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© 2003 American Society for Clinical Oncology Humoral Immune Response to a Therapeutic Polyvalent Cancer Vaccine After Complete Resection of Thick Primary Melanoma and Sentinel Lymphadenectomy
From the Sonya Valley Ghidossi Vaccine Laboratory of the Roy E. Coats Research Laboratories of the John Wayne Cancer Institute at Saint Johns Health Center, Santa Monica, CA. Address reprint requests to Donald L. Morton, MD, John Wayne Cancer Institute, 2200 Santa Monica Blvd, Santa Monica, CA 90404; email: mortond{at}jwci.org.
Purpose: A therapeutic polyvalent cancer vaccine (Canvaxin vaccine; CancerVax Corp, Carlsbad, CA) induces antibodies to a glycoprotein tumor-associated antigen (TA90). However, endogenous immune responses to TA90 have also been reported. This study examined anti-TA90 antibody responses with respect to the survival of patients who received adjuvant vaccine immunotherapy after resection of thick ( 4 mm) primary cutaneous melanoma. Patients and Methods: Serum specimens were obtained from 54 patients immediately before and then 1, 2, 4, and 6 months after wide local excision of thick primary cutaneous melanoma and sentinel lymphadenectomy. All patients were offered adjuvant therapies with the vaccine, high-dose interferon, or other agents. An enzyme-linked immunosorbent assay was used to determine serial serum titers of immunoglobulin G (IgG) and IgM antibodies against TA90. These titers were correlated with clinical course. Results: Forty-three patients chose vaccine therapy, and 11 patients chose postoperative observation. Preoperative anti-TA90 IgG and IgM titers were similar for vaccine and observation groups (P = .184). At a median follow-up of 26 months, univariate analysis of Cox regression showed that disease-free survival and overall survival of vaccine patients were significantly correlated with maximal IgM response (P = .0006 and .006, respectively) but not with maximal IgG response (P = .73 and .95, respectively). Neither response predicted survival in the observation group. Conclusion: Postoperative vaccine therapy may enhance IgG and IgM immune responses to TA90 after surgical resection, but only the IgM response is correlated with improved survival. These findings may become useful to guide selection of patients for postoperative adjuvant therapy of high-risk melanoma.
ALTHOUGH ADJUVANT therapy is often used after complete surgical resection of regional or distant metastatic melanoma, its administration after resection of high-risk primary melanoma is far from standard. Toxicity and questionable efficacy render many of the currently available chemotherapeutic and biochemotherapeutic regimens even less desirable in patients who have no clinical evidence of metastasis.1,2 Still, the generally high rates of recurrence for patients with thick primary cutaneous melanomas indicate the need for postoperative adjuvant therapy, particularly when the sentinel lymph node shows histologic evidence of regional metastasis.37
Active specific immunotherapy against melanoma has great appeal not only because melanoma is responsive to immune modulation, but also because cancer vaccines lack the toxicity of more conventional chemotherapeutic or biotherapeutic regimens.813 The vaccine developed at the John Wayne Cancer Institute (Canvaxin therapeutic polyvalent cancer vaccine; CancerVax Corp, Carlsbad, CA) is composed of three viable irradiated allogeneic melanoma cell lines that express high levels of immunogenic melanoma-associated and tumor-associated antigens (Table 1
Because this cancer vaccine has no direct cytotoxic effect on tumor cells, its therapeutic efficacy may depend on the ability of its tumor-associated and melanoma-associated antigens to induce immune responses against cross-reactive antigens on the patients residual melanoma cells after surgical resection.42 TA90, a 90-kDa glycoprotein tumor-associated antigen, is one such cross-reactive antigen that has been extensively studied.10,12 Immunization with the vaccine can elevate immunoglobulin G (IgG) and IgM antibody titers to TA90.10,12,14 However, an endogenous immune response to TA90 has also been demonstrated in patients who did not receive the vaccine.43 In that study of 64 patients undergoing complete resection of metastatic melanoma, elevated postoperative anti-TA90 IgM titers were significantly associated with improved overall survival (P = .0001).
