BACKGROUND. Patients with head and neck squamous cell carcinoma (HNSCC) METHODS. The authors performed chromogenic ISH analysis for HPV DNA on
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1 CANCER CYTOPATHOLOGY 171 Human Papillomavirus Genome Detection by in Situ Hybridization in Fine-Needle Aspirates of Metastatic Lesions from Head and Neck Squamous Cell Carcinomas Haldun Umudum, M.D. 1 Turkan Rezanko, M.D. 2 Filiz Dag, M.D. 2 Tugba Dogruluk, M.D. 2 1 Department of Pathology, Etimesgut Air Force Hospital, Ankara, Turkey. 2 Department of Pathology, Atatürk Training and Research Hospital, Izmir, Turkey. BACKGROUND. Patients with head and neck squamous cell carcinoma (HNSCC) often present with metastatic disease. The diagnosis of metastatic lesions usually is determined by fine-needle aspiration. Human papillomavirus (HPV) is now being considered as a causative agent in a subset of HNSCC. The objectives of this study were, first; to search for the presence of HPV DNA by in situ hybridization (ISH) in metastatic lesions from HNSCC using alcohol-fixed, archival, cytopathologic material; second, to characterize the cytologic features of HPV-positive metastatic lesions of HNSCC; and, third, to determine whether there is a correlation between the presence of HPV DNA and the origin of metastatic lesions. METHODS. The authors performed chromogenic ISH analysis for HPV DNA on fine-needle aspiration materials from metastatic lesions from 26 patients with HNSCC. Along with the ISH analysis, a detailed cytologic review was performed, and cytopathologic features were recorded. The HPV DNA status in metastatic lesion was correlated with cytopathologic features and primary tumor location. RESULTS. The integration of HPV DNA was visualized microscopically on tumor cell nuclei in 15% of aspirates. The anatomic locations of the study samples were as follows: 16 lymph node aspirates (11 cervical lymph nodes and 5 lymph nodes at other sites other), 5 tracheostomy sites, and 5 miscellaneous sites located on the head and neck area. Cytologic review revealed 13 keratinized and 13 nonkeratinized metastatic tumors. HPV DNA was detected in four metastatic sites (three lymph nodes and one tracheostomy site). All HPV DNA-positive tumors were of the nonkeratinizing type (P 0.05; Fisher exact test). The origins of HPV-positive tumors included two laryngeal sites, one nasopharyngeal site, and one oral cavity site. CONCLUSIONS. The current findings showed that archival cytology slides can be used for HPV DNA detection with ISH. The results also showed that HPV DNAcontaining HNSCC has distinctively nonkeratinizing cytologic features. The authors concluded that HPV DNA not only is involved in the initiation of tumoral processes but also plays an important role in the development of metastatic disease. Cancer (Cancer Cytopathol) 2005;105: American Cancer Society. Address for reprints: Haldun Umudum, M.D., Clinique Militaire Internationale du SHAPE; Avenue des Athens, 7010, Mons, Belgium; Fax: (011) ; humudum@yahoo.com Received July 26, 2004; revision received September 21, 2004; accepted December 20, KEYWORDS: human papillomavirus, head and neck squamous cell carcinoma, cytopathology, fine-needle aspiration, metastasis. About half a million patients worldwide are diagnosed with head and neck squamous carcinoma (HNSCC) annually. 1 Most patients have metastatic disease at the time of diagnosis. 2 Mortality rates among patients with advanced disease have not changed significantly 2005 American Cancer Society DOI /cncr Published online 8 April 2005 in Wiley InterScience (
2 172 CANCER (CANCER CYTOPATHOLOGY) June 25, 2005 / Volume 105 / Number 3 despite improvements in therapeutic and diagnostic procedures over the years. HNSCC has multifactorial etiology, and the most prominent etiologic factors are a history of tobacco and alcohol exposure. The risks of tumoral development with these agents are dose-related and timedependent. 3,4 Along with tobacco and alcohol exposure, the identification of human papillomavirus (HPV) in a patient with HNSCC in 1985 suggested a possible role of viral etiology in the tumorigenesis of HNSCC. 5,6 Since then, many studies have demonstrated the presence of HPV, and HPV is now under consideration as a causative agent in a subset of HNSCCs. 