Widespread use of sunscreen has not lowered
the incidence.
Incidence is increasing almost 5% per year
Approximately 47,000 new cases in 2001
Predisposing Factors
Sun Exposure
Age, frequency, severity of exposure may play a role
Sunscreen use may not be protective
Familial Melanoma / DNS
Family members have almost 50% chance of developing melanoma
Lesions may be multiple and in sun shielded areas
Xeroderma Pigmentosa
Predisposes to several types of skin cancer
Skin malignancies often appear by age 10
Sunlight
UVB (280-320nm)
Causes direct DNA damage
Originally thought to be primary factor
Blocked by current sunscreens
UVA (320-400nm)
Causes indirect DNA damage via free radicals
Some now consider as more important than UVB
Sunscreen has little UVA protection
Types of Melanoma
Superficial Spreading
Most common
Cells atypical but uniform in appearance
Nodular
Early invasion due to vertical growth
Acral Lentiginous
Appears on palms and soles
Histology shows heavily pigmented dendritic processes in the basal layer
Types of Melanoma
Desmoplastic May lack pigment
Peri-neural invasion is classic
Histologic exam may show “school of fish” appearance
Lentigo Maligna Melanoma May remain in-situ for decades
Can spread along hair follicles
Mucosal Often lack melanin
Conventional staging system does not apply
Site of lesion corresponds to prognosis
Nasal cavity best prognosis, 31% at 5-yrs
Paranasal sinuses worst prognosis, 0% at 5-yrs
Diagnosis
History
Family History
Sun exposure
Bleeding, pain
Physical
ABCD
Histology
H&E
S-100, HMB-45
Biopsy
Excisional
Recommended for small lesions
Margins of 2mm
Incisional
For larger lesions
Does not alter draining lymphatics
Punch
Same as incisional
Shave
Contraindicated
Needle
Contraindicated
Clark staging
Based upon histologic level of invasion
Level I – Epidermis only (in situ)
Level II – Invades the papillary dermis, but not to the
papillary-reticular interface
Level III – Invades to the papillary-reticular interface,
but not into the reticular dermis
Level IV – Into the reticular dermis
Level V – Into subcutaneous tissue
Breslow staging
Based upon absolute depth of invasion
Stage I – < 0.75 mm
Stage II – 0.76 – 1.5 mm
Stage III – 1.51 – 4.0 mm
Stage IV - > 4.0 mm
Prognosis by AJCC stage
Stage I < 0.75 – 96 %
0.75 – 1.5 – 87 %
Stage II 1.5 – 2.49 – 75 %
2.5 – 3.99 – 66 %
> 4.0 – 47 %
Stage III One node 45 %
Two nodes < 20 %
Stage IV 8 – 10 %
Percentages are five year survival except stage IV lesions which represent one year survival
Treatment - Stage II
Labs LDH
Radiology CXR
Possible CT for metastasis
Possible Lymphoscintigraphy
Excision 2 cm margins
Adjunctive Therapy Possible elective neck dissection
Possible sentinel lymph node biopsy
Possible elective radiation
Treatment - Stage III
Labs LDH
Possible LFT’s
Radiology CXR
CT neck
Possible CT abdomen, MRI brain
Excision 2 cm margins
Remove in-transit lymphatic basins
Neck dissection directed by site Posterolateral vs. Lateral vs. Supraomohyoid
Adjunctive Therapy Probable radiotherapy
Possible chemotherapy
Treatment - Stage IV
Labs CBC, LFT’s, LDH
Radiology CT Chest, Abdomen, Pelvis
MRI brain
Excision 2 cm margins
Remove in-transit lymphatic basins
Neck dissection directed by site Posterolateral vs. Lateral vs. Supraomohyoid
Adjunctive Therapy Radiation therapy
Consider chemotherapy as part of a clinical trial
Neck Dissection
Posterolateral ND
Lesions in occipital and posterior scalp areas
Lateral ND
Lesions on temple, forehead, anterior scalp
Supraomohyoid
Lesions of anterior face
Sentinel Lymph Node Biopsy
Used to determine nodal status in low-risk
tumors
Allows for limited surgical morbidity.
