High-dose interferon alfa-2b does not diminish antibody response to GM2 vaccination in patients with resected melanoma: results of the Multicenter Eastern Cooperative Oncology Group Phase II Trial E2696.
OBJECTIVE
High-dose interferon alfa-2b (IFNalpha2b) is the only established adjuvant therapy of resectable high-risk melanoma. GM2-KLH/QS-21 (GMK) is a chemically defined vaccine that is one of the best developed of a range of vaccine candidates for melanoma. A single-institution phase III trial conducted at Memorial Hospital served as the impetus for an intergroup adjuvant E1694/S9512/C509801 trial, which recently completed enrollment of 880 patients. To build on the apparent benefit of IFNalpha2b in resectable high-risk American Joint Committee on Cancer (AJCC) stage IIB or III melanoma, this phase II study was designed to evaluate the combination of GMK and IFNalpha2b. The E2696 trial was undertaken to evaluate the toxicity and other effects of the established adjuvant high-dose IFNalpha2b regimen in relation to immune responses to GMK and to evaluate the potential clinical and immunologic effects of the combined therapies.


METHODS
This trial enrolled 107 patients with resectable high- or very high-risk melanoma (AJCC stages IIB, III, and IV).


RESULTS
The results demonstrate that IFNalpha2b does not significantly inhibit immunoglobulin M or G serologic responses to the vaccine and that the combination of high-dose IFNalpha2b and GMK is well tolerated in this patient population.


CONCLUSIONS
Cox analysis of the results of the combination with IFNalpha2b show improvement in the relapse-free survival of patients with very high-risk melanoma (including those with resectable M1 disease).
University of Pittsburgh Medical Center, University of Pittsburgh Cancer Institute Melanoma Center, Department of Medicine, Division of Hematology-Oncology, Pittsburgh, PA, USA. jmk@jimmy.harvard.edu
J M
JM
Kirkwood
J
J
Ibrahim
D H
DH
Lawson
M B
MB
Atkins
S S
SS
Agarwala
K
K
Collins
R
R
Mascari
D M
DM
Morrissey
P B
PB
Chapman
D000328:Adult; D000917:Antibody Formation; D000970:Antineoplastic Agents / Q000009:adverse effects / Q000276:immunology / Q000494:pharmacology*; D019496:Cancer Vaccines / Q000276:immunology*; D017024:Chemotherapy, Adjuvant; D003131:Combined Modality Therapy; D018572:Disease-Free Survival; D005260:Female; D005678:G(M2) Ganglioside / Q000494:pharmacology / Q000627:therapeutic use*; D006801:Humans; D000077190:Interferon alpha-2; D016898:Interferon-alpha / Q000009:adverse effects / Q000276:immunology / Q000494:pharmacology*; D008297:Male; D008545:Melanoma / Q000188:drug therapy / Q000276:immunology*; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local; D011994:Recombinant Proteins; D012307:Risk Factors; D012878:Skin Neoplasms / Q000188:drug therapy / Q000276:immunology*
D000970:Antineoplastic Agents; D019496:Cancer Vaccines; D000077190:Interferon alpha-2; D016898:Interferon-alpha; D011994:Recombinant Proteins; D005678:G(M2) Ganglioside