7 9 In a recent review, using polymerase chain reaction (PCR) analysis, HPV DNA was found in 34% of HNSCC tumors from all sites. 8,9 The objective of this study was to search for the presence of HPV DNA by in situ hybridization (ISH) in metastatic lesions from HNSCC using archival cytopathologic materials. Another objective was to characterize further the cytologic features of HPV-positive metastatic lesions in HNSCC. We also investigated the correlation between the presence of HPV DNA and the origin of metastatic lesions. MATERIALS AND METHODS We retrieved cytologic materials of previously diagnosed patients with metastatic HNSCC from the files of the Cytopathology Department of Izmir Atatürk Research and Training Hospital in Turkey. In addition, we sought relevant clinical information. All cytology materials were ethanol-fixed smears that had been obtained with conventional fine-needle aspiration. We reviewed cytologic materials for adequacy, confirmation of diagnosis, and grading. At the same time, we selected a representative slide for each case for ISH analysis. We excluded materials if they were not sufficient to discard one slide. We used the Fisher exact test for statistical analysis. Primary tumors were not tested, because they were not available in the majority of patients. ISH We performed chromogenic ISH with a probe that contained DNA from HPV subtype 6 (HPV-6), HPV-11, HPV-16, HPV-18, HPV-31, HPV-33, HPV-35, HPV-45, HPV-51, and HPV-52 (Dako Corporation). The ISH protocol was as follows: Alcohol-fixed, archival cytology slides were destained and rinsed in tap water for 5 minutes and rinsed twice for 3 minutes in distilled water. Heat-induced retrieval of slides was performed in a microwave oven with 0.01 M citrate buffer, ph 6.0, at 500 W for 5 minutes. After retrieval, slides were allowed to cool for 30 minutes and then were rinsed in 3 changes of distilled water. Slides were digested with 5 g/ml of proteinase K in 50 mm Tris-Cl, ph 7.5, for 5 minutes at room temperature and washed extensively with distilled water. Endogenous peroxidase was quenched with 3% H 2 O 2 for 10 minutes, and slides were washed with distilled water. Twenty microliters of biotin-labeled HPV probe solutions (DAKO Corporation) were applied to individual sections and coverslipped. Slides were denatured at 95 C for 5 minutes, and hybridization was carried out in a humidified box at 37 C for 90 minutes. After hybridization, the slides were washed 3 times in Tris-buffered saline (TBS) with 0.05% Tween 20 for 5 minutes each. Posthybridization stringency wash was in 0.1 sodium saline citrate/ 0.1% sodium dodecyl sulfate at 52 C for 10 minutes followed by a rinse in TBS-Triton X-100. Detection of hybridized probe was performed by chromogenic signal detection (DAKO 5-bromo-4-chloro-3-inodolyphosphate/nitroblue tetrazolium [BCIP/NBT] Substrate System; DAKO Corporation). Specimens were covered with BCIP/NBT solution and incubated for 30 minutes. Slides were rinsed gently with distilled water and coverslipped with glycergel. Tissue sections that were positive for HPV wide spectrum (HPV control slides; DAKO Corporation) were used as positive controls. Biotin-labeled plasmid probes served as negative controls. RESULTS We were able to identify 26 patients with sufficient cytologic material from the cytopathology archives. All materials were smeared fine-needle aspirations from metastatic lesions of HNSCC that were obtained by the same cytopathologist with a 27-gauge needle. All slides were fixed in alcohol. There were 16 aspirates from lymph nodes, 5 aspirates from tracheostomy sites, and 5 aspirates from miscellaneously located lesions. The origins of tumors were as follows: 9 laryngeal sites, 6 nasopharyngeal sites, and 11 oral cavity sites. Twelve patients were smokers. Fourteen patients were females. There were 4 patients with Stage IV HNSCC, and the remaining patients had Stage III NH- SCC. The results are depicted in Table 1. Cytopathologic Findings Metastatic carcinomas were classified broadly based on the presence of keratinization. Keratinizing-type tumors were classified further as either well differentiated or poorly differentiated. The nonkeratinizing tumors consisted of large polygonal cells with prominent and overlapping pleomorphic nuclei. Cytoplasm mainly was basophilic (Fig. 1). Ten of 16 lymph node
