SUMMARY We describe the landscape of genomic alterations in cutaneous melanomas through DNA, RNA, and protein-based analysis of 333 primary and/or metastatic melanomas from 331 patients. We establish a framework for genomic classification into one of four subtypes based on the pattern of the most prevalent significantly mutated genes: mutant BRAF, mutant RAS, mutant NF1, and Triple-WT (wild-type). Integrative analysis reveals enrichment of KIT mutations and focal amplifications and complex structural rearrangements as a feature of the Triple-WT subtype. We found no significant outcome correlation with genomic classification, but samples assigned a transcriptomic subclass enriched for immune gene expression associated with lymphocyte infiltrate on pathology review and high LCK protein expression, a T cell marker, were associated with improved patient survival. This clinicopathological and multidimensional analysis suggests that the prognosis of melanoma patients with regional metastases is influenced by tumor stroma immunobiology, offering insights to further personalize therapeutic decision-making.

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Ebola virus (EBOV) entry requires the surface glycoprotein, GP, to initiate attachment and fusion of viral and host membranes. Here, we report the crystal structure of EBOV GP in its trimeric, prefusion conformation (GP1+GP2) bound to a neutralizing antibody, KZ52, derived from a human survivor of the 1995 Kikwit outbreak. Three GP1 viral attachment subunits assemble to form a chalice, cradled by the GP2 fusion subunits, while a novel glycan cap and projected mucin-like domain restrict access to the conserved receptor-binding site sequestered in the chalice bowl. The glycocalyx surrounding GP is likely central to immune evasion and may explain why survivors have insignificant neutralizing antibody titres. KZ52 recognizes a protein epitope at the chalice base where it clamps several regions of the pre-fusion GP2 to the N terminus of GP1. This structure now provides a template for unraveling the mechanism of EBOV GP-mediated fusion and for future immunotherapeutic development.The Ebola virus (EBOV) is an enveloped, non-segmented, negative-strand RNA virus, which together with Marburg virus, makes up the filoviridae family. The virus causes severe hemorrhagic fever associated with 50-90% human mortality 1 . Four species of the virus (Zaire, Sudan, Côte d'Ivoire, and Reston ebolavirus) have thus far been identified, with Zaire typically associated with the highest human lethality 2 . A fifth EBOV species is confirmed in a 2007 outbreak in Bundibugyo, Uganda 3,4 . Infection with EBOV results in uncontrolled viral replication and multiple organ failure with death occurring 6-9 days after onset of symptoms 5 . Fatal cases are associated with high viremia and defective immune responses, while survival is associated with early and vigorous humoral and cellular immune responses 6-9 . Although preliminary vaccine trials in primates have been highly successful 10-13 , no vaccines, specific immunotherapeutics, or post-exposure treatments are currently approved for human use. Since 1994, EBOV outbreaks have increased more than four-fold, thus necessitating the urgent development of vaccines and therapeutics for use in the event of an intentional, accidental or natural EBOV release.The EBOV genome contains seven genes, which direct the synthesis of eight proteins. Ebola virus GP is in a pre-fusion conformationIn an effort to increase sample homogeneity and to promote crystal contacts, we excised the mucin-like and transmembrane domains (GP 33-632 Δmuc), mutated two N-linked glycosylation sites (T42V/T230V) and complexed the GP with Fab KZ52, which recognizes a conformational epitope. The resulting GP construct is fully capable of mediating virus entry and exhibits similar antibody neutralization profiles as wild-type, when expressed with a transmembrane domain on vesicular stomatitis virus (VSV) pseudovirions (Supplemental Methods and Fig. S1).The EBOV GP trimer contains three non-covalently attached monomers (A, B and C) (Supplemental Fig. S2), which together adopt a chalice-like shape with overall dimensions of ∼95 ...

Purpose: To compare the effect of pathologic sentinel lymph node (SLN) status with that of other known prognostic factors on recurrence and survival in patients with stage I or II cutaneous melanoma.Patients and Methods: We reviewed the records of 612 patients with primary cutaneous melanoma who underwent lymphatic mapping and SLN biopsy between January 1991 and May 1995 to determine the effects of tumor thickness, ulceration, Clark level, location, sex, and SLN pathologic status on disease-free and disease-specific survival.Results: In the 580 patients in whom lymphatic mapping and SLN biopsy were successful, the SLN was positive by conventional histology in 85 patients (15%) but negative in 495 patients (85%). SLN status was the most significant prognostic factor with respect to diseasefree and disease-specific survival by univariate and multiple covariate analyses. Although tumor thickness and ulceration influenced survival in SLN-negative patients, they provided no additional prognostic information in SLN-positive patients.Conclusion: Lymphatic mapping and SLN biopsy is highly accurate in staging nodal basins at risk for regional metastases in primary melanoma patients and identifies those who may benefit from earlier lymphadenectomy. Furthermore, pathologic status of the SLN in these patients with clinically negative nodes is the most important prognostic factor for recurrence. The information from SLN biopsy is particularly helpful in establishing stratification criteria for future adjuvant trials. J Clin Oncol 17:976-983.