This study was undertaken to determine whether adjuvant administration of Canvaxin therapeutic polyvalent cancer vaccine could increase the humoral immune response to TA90, and whether such an enhanced immune response would be correlated with improved survival after resection of thick (
Patient Population The patient population consisted of individuals who underwent treatment for primary cutaneous melanomas 4 mm thick at the John Wayne Cancer Institute between 1985 and 1999. Excluded were patients in whom complete physical examination and chest radiography revealed metastatic disease and patients who were lost to follow-up. All study patients underwent wide local excision of the primary tumor with at least a 2-cm margin. During the same procedure, lymphatic mapping and sentinel lymphadenectomy (LM-SL) was performed as previously described.44,45 Patients entering the study before 1992 underwent complete lymphadenectomy immediately after LM-SL, regardless of the tumor status of the sentinel node (SN), because LM-SL was still in its developmental stages. Patients entering the study after that time underwent complete lymphadenectomy only if the SN contained tumor. Because the study population represented a high-risk melanoma group, all patients were offered adjuvant therapy with Canvaxin therapeutic polyvalent cancer vaccine, high-dose interferon alfa, or other agents. All protocols for vaccine adjuvant therapy were in accordance with the ethical standards of the joint Saint Johns Health Center and John Wayne Cancer Institute institutional review board, in compliance with the Helsinki Declaration, and instituted only after the patients informed consent. The decision to receive adjuvant therapy and the selection of the type of adjuvant therapy rested with each patient. Each patients clinical status was recorded prospectively until the time of recurrence, death, or the end of the study period on October 30, 1999. Institutional review board approval was obtained for collection of serum samples before surgical resection and at 1, 2, 4, and 6 months after resection. These serum samples were processed, coded, and stored at -35°C until the time of analysis, at which point they were thawed and tested in a blinded fashion. The coded sample results were given to the statisticians for analysis and correlation with survival.
Vaccine Preparation and Administration
Anti-TA90 IgG and IgM Assay
Statistical Analysis
Patient characteristics are listed in Table 2
During follow-up, melanoma recurred in 10 (23%) of the 43 vaccine patients and seven (64%) of the 11 observation patients. Seven patients underwent complete resection of recurrent disease and were offered postoperative adjuvant therapy as described in Methods. These patients invariably chose vaccine therapy or observation; no patient elected adjuvant therapy with interferon. When vaccine therapy was restarted, the first dose of the vaccine was administered with a booster dose of bacille Calmette-Guerin. Four patients with recurrent disease had bulky hepatic metastases or other surgically inaccessible disease; these patients chose first-line treatment with biochemotherapy.47 The remaining six patients had unresectable brain metastases that required either whole-brain or gamma-knife irradiation. The median baseline anti-TA90 IgM titer was 1:100 (range, 1:100 to 1:800) for the entire cohort. As expected, baseline anti-TA90 IgM titers were similarly low in the vaccine and observation groups; 40 (93%) of 43 vaccine patients and nine (82%) of 11 observation patients had baseline IgM titers less than 1:800 (P = .7214). The range of increase for anti-TA90 IgM titers was 0 to 1:3,000 in the 54 patients. Anti-TA90 IgM antibody titers increased at least two-fold in 25 patients (46%) and at least four-fold in 19 patients (35%). Most of these elevations occurred in patients receiving vaccine; 25 vaccine patients (58%) but no observation patients had at least a four-fold increase in anti-TA90 titers. Furthermore, maximal anti-TA90 IgM titers were significantly greater in the vaccine group than in the observation group (P = .0022). The anti-TA90 IgG response followed a similar pattern. The median baseline anti-TA90 IgG titer was 1:200 (range, 1:100 to 1:2,400) for the entire cohort and was not significantly different between the two groups (P = .1843). Five (45%) of the 11 observation patients and 26 (60%) of the 43 vaccine patients had baseline IgG titers less than 1:400. The range of increase for anti-TA90 IgG titers was 0 to 1:2,400. Again, most of these increases occurred in the vaccine group; 20 vaccine patients (47%) but no observation patients had a four-fold increase in titer. However, maximal anti-TA90 IgG titers were not significantly different between the two groups (P = .1035).
A maximal anti-TA90 IgM titer
Neither a baseline anti-TA90 IgG titer less than 1:400 nor a maximal anti-TA90 IgG titer 1:400 correlated with improved DFS (Fig 3 1:400 (40% and 50%, respectively; P = .678). Although estimated 5-year OS was higher when anti-TA90 IgG was less than 400 versus 1:400, the difference was not significant (75% and 58%, respectively; P = .982).
Tables 3 1:800 was significant for DFS and OS (P = .001 and P = .003, respectively).
Table 5 1:800 had a significantly longer DFS (P = .041 and P = .0006, respectively) and OS (P = .032 and P = .006, respectively).