3 Human Papillomavirus DNA in HNSCC/Umudum et al. 173 TABLE 1 Cytologic Grading and Chromogenic In Situ Hybridization Results from 26 Patients with Metastatic Head and Neck Squamous Cell Carcinoma FNA site Origin of primary tumor HPV DNA status Grade Cervical lymph node 1 Gingival Negative WD 2 Larynx Negative WD 3 Larynx Negative WD 4 Larynx Negative PD 5 Nasopharyngeal Negative NK 6 Nasopharyngeal Negative PD 7 Nasopharyngeal Positive NK 8 Nasopharyngeal Negative PD 9 Oral cavity, NOS Negative NK 10 Oral cavity, NOS Positive NK 11 Oral cavity, NOS Negative NK Jugulodigastric lymph node 1 Larynx Positive NK 2 Nasopharyngeal Negative PD 3 Nasopharyngeal Negative NK Tracheostomy site 1 Larynx Negative WD 2 Larynx Negative WD 3 Larynx Negative WD 4 Larynx Negative WD 5 Larynx Positive NK Other sites Occipital lymph node Oral cavity, NOS Negative NK Supraclavicular lymph node Oral cavity, NOS Negative NK Buccal mucosa, recurrence site Oral cavity, NOS Negative PD Jaw, soft-tissue mass Gingival Negative PD Sternoidocleidomastoid muscle mass Oral cavity, NOS Negative NK Tongue, recurrence site Tongue Negative NK Tonsillectomy site, mass Tonsil Negative PD HPV: human papillomavirus; WD: well differentiated; PD: poorly differentiated; NK: nonkeratinizing; NOS: not otherwise specified. aspirates as well as 2 miscellaneously located lesions and 1 tracheostomy site lesion corresponded to this type. Keratinizing squamous carcinoma cells were large and sometimes had bizarre shapes, and the cytoplasm mainly was orangophilic (Fig. 2). Keratinizing HNSCCs are termed well differentiated if pearl formation or relatively low nuclei/cytoplasm ratio has been observed. Two lymph node aspirates and four tracheostomy site lesions were well differentiated keratinizing tumors. Four lymph node aspirates and three miscellaneously located lesions were in the poorly differentiated group (Table 2). HPV Study With ISH analysis, HPV DNA was visualized as dot-like signals inside the nuclei of tumor cells (Fig. 3). The signal intensity varied from one inconspicuous dot to many conspicuous dots in single tumor nucleus (Fig. 4). This punctuate pattern of hybridization has been correlated with viral DNA integration, and the number of dots were correlated with copy numbers of HPV DNA. 10 Among all of the lymph node aspirates, 3 aspirates (19%) were positive for HPV DNA (2 cervical lymph node aspirates and 1 jugulodigastric lymph node aspirate). One of 5 tracheostomy site lesions displayed signal (20%). None of the miscellaneously located lesions were positive for HPV DNA. Two metastatic tumors from laryngeal primary tumors (22%), 1 of 6 metastatic lesions from nasopharyngeal carcinomas (17%) and 1 metastatic lesion from an oral cavity primary tumor were positive for HPV (9%). The identification of HPV DNA according to primary tumor site is shown in Table 3. Statistical Analysis When tumors were stratified by cytologic grade, HPV DNA-positive tumors were of the nonkeratinizing type (Table 4). There was no significant correlation (P 0.9) between the presence of HPV in metastatic lesions and the origin of the primary tumor (whether oral or and nonoral). No correlations were found between HPV status and gender, tobacco use, or and disease stage. DISCUSSION In the current study, we detected HPV DNA in 22% of laryngeal metastases and in 12% of metastases from oral cavity-nasopharyngeal primary sites. Previous studies have shown the prevalence of variations of HPV DNA in HNSCC originating from different anatomic locations. Of these, the most common locations are palatine tonsil and oropharynx. 7,11 The rates of HPV DNA expression reported have varied among studies, and the overall expression HPV DNA has been reported between 7% and 36% in different studies evaluating HNSCC. 7,11,12 HPV DNA was identified in 7 26% of laryngeal primary tumors and in % of oral cavity primary tumors. 13,14 The current results in NHSCC metastases correspond to those prior investigations that evaluated primary tumors. It has been reported that HPV-positive squamous cell carcinomas have distinct histopathologic features Among these features, basal cell morphology is especially of interest. It has been reported that HPV-positive tonsillar carcinomas have nonkeratinizing basal cell morphology. 17 Likewise, in the genital tract, a distinct basaloid pattern for HPV DNA-positive
