Ординатура / Офтальмология / Английские материалы / Primary Intraocular Lymphoma_Chan, Gonzales_2007
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124 Primary Intraocular Lymphoma
arthritis,71 inflammatory bowel disease,72 and multiple sclerosis.73 Evidence also exists on the involvement of chemokines and their receptors in cancer, including breast cancer metastasis,74 chronic lymphocytic leukemia,75 and B-cell NHL.76
Two chemokines involved in B-cell chemoattraction include CXCL12 (also known as SDF-1 (stromal derived factor-1, which binds to CXCR4 receptor on B-cells)) and CXCL13 (also known as BCA-1/BLC (B-cell specific chemokine, which binds to CXCR5 receptor on B-cells)). The interaction of CXCL13 with its receptor, CXCR5 on B-cells is necessary for the formation of germinal centers77 and for the germinal center B-cells to undergo somatic hypermutation and subsequent affinity maturation. After activation, these B-cells seem to become more responsive to CXCL12, thereby chemoattracting the B-cells out of the germinal center as these B-cells also express the receptor for CXCL12, CXCR4.
As the CNS, including the eye, is an immunologically privileged site, it remains an enigma as to why a lymphoma should involve this location. Chemokines and their receptors might provide some insights into the pathogenesis of PCNSL/PIOL. The expression of chemokine receptors on various tumor cells has been shown to be involved in their localization to certain sites.74,78 Similarly, chemokines have been shown to be involved in PCNSL and PIOL. At the NEI, we have shown that B-cell-attractive chemokines are expressed in the retinal tissues of patients with PIOL.79 Tissue provided from two enucleated eyes and one chorioretinal biopsy, all containing PIOL, and one normal autopsy eye were analyzed. Microdissection was performed on frozen sections of the ocular tissues to obtain either PIOL cells or retinal pigment epithelium (RPE). Reverse transcriptase (RT)-PCR was performed on the extracted RNA for PIOL cells as well as RPE cells that were adjacent to the PIOL cells and RPE cells that were located away from the tumor. PIOL cells were shown to express both B-cell chemokine receptors, CXCR5 and CXCR4, while adjacent RPE cells expressed CXCL13 and CXCL12. RPE tissue distant from tumor invasion also showed expression of CXCL13 mRNA that was more abundant than tumor-adjacent RPE tissue; distant RPE did not express mRNA for CXCL12. The more abundant expression of mRNA by distant RPE cells was of interest to us and could possibly be explained by three mechanisms. First, there could be downregulation of CXCL12 and CXCL13 in the
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tumor-adjacent RPE cells, perhaps after interaction with their respective chemokine receptors on the infiltrating lymphoma cells. Second, RPE cells adjacent to tumor are damaged or destroyed, while more distant RPE is intact. Finally, reactive inflammatory cells (T lymphocytes and macrophages) can also be admixed in the area of tumor infiltration. The RPE from the normal autopsy eye did not show mRNA expression of either CXCL12 or CXCL13. Therefore, deviant expression of chemokines by PIOL-susceptible RPE could be a means for the recruitment of malignant B-cells as well as their infiltration of areas with increased expression of such chemokines.
In a study of biopsy specimens from 24 patients with PCNSL (17 HIVnegative, three HIV-positive, and four with unknown HIV status), immunostaining for CXCL13 revealed that all the samples were positive for expression of the chemokine.80 Double immunostaining for CD20 (B- cell antigen) and CD31 (vascular endothelial antigen) on five biopsy specimens revealed that CXCL13 was expressed by the lymphoma and the vascular endothelial cells. There was no staining of normal, non-infiltrated brain tissue. Furthermore, immunostaining for CXCR5, CXCL13’s receptor, resulted in staining of the membranes of the lymphoma cells. More recently, Jahnke and colleagues showed that in 29 biopsy specimens from PCNSL patients, CXCR4, CXCR5, and CCR7 were expressed only in the cytoplasm or nucleus, but not on the membrane of lymphoma cells.81 This was in contrast to lymphoma cells from peripheral-NHL biopsy specimens. These data could offer an explanation as to why PCNSL so rarely metastasizes.
