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High Resolution Anoscopy in the Planned Staged Treatment of Anal Squamous Intraepithelial Lesions in HIV-Negative Patients

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Journal of Gastrointestinal Surgery Aims and scope

Abstract

Anal dysplasia (low-grade squamous intraepithelial lesions, LSIL; high-grade squamous intraepithelial lesions, HSIL) is a challenging disease for the surgeon. We reviewed 42 patients that underwent high-resolution anoscopy (HRA)-targeted surgical therapy of anal dysplasia in the past 10 years. Patients were followed up in the Anal Neoplasia Clinic with physical examination, cytology, HRA, and biopsy if indicated. Patients with disease amenable to local therapy were treated with office-based HRA-directed therapies. There were 30 men (mean age 39 years, range 21–63) and 12 women (mean age 50 years, range 31–71) included in the study. HSIL was present in 33, with four undergoing planned staged treatment due to circumferential disease. HSIL recurred in 45%, and most were re-treated successfully in-office. Progression to HSIL was seen in one patient with LSIL and to squamous cell carcinoma in one patient with HSIL despite therapy. No patients with LSIL had dysplasia at last follow-up. Minor complications occurred in three patients. HRA-targeted surgical therapy coupled with surveillance and re-treatment with office-based therapies offered an effective method in controlling anal dysplasia in the immunocompetent patient. Morbidity is minimal, and our progression to cancer rate is low (2.4%).

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Correspondence to Carlos E. Pineda.

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Discussion

John H. Pemberton, M.D. (Rochester, MN): The authors must be congratulated for trying to sort out this particularly difficult neoplastic lesion. It seems like it has been confusing for just about forever. Historically, at least in the Midwest, we have seen patients with large areas of erythematous perianal skin, which, when biopsied, was positive for in situ squamous cell cancer. This was termed Bowen’s disease, and these areas were widely excised. Clearly, this approach does not seem appropriate for patients with discontinuous disease such as those described by you today. This problem is so rare that few people, with the exception of these authors, have extensive experience with it. It is indeed difficult to characterize and categorize.

Perhaps we should think of factors that might influence approaches to treatment, such as HIV positive or negative; HPV positive or negative; location (perianal or anal canal); and distribution of the process (continuous or discontinuous). Therefore, I wish to ask four questions.

First, would it be useful to include distribution of disease, the location, and its distribution as an additional way of categorizing patients in order to determine an accurate and acceptable treatment plan? Second, is it reasonable to assume, for those of us who are a little older, that Bowen’s disease and AIN2 and 3 are the same? Third, what is the role of HPV testing in these patients? And finally, you did not mention it, but I would be interested to know your take on the role of Aldara in the management of either discontinuous or continuous disease in order to prevent our patients from having to have those complicated flaps that you illustrated.

I wish to thank you again for sending the manuscript and for a great presentation.

Carlos E. Pineda, M.D. (Stanford, CA): Regarding the distribution and categorization of disease, we think it is very important that clinicians try to specify where the lesions are located. Our group encourages the use of standardized, simple terminology in order to facilitate communication among clinicians, using intra anal, perianal and skin to define disease location. When planning therapy, it is important to note that disease can occur above the dentate line. Disease in this location is not evaluated with the standard mapping procedures for “Bowen’s disease” using punch biopsies.

Anal squamous high-grade intraepithelial lesions (HSIL), anal intraepithelial neoplasia II/III (AIN), Bowen’s disease, and squamous cell carcinoma in situ are different names for the same disease. Training in histopathology, cytopathology, or dermatopathology lead to the different word choices, but all refer to the same pathologic process.

The role of HPV testing at this moment is unclear. In the future, microarray technology may allow us to analyze which subsets of HPV 16 and 18 will progress to invasive disease.

We have seen mixed results with the use of Aldara. Some patients respond dramatically and clear all disease. However, the majority of patients do not respond as well and require further therapy.

Dr. Pemberton: Is there anything to characterize those that don’t respond? How do they differ from those that do?

Dr. Pineda: We have not had personal experience that allows us to predict treatment success. Some feel that the more keratinized lesions are slower to respond and the clinician should persist in their treatment despite apparent lack of response.

Michael J. Stamos, M.D. (Orange, CA): I really enjoyed your talk today and think this is a great addition to the literature, particularly in that group of immunocompetent patients who we are faced with on a regular basis that have this problem. A few questions.

First question is, how many of your patients had visible disease? I mean, these are not patients you are screening because they are not high risk. So if these are patients with visible disease, I think the idea that anybody recommends watchful waiting is a little bit off, because most people who recommend watchful waiting do so in patients who have no visible disease. So the first question is, how many patients had visible disease versus no apparent disease?

The second question is, do you have any information on progression in those two groups, because I think that is another separate sub categorization that is very important for us to have to know whether we need to have this kind of procedure done on patients who have no visible disease, i.e., they underwent a hemorrhoidectomy and in the specimen they found some AIN.

And then finally, you had one patient who you said progressed to squamous cell carcinoma. Are you certain that she progressed and/or was she just delayed in diagnosis because she had this complicating factor and you didn’t biopsy the correct area early on but only after subsequent staged procedures?

Thank you.

Dr. Pineda: We did not track which patients had visible disease at initial evaluation, as it predominantly represents condylomatous disease caused by HPV 6 and 11. We can say that the vast majority of HSIL were not visible without the use of an operating microscope and acetic acid.

The woman who progressed to anal squamous cell carcinoma had undergone four operations over a 53 month period for recurrent HSIL in the posterior midline. During each of these procedures she was evaluated by an experienced colorectal surgeon (senior author) with a digital rectal exam, as well as high resolution anoscopy. During the fifth procedure she was noted to have an indurated lesion in the same location, we therefore conclude that this represents progression.

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Pineda, C.E., Berry, J.M., Jay, N. et al. High Resolution Anoscopy in the Planned Staged Treatment of Anal Squamous Intraepithelial Lesions in HIV-Negative Patients. J Gastrointest Surg 11, 1410–1416 (2007). https://doi.org/10.1007/s11605-007-0262-4

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  • DOI: https://doi.org/10.1007/s11605-007-0262-4

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