4 174 CANCER (CANCER CYTOPATHOLOGY) June 25, 2005 / Volume 105 / Number 3 FIGURE 1. In this fine-needle aspirate from metastatic head and neck squamous cell carcinoma, the tumor is of the nonkeratinizing type and is composed of pleomorphic nuclei with relatively scant cytoplasm. There is no evidence of keratin production. FIGURE 2. In this photomicrograph of well differentiated, metastatic head and neck squamous cell carcinoma, the cells are bizarre in shape, and the cytoplasm mainly is orangophilic. squamous cell carcinomas has been reported. 15,16,18 In our cytologic evaluation, we were unable to find a cytologic feature that corresponded to basaloid histopathology. However, our results showed that, although all HPV DNA-positive tumors were of the nonkeratinizing type, none of the keratinizing metastatic tumors contained HPV DNA. This difference was significant in our statistical analysis. The absence of keratinization in HPV DNA-containing tumors suggests that this mucosatrophic virus either preferably infects nonkeratinizing squamous cells or integrates to the host DNA, inhibiting keratinization. 19 Current studies have shown that HPV-positive oral-pharyngeal carcinomas are distinct entities. 9,16 The diagnosis of these distinct entities relies on HPV DNA detection. We believe that HPV DNA detection may increase the diagnostic ability of cytologic evaluation in patients who present with masses of the head
5 Human Papillomavirus DNA in HNSCC/Umudum et al. 175 and neck area, especially in specimens that contain limited numbers of cells. We used chromogenic ISH in our study for the detection of HPV DNA. Eighteen percent of all tested HNSCC samples were HPV-positive according to the ISH results. 7 Higher rates of detection were identified with Southern blot and PCR analyses. Except for in situ PCR, ISH it is the only method by which the HPV genome can be observed in topographic relation with pathologic lesions. Compared with PCR, ISH is inexpensive and is feasible for routine use. In addition, the complicated laboratory infrastructure that is mandatory for PCR is not required for ISH In the current study, we were not able to find a correlation between the primary tumor sites and HPV DNA status of metastatic sites; however, recent studies TABLE 2 Distribution of Metastatic Head and Neck Squamous Cell Carcinoma Subtypes by Anatomic Site Metastatic site Nonkeratinizing HNSCC Keratinizing HNSCC Well differentiated Lymph node Tracheostomy scar Miscellaneous sites a Total HNSCC: head and neck squamous cell carcinoma. a Recurrence sites and soft-tissue masses. Poorly differentiated have shown that HPV has a predilection for lymphoepithelial structures in certain anatomic regions, especially the tonsils and Waldeyer ring. 19 Begum et al. showed that detection of HPV-16 in metastatic cervical lymph nodes is correlated with an oropharyngeal origin. 25 The biologic behavior of HPV-positive HNSCCs is subject to debate. In the study by Paz et al., patients who had HPV-positive tumors presented with later stage disease compared with patients who had HPVnegative tumors. 26 Although HPV-positive tumors seem to spread more rapidly than HPV-negative tumors, overall survival is almost the same or better than in patients with HPV-negative tumors. Moreover, Gillison et al. found that the risk of dying from disease was reduced (59%) in patients with HPV-positive HNSCC after correcting for age, metastasis, and alcohol consumption. 9 Although tobacco and alcohol are chemical agents that contact the upper aerodigestive mucosa directly, the mechanism by which this mucosatrophic carcinogenetic virus infects the mucosa of the upper aerodigestive track has not been well established. Some studies demonstrated a significant correlation between a sexual behavior, such as young age of activity and multiple sexual partners; the risk is independent of tobacco products and alcohol use. 27,28 In addition, it was found that HPV infection of the oral region was rare in preadolescent children prior to sexual debut. 29 FIGURE 3. Using in situ hybridization, human papillomavirus DNA was detected in this sample of metastatic head and neck squamous cell carcinoma as black dots in the nuclei of tumor cells. The signal, which is represented as dotlike punctuation, is not present outside the nuclear membrane or background.