There is a complex interaction between cells, their receptors, and signals (interleukins and chemokines), and this is involved not only in the homing of lymphomas to specific sites in the CNS (both cerebral and ocular), but also in their restriction to these sites and lack of metastasis. Although we do not understand precisely how chemokine and cytokine profiles are involved in the pathogenesis of all PCNSL/PIOLs, we are making progress in elucidating some of the mechanisms by which PIOL is able to make its home in the eye. We are currently examining murine PIOL models82 (see Chapter 13 – Animal Models of PIOL). Furthermore, we can attempt to interfere with these mechanisms to direct future therapeutic interventions.
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Chapter 9
Diagnostic Approaches
We have already examined the clinical features found in PIOL as well as the imaging techniques that can be employed to help the ophthalmologist and oncologist to pursue a diagnosis of PIOL. While a strong clinical suspicion may exist that a patient has PIOL and a clinical examination helps confirm this suspicion, PIOL can be diagnosed only upon the identification of malignant lymphoid cells in the eye. In this chapter we explore the diagnostic approaches, both historical and current, for PIOL.
Historical Diagnostic Approaches
Early Analyses of the CSF in Malignancy. In 1904, Dufour was the first to describe the evaluation of cerebrospinal fluid (CSF) in malignancy.1 A 64-year-old male had presented with complaints of weakness in the legs, difficulty in urinating, cachexia, and memory difficulties. The right eye became red as in conjunctivitis and the cornea turned cloudy. The patient received lumbar puncture twice and each time showed yellow CSF with lymphocytosis and fibrin material. When the patient succumbed to his condition, massive infiltration of the spinal cord and roots as well as invasion of the marrow, consistent with a sarcoma, were found at autopsy. Subsequently, others began to value the utility of CSF examination in CNS malignancies, whether primary or secondary.
Marks and Marrack described 17 cases of CSF examinations revealing “abnormal cells, considered to be neoplastic.”2 None of the patients described by Marks and Marrack had PCNSL/PIOL or, as it would have been known during the 1960s, reticulum cell sarcoma. Three patients had histologically proven astrocytomas, two had histologically proven medulloblastomas (one questionably), six had metastatic cancer to the CNS, and
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Diagnostic Approaches 133
four patients did not have biopsies performed, but two were noted to have suprasellar masses on air encephalography. Finally, one patient who had neoplastic-appearing cells within the CSF was determined to have nonspecific leptomeningitis, and this case’s CSF examination was considered a false positive. Marks and Marrack conceded that while it was possible in suspected cases of CNS malignancy to identify cells suspicious of being neoplastic, “it is impossible, as yet, always to recognize the smeared cells as neoplastic by the methods currently employed.”2 Indeed, even today when we are “lucky” enough to get well-preserved cells in the CSF, there can be some difficulty in determining whether they are truly neoplastic. Difficulty arises from cells that are suggestively, but perhaps not blatantly, atypical.
In another rather large study of the CSF, Kline examined 1,669 CSF specimens.3 Histologically proven CNS tumors occurred in 96 cases, and 39 (41%) of these exhibited neoplastic cells in the CSF. Metastatic carcinomas and astrocytomas (including glioblastoma multiforme) made up the bulk of the histologically proven cases. There were three cases of Hodgkin’s lymphoma involving the CNS, but none of these exhibited neoplastic cells in their respective CSF samples. There were no cases of reticulum cell sarcoma in Kline’s study.
The issue of identifying neoplastic cells within the CSF was and still is of concern. However, some pathologists have noted that increasing cognizance amongst clinicians and pathologists of the fact that tumor cells could indeed be found in the CSF, could help uncover these cells more frequently.4
Enucleation. Prior to the development of pars plana vitrectomy (PPV) surgery in the 1970s, enucleation was the only way to establish a diagnosis of primary intraocular reticulum cell sarcoma (RCS), now known as PIOL.5–7 Indeed, enucleation provided unequivocal evidence of neoplastic processes by providing the pathologist with the whole eye and being able to make both macroscopic and microscopic observations of involved ocular tissues. Enucleation was often performed in patients whose eyes no longer had vision or were painful.5 Enucleation was also performed in patients who had died from their sarcomas (whether primarily or secondarily affecting the CNS) to confirm clinical suspicion of RCS.
The Vitreous: A Glimpse into the Eye. word vitre-us, meaning “of glass, glassy,
Vitreous comes from the Latin bright” to denote a nature or
