Distinguishing de Novo Second Cancer Formation from Tumor Recurrence

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Presentation transcript:

Distinguishing de Novo Second Cancer Formation from Tumor Recurrence Raj Rolston, Eizaburo Sasatomi, Jennifer Hunt, Patricia A. Swalsky, Sydney D. Finkelstein The Journal of Molecular Diagnostics Volume 3, Issue 4, Pages 129-132 (November 2001) DOI: 10.1016/S1525-1578(10)60663-0 Copyright © 2001 American Society for Investigative Pathology and Association for Molecular Pathology Terms and Conditions

Figure 1 Topographic microdissection. A: The primary colonic cancer has been sampled at the point of deepest invasion (arrow).B and C: A sample has also been obtained from a pericolonic lymph node metastasis subjacent to the same tumor seen at low power (B) and at high power (C). The metastatic tumor in this case was highly necrotic consisting only of a rim of viable tumor at the periphery. Thus microdissection took the form of a thin doughnut of viable tumor (arrow). Also note the minute amount of tissue required to enable detailed mutational profiling (third section has not been microdissected). A representative sample of non-neoplastic, normal appearing colonic mucosa has also been taken. In a similar fashion, the small intestinal tumor was microdissected to provide representative material for mutational fingerprinting. The Journal of Molecular Diagnostics 2001 3, 129-132DOI: (10.1016/S1525-1578(10)60663-0) Copyright © 2001 American Society for Investigative Pathology and Association for Molecular Pathology Terms and Conditions

Figure 2 Allelic imbalance analysis. Capillary electrophoresis of fluorescent labeled microsatellite PCR products. The criteria for conservative threshold determination of allelic loss was defined as a ratio between informative allelic band heights of less than 0.5 or greater than 2.0 (positive allelic loss). Note the presence of two near equivalent allelic peak heights in the normal microdissected tissue sample indicating both informativeness for the particular marker and the presence of a balanced PCR reaction without artificial induction of allelic loss. An example of a non-informative marker is shown. Note that multiple samples may be run simultaneously for multiplex analysis. The Journal of Molecular Diagnostics 2001 3, 129-132DOI: (10.1016/S1525-1578(10)60663-0) Copyright © 2001 American Society for Investigative Pathology and Association for Molecular Pathology Terms and Conditions

Figure 3 Microdissection genotyping. I: informative; NI: noninformative; NO LOH: no loss of heterozygosity (allelic balance); LOH: allelic loss. Initial allelic loss alteration is indicated in dark gray, second allelic loss event involving the same microsatellite is indicated in the four light gray boxes. The Journal of Molecular Diagnostics 2001 3, 129-132DOI: (10.1016/S1525-1578(10)60663-0) Copyright © 2001 American Society for Investigative Pathology and Association for Molecular Pathology Terms and Conditions

Figure 4 Temporal acquisition of mutational change. Initial shared allelic loss alterations are seen in both the primary colon cancer and lymph node metastasis. Metastatic seeding occurring at that time led to the accumulation of new allelic loss alterations in the lymph node metastasis which affected the same alleles subsequently altered in the primary colon cancer. The small intestinal tumor occurring five years later showed nine allelic loss alterations identical to that seen in the lymph node metastasis and one additional, new allelic loss. The Journal of Molecular Diagnostics 2001 3, 129-132DOI: (10.1016/S1525-1578(10)60663-0) Copyright © 2001 American Society for Investigative Pathology and Association for Molecular Pathology Terms and Conditions