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We describe the accidental transplantation of a malignant sarcoma from a patient to a surgeon. Using molecular methods, we showed that the sarcomas in the unrelated patient and surgeon were genetically identical.
Case Report
A 32-year-old man underwent emergency surgery to remove a malignant fibrous histiocytoma from his abdomen and died shortly thereafter of postoperative complications. During the operation the 53-year-old surgeon injured the palm of his left hand while placing a drain. The lesion was immediately disinfected and dressed. Five months later, the surgeon consulted a hand specialist because of a hard, circumscribed, tumor-like swelling, 3.0 cm (1.2 in.) in diameter, in his left palm at the base of the middle finger, where he had been injured during the operation. An extensive examination, including laboratory tests, did not reveal any signs of immune deficiency. The tumor was completely excised. Histologic examination revealed that it was a malignant fibrous histiocytoma. Two years later, the surgeon's condition was good, and there was no evidence of recurrence or metastasis of the tumor.
The pathologist who investigated both the patient's tumor and the surgeon's tumor raised the question whether the tumors were identical.
Methods
Histologic and Immunohistologic Analysis
Samples of tumor tissue from the patient and surgeon were embedded in paraffin and stained with hematoxylin and eosin, periodic acid–Schiff, and van Gieson's stain. Immunostaining was performed with the avidin–biotin–peroxidase method, with antibodies against vimentin, lysozyme, alpha1-antitrypsin, alpha1-antichymotrypsin, keratin, endomysial antigens, S100, actin, and desmin (all antibodies were obtained from Dako, Glestrup, Denmark).
Isolation of DNA
Genomic DNA from peripheral-blood samples was isolated by the "salting-out" method.6 DNA from paraffin-embedded tumor and tissue samples was extracted according to a modification7 of the method of Goelz et al.8
Analysis of Short Tandem-Repeat Polymorphisms
Short tandem-repeat polymorphisms of the loci HUMTH01, HUMCYAR04, and HUMACTBP2 were amplified by the polymerase chain reaction (PCR) with fluorescence-labeled primers. Primer sequences were chosen from published sequences.9,10,11 The 5' primer for HUMCYAR04 was labeled with 5-carboxylfluorescein, whereas the 5' primers for HUMTH01 and HUMACTBP2 were labeled with 6-carboxy-2',4',7',4,7-hexachlorofluorescein. PCR products were analyzed with an automated DNA sequencer (model 373A, Applied Biosystem Division, Perkin-Elmer, Foster City, Calif.).
Sequence-Based Typing of HLA Genes
Typing of HLA-DRB1 and DQB1 alleles was performed by allele-specific PCR amplification in combination with solid-phase direct DNA sequencing. Sequence analysis was performed on an automated DNA sequencer (model 373A, Perkin-Elmer). Primer sequences were chosen from genomic sequences of HLA-DRB1 and DQB112 or from published sequences.13
Results
Histologic analysis of tumor tissues from the surgeon and the patient revealed that they were morphologically identical. Both tumors were malignant fibrous histiocytomas of the storiform–pleomorphic subtype (Figure 1A). They consisted mainly of fibroblast-like and histiocyte-like cells, arranged in a fascicular and storiform pattern, intermingled with some pleomorphic cells and a few inflammatory cells. There were numerous mitotic figures and many necrotic areas. In the periphery of the surgeon's tumor, there was intense inflammation, with an infiltrate consisting mainly of lymphocytes and macrophages and few plasma cells (Figure 1B). Both tumors stained for vimentin, alpha1-antitrypsin, and alpha1-antichymotrypsin.
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Discussion
We used histologic and immunohistologic methods, analysis of short tandem-repeat polymorphisms, and sequence-based typing of HLA genes to determine the genetic origin of a sarcoma that had been accidentally transplanted from a patient to a surgeon. Both the pattern of short tandem-repeat sequences and the chimeric constellation of HLA alleles in the surgeon's tumor identified the genetic origin of the sarcoma. The patient and the surgeon had different HLA haplotypes, with complete discrepancies of DRB1 and DQB1 alleles. The patient died before we could perform HLA class I typing, but from the linkage disequilibrium between HLA genes we can assume that there were also major class I mismatches between the patient and the surgeon.
Normally, transplantation of allogeneic tissue from one person to another induces an immune response that leads to the rejection of the transplanted tissue.1,14,15,16,17 In the case of the surgeon, an intense inflammatory reaction developed in the tissue surrounding the tumor, but the tumor mass increased, suggesting an ineffective antitumor immune response. The tumor may have escaped immunologic destruction through several mechanisms, such as qualitative and quantitative changes of major histocompatibility complex class I molecules on the tumor cells, an absence of immunogenic tumor antigens,18,19,20,21,22 deficient antigen processing by the tumor, or deficient presentation of tumor antigens by the host's antigen-presenting cells in the absence of costimulatory signals with consequent T-cell and B-cell anergy.23,24,25
We are indebted to Dr. Hans Georg Rammensee for his critical review of the manuscript and to Utz Bacher for his excellent secretarial assistance.
Source Information
From the Institutes of Pathology (H.-V.G., B.B.) and Anthropology and Human Genetics (C.L., H.R.), Eberhard-Karls-Universität, Tübingen; the Institute of Transfusion Medicine and Immunohematology, Red Cross Blood Donor Service, Frankfurt am Main (C.S., E.S.); and the Institute of Pathology, General Hospital, Heilbronn (G.S.) — all in Germany.
Address reprint requests to Dr. Gärtner at the Institute of Pathology, Eberhard-Karls-Universität, Liebermeisterstraße 8, D-72076 Tübingen, Germany.
References
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