Has prognostic value for patient outcome
Sentinel Lymph Node Biopsy
Procedure
Preoperative lymph basin mapping using
lymphscintigraphy with Tc99
Preoperative injection of radiotracer allows for
intraoperative gamma counter localization
Intraoperative injection of iosulfan blue allows for
visual detection of involved nodes.
Allows for detection of sentinel nodes in 88-99% of
patients depending on the study cited.
Sentinel Lymph Node Biopsy
Incidence of positive SLNB ~12%
False negative rate < 2%
Three year survival rates for negative vs. positive SLNB were 96.8% and 69.9%, respectively
Multivariate analysis has shown that positive SLNB predicts survival more accurately than depth
Elective neck dissection has not been found to change outcome if SLNB is negative
Positive SLNB patients may be candidates for radiation therapy
Sentinel Lymph Node Biopsy
Recurrence following negative SLNB is most
commonly in the assesed lymphatics.
Gershenwald found that 80% of his regional
recurrences actually had melanoma in the
biopsied gland, but were missed on analysis
Use of S-100 or HMB-45 increases the
diagnostic value and may lower the false
negative rate.
Radiation
Indications include stage III or IV lesions
Patients with positive SLNB should be
considered
Decreases local recurrence rates to 85-88%
Does not affect overall survival
May be contraindicated for lesions near the eye
or for midline lesions
Chemotherapy
Numerous therapy modalities exist
No significant benefit has been found for any
therapy to date
Administration of chemotherapy should be done
as part of an ongoing clinical trial.
Bibliography
Lentsch, Eric; Myers, Jeffrey. “Melanoma of the Head and Neck: Current Concepts in Diagnosis and Management.” The Laryngoscope July 2001, 111:1209–1222.
Haywood, Rachel; Wardman, Peter; Sanders, Roy; Linge, Claire. “Sunscreens Inadequately Protect Against Ultraviolet-A-Induced Free Radicals in Skin: Implications for Skin Aging and Melanoma?” The Journal of Investigative Dermatology. 121:862-868, 2003.
Greene, Mark; et al. “High Risk of Malignant Melanoma in Melanoma-Prone Families with Dysplastic Nevi.” Annals of Internal Medicine. 102: 458-465, 1985.
Gershenwald, Jeffrey; et al. “Multi-Institutional Melanoma Lymphatic Mapping Experience: The Prognostic Value of Sentinel Lymph Node Status in 612 Stage I or II Melanoma Patients.” Journal of Clinical Oncology. 17 (3), 199:pp 976-83.
Bibliography
Gershenwald, Jeffrey; et al. “Patterns of Recurrence Following a Negative Sentinel Lymph Node Biopsy in 243 Patients With Stage I or II Melanoma.” Journal of Clinical Oncology. 16 (6), 1998: pp 2253-60.
Ang, K.; et al. “Postoperative Radiotherapy for Cutaneous Melanoma of the Head and Neck Region.” International Journal of Radiation Oncology. 30 (4) 1994: pp 795-98.
Braud, Filippo; et al. “Malignant Melanoma.” Critical Reviews in Oncology/Hematology. 47 (2003) 35-63.
Alex, James C. “The Application of Sentinel Node Radiolocalization to Solid Tumors of the Head and Neck: A 10-Year Experience.” The Laryngoscope. 2004 Jan;114(1):2-19.
Fauci, Anthony S.; et al. “Melanoma and Other Skin Cancers”. Harrison’s Principles of Internal Medicine. Chapter 88 McGraw-Hill, San Francisco, California. 1998.
Bailey, Byron. “Melanoma of the Head and Neck”. Head and Neck Surgery – Otolaryngology. J.B. Lippincott Company, Philadelphia, PA. 1993 pp1082-1090.