Because active specific immunotherapy is believed to improve survival by enhancing the patients immunity against autologous tumor cells, specific immune responses to a vaccine should reflect overall clinical response. Although the cellular immune response to the vaccine can be measured via a delayed-type hypersensitivity skin test and has been correlated with improved clinical outcome of patients with American Joint Committee on Cancer stage IV melanoma,12,41 it was not associated with significantly improved DFS or OS in a recent study of patients with American Joint Committee on Cancer stage II melanoma.48 In that study, 5-year OS was 60% when the delayed-type hypersensitivity skin test was less than 4 mm, compared with 75% when the skin test was 4 mm (P = .4607). It is possible that the cellular immune response may not play as critical a role in the destruction of tumor cells when the tumor burden is low; that is, in earlier stage melanoma or in patients rendered free of disease by surgery.
As expected, preoperative anti-TA90 IgG and IgM titers were similar between vaccine and observation groups (P = .1843 and P = .7214, respectively). The majority of patients had preoperative IgG titers less than 400 (57% of patients) and preoperative IgM titers less than 800 (91% of patients). Interestingly, low preoperative anti-TA90 IgG titer was associated with improved DFS and OS (P = .041 and P = .032, respectively) in the vaccine group (Table 5 All patients had detectable anti-TA90 IgG and IgM titers at baseline, which suggests the endogenous induction of a low-level humoral immune response to TA90 expressed by the patients (autologous) melanoma cells. Furthermore, adjuvant therapy with the vaccine elicited a stronger anti-TA90 humoral immune response than did surgery alone. Twenty vaccine patients (47%) but no observation patients had a four-fold elevation of the anti-TA90 IgG titer. Likewise, 25 vaccine patients (58%) but no observation patients had a four-fold elevation of anti-TA90 IgM titer. However, maximal anti-TA90 IgG titers were not significantly different between the two groups (P = .1035), whereas the maximal anti-TA90 IgM titers were significantly different (P = .0022).
IgM titers that increased to at least 800 correlated with improved survival (Figs 1 It is more difficult to induce active immunity against tumor antigens than viral or bacterial antigens because most tumor antigens identified to date are normal or mutated autoantigens.50 Therefore, various vaccine adjuvants have been tested to maximize the benefit from active specific immunotherapy. In a study by Basalp et al,51 purified IgM-type monoclonal antibody against hepatitis B virus (HBv) vaccine was complexed to commercially available HBv vaccine. When compared with HBv vaccine alone, the HBv vaccine-IgM complex enhanced the immune response at all doses, and antibody levels increased with increasing concentrations of HBv antigens in the vaccines formulation. In our study, we hypothesize that the improved survival of patients with an enhanced anti-TA90 IgM response to the vaccine might reflect an adjuvant effect: formation of a vaccine-IgM complex that could elicit a clinically stronger anti-TA90 immune response. The antitumor activity of IgM antibody has been correlated with improved survival in nonmelanoma malignancies.52,53 In conclusion, we have demonstrated that adjuvant therapy with a therapeutic polyvalent cancer vaccine induces a stronger humoral immune response to TA90 than does surgery alone. Almost 60% of our vaccine patients but none of the observation patients had a four-fold elevation of anti-TA90 immunoglobulin titers. Enhanced titers of anti-TA90 IgM but not anti-TA90 IgG correlated with improved DFS and OS. Conversely, nonresponders to the vaccine (no enhancement of anti-TA90 IgM) did not have improved outcome when compared with observation patients. Because most vaccine therapy is administered over a protracted period that often exceeds 12 months, changes in the humoral response to TA90 during vaccine therapy might be used to determine whether the vaccine should be continued or replaced with alternate therapies such as interferon alfa-2b. Because most systemic treatment regimens for melanoma are associated with significant toxicity, adjuvant active specific immunotherapy with a nontoxic preparation, such as Canvaxin therapeutic polyvalent cancer vaccine, should be investigated after surgical resection of high-risk cutaneous melanomas. In addition, future investigations should focus on enhancing the IgM response to TA90 and other selected immunogenic proteins that are commonly expressed by human melanoma cells.
Canvaxin and CancerVax are trademarks of CancerVax Corporation.
Supported in part by grant nos. CA12582 and CA29605 from the National Cancer Institute, Bethesda, MD, and by funding from the Wayne and Gladys Valley Foundation, Oakland, CA, and the Harold McAlister Charitable Foundation, Los Angeles, CA. Presented at the Thirty-Seventh Annual Meeting of the American Society of Clinical Oncology, San Francisco, CA, May 1519, 2001.
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Copyright © 2003 by the American Society of Clinical Oncology, Online ISSN: 1527-7755. Print ISSN: 0732-183X
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