Serological response to human endogenous retrovirus K in melanoma patients correlates with survival probability.
A few years ago, reactivation of human endogenous retrovirus K (HERV-K) proviruses in melanoma was described. The expression of HERV-K proteins induces humoral immune responses. The aim of the present study was to elucidate the prognostic relevance of serological anti-HERV-K reactivity in melanoma patients. In a retrospective study, anti-HERV-K Gag and Env antibodies were detected in 51 of the 312 randomly selected and blinded sera from melanoma patients, but not in any of the 70 sera from healthy controls. Comparing serological HERV-K reactivity with established melanoma markers revealed a significant correlation (p = 0.018, Chi-square test) with the stage of disease classified according to the American Joint Committee on Cancer (AJCC). Anti-HERV-K reactivity was elevated in patients with acrolentiginous/mucosal/uveal melanoma (tumor subtypes developing at sun-protected sites) compared to patients with lentigo/nodular/superficial spreading melanoma (p = 0.011, Chi-square test). Patients with anti-HERV-K antibodies had a significantly decreased disease-specific overall survival (stage I-IV, p < 0.001; stage I-III, p = 0.005, log-rank test). Significantly, multivariate Cox regression analysis including prognostic markers in clinical use (e.g., AJCC stage, T-class, serum level of S100-beta) revealed serological HERV-K reactivity as an independent marker of reduced survival probability (p = 0.027) in melanoma patients with the early stages of the disease (AJCC I-III). This is the first report that the humoral anti-HERV-K immune response may provide additional prognostic information to that of established melanoma markers.
Hahn
Silvia
S
Retroelement Section, Paul-Ehrlich-Institut, Langen, Germany.
Ugurel
Selma
S
Hanschmann
Kay-Martin
KM
Strobel
Heike
H
Tondera
Christiane
C
Schadendorf
Dirk
D
Löwer
Johannes
J
Löwer
Roswitha
R
D000328:Adult; D000368:Aged; D000914:Antibodies, Viral / Q000097:blood*; D015415:Biomarkers / Q000097:blood; D020077:Endogenous Retroviruses / Q000276:immunology*; D005260:Female; D015683:Gene Products, gag / Q000276:immunology; D006801:Humans; D008297:Male; D008545:Melanoma / Q000097:blood* / Q000175:diagnosis*; D008875:Middle Aged; D009367:Neoplasm Staging; D009414:Nerve Growth Factors / Q000097:blood; D011336:Probability; D011379:Prognosis; D012189:Retrospective Studies; D064568:S100 Calcium Binding Protein beta Subunit; D009418:S100 Proteins / Q000097:blood; D012878:Skin Neoplasms / Q000097:blood* / Q000175:diagnosis*; D014604:Uveal Neoplasms / Q000097:blood* / Q000175:diagnosis*; D014759:Viral Envelope Proteins / Q000276:immunology
D000914:Antibodies, Viral; D015415:Biomarkers; D015683:Gene Products, gag; D009414:Nerve Growth Factors; D064568:S100 Calcium Binding Protein beta Subunit; D009418:S100 Proteins; C579160:S100B protein, human; D014759:Viral Envelope Proteins