6 176 CANCER (CANCER CYTOPATHOLOGY) June 25, 2005 / Volume 105 / Number 3 FIGURE 4. The dot-like products in the nuclei of this metastatic head and neck squamous cell carcinoma represent viral integration. The signal intensity varies from one inconspicuous dot to many conspicuous dots in a single tumor nucleus. The number of dots is related to the viral load (see Samama et al., ). TABLE 3 The Origin of Metastatic Tumors and Human Papillomavirus DNA Detection Origin HPV DNA status: No. of tumors (%) Positive Nasopharyngeal 1 (17) 5 Laryngeal 2 (22) 7 Oral cavity 1 (19) 10 Total 4 (15) 22 HPV: human papillomavirus. TABLE 4 Cytologic Grade and Human Papillomavirus Status in Metastatic Head and Neck Squamous Cell Carcinoma a Cytologic grade Positive HPV status: No. of tumors Nonkeratinizing 4 9 Keratinizing 0 13 Total 4 22 HPV: human papillomavirus. a P 0.04 (Fisher exact test). Negative Negative In conclusion, we demonstrated the presence of HPV in metastatic lesions of HNSCC. We also showed that HPV DNA-containing tumors have distinctively nonkeratinizing cytologic features and alcohol-fixed archival cytologic material can be used for HPV DNA detection by ISH. REFERENCES 1. Kim BS, Kies M, Herbs RS. Novel therapeutics for head and neck cancer. Curr Opin Oncol. 2002;14: Sessions RB, Picken CA. Malignant cervical lymphadenopathy. In: Cummings CW, Fredrickson JM, Harker LA, et al., editors. Otolaryngology: head and neck surgery, 3rd edition. New York: Mosby-Year Book, Inc., 1998: Blot WJ, Mclaughlin JK, Winn DM, et al. Smoking and drinking in relation to oral and pharyngeal cancer. Cancer Res. 1988;48: La Vecchia CTA, Franceschi S, Levi F, et al. Epidemiology and prevention of oral cancer. Oral Oncol. 1997;33: Vokes EE, Weicshelbaum RR, Lippman SM, et al. Head and neck cancer. N Engl J Med. 1993;328: Loning,T, Ikenberg H, Becker J, et al. Analysis of oral papillomas, leukoplakias invasive carcinomas for human papillomavirus type related DNA. J Invest Dermatol. 1985;84: McKaig RG, Baric RS, Olshan AF. Human papillomavirus and head and neck cancer: epidemiology and molecular biology. Head Neck. 1998;20: Badarocci G, Venuti A, Morello R, et al. Human papillomavirus in head and neck carcinomas: prevalence, physical status, and relationship to clinical/pathological parameters. Anticancer Res. 2000;20: Gillison ML, Koch WM, Capone RB, et al. Evidence for a casual association between human papillomavirus and a subset of head and neck cancers. J Natl Cancer Inst. 2000; 92: Samama B, Plas-Roser S, Schaffer C, et al. HPV DNA detection by in situ hybridization with catalyzed signal amplification on thin layer cervical smears. J Histochem Cytochem. 2002;50:
