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Allelic Imbalance of 12q22–23 Associated with APAF-1 Locus Correlates with Poor Disease Outcome in Cutaneous Melanoma

¹ Department of Molecular Oncology, ² Division of Surgical Oncology, John Wayne Cancer Institute, Saint John’s Health Center, Santa Monica, and ³ Department of Biomathematics, University of California Los Angeles, School of Medicine, Los Angeles, California

Cutaneous melanoma is a highly aggressive tumor that is relatively resistant to chemotherapy and radiotherapy. This resistance may be in part due to inhibition of apoptosis. Apoptotic protease activating factor-1(APAF-1), a candidate tumor suppressor gene, mediates p53-induced apoptosis, and its loss promotes oncogenic transformation. To determine whether loss of the APAF-1 locus influences tumor progression, we assessed loss of heterozygosity microsatellites on the APAF-1 locus (12q22–23) in 62 primary and 112 metastatic melanomas. We discovered that frequency of allelic imbalance was significantly higher in metastatic tumors (n = 36 of 98; 37%) than in primary melanomas (n = 10 of 54; 19%; P = 0.02). In metastatic melanomas, APAF-1 loss significantly correlated with a worse prognosis (P < 0.05) in the patients, and its loss during melanoma tumor progression suggests that APAF-1 is a tumor suppressor gene. Furthermore, loss of heterozygosity was frequent in the 12q22–23 chromosome region centromeric to the APAF-1 locus suggesting that other tumor-related genes may be present in the 12q22–23 region. In summary, the study demonstrates that allelic imbalance in the 12q22–23 region is a genomic surrogate of poor disease outcome for cutaneous melanoma patients.

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