7 Human Papillomavirus DNA in HNSCC/Umudum et al Forestiere A, Koch W, Trotti A, et al. Head and neck cancer. N Engl J Med. 2001;345: Mork J, Lie AK, Glattre E, et al. Human papillomavirus infection as risk factor for squamous cell carcinoma of head and neck. N Engl J Med. 2001;344: Ha PK, Pai SI, Westra WH, et al. Real time quantitative PCR demonstrates low prevalence of HPV type 16 in premalignant and malignant lesions of oral cavity. Clin Cancer Res. 2002;8: van Houten VM, Snijders PJ, van den Brekel MW, et al. Biological evidence that human papillomavirus are etiologically involved in a subgroup of head and neck squamous cell carcinomas. Int J Cancer. 2001;93: Trimble CL, Hildesheim A, Brinton LA, Shah KV, Kurman RJ. Heterogeneous etiology of squamous cell carcinoma of the vulva. Obstet Gynecol. 1996;87: El-Mofty SK, Lu DW. Prevalence of human papillomavirus type 16 DNA in squamous cell carcinoma of the palatine tonsil, and not the oral cavity, in young patients: a distinct clinicopathologic and molecular disease entity. Am J Surg Pathol. 2003;27: Williams GR, Lu QL, Love SB, Talbot IC, Northover JM. Properties of HPV-positive and HPV-negative anal carcinomas. J Pathol. 1996;180: Cubilla AL, Reuter VE, Gregoire L, et al. Basaloid squamous cell carcinoma: a distinctive human papillomavirus-related penile neoplasm. Am J Surg Pathol. 1998;22: Wilczynski SP, Lin B, Xie Y, Paz IB. Detection of human papillomavirus DNA and oncoprotein overexpression are associated with distinct morphological patterns of tonsillar squamous cell carcinoma. Am J Pathol. 1998;152: Hubbard RA. Human papillomavirus testing methods. Arch Pathol Med. 2003;127: Victor T, Jordaan A, du Toit R, van Helden PD. Laboratory experience and guidelines for avoiding false positive polymerase chain reaction. Eur J Clin Chem Clin Biochem. 1993; 31: Delvenne P, Fontaine M, Delvenne C, et al. Detection of human papillomaviruses in paraffin embedded biopsies of cervical intraepithelial lesions: analysis by immunohistochemistry, in situ hybridization and polymerase chain reaction. Mod Pathol. 1994;7: Lie AK, Skjeldestad FE, Hagen B, et al. Comparison of light microscopy, in situ hybridization and polymerase chain reaction of human papillomavirus in histological tissue of cervical intraepithelial neoplasia. APMIS. 1997;105: Nitta H, Abruzzesse R, Coleman M, et al. Visualization of transfected plasmid DNA by in situ hybridization using biotin labeled plasmid DNA backbone fragment probes and tyramide signal amplification. Cell Vision. 1997;5: Begum S, Gillison ML, Ansari-Lari MA, et al. Detection of human papillomavirus in cervical lymph nodes: a highly effective strategy for localizing site of tumor origin. Clin Cancer Res. 2003;9: Paz IB, Cook N, Odom-Maryon T, Xie Y, Wilcynski SP. Human papillomavirus in head and neck cancer. An association of HPV 16 with squamous cell carcinoma of Waldereyers tonsillar ring. Cancer. 1997;79: Schwartz SM, Daling JR, Doody DR, et al. Oral cancer risk in relation to sexual history and evidence of human papillomavirus infection. J Natl Cancer Inst. 1998;90: Smith EM, Hoffman HT, Summersgill KS, et al. Human papillomavirus and risk of oral cancer. Laryngoscope. 1998; 108: Koch A, Hansen SV, Nielsen NM, et al. HPV detection in children prior to sexual debut. Int J Cancer. 1997;73:
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