The anticancer potential of Newcastle disease virus (NDV) has been investigated in clinical studies in the United States, Canada, China, Germany, and Hungary. These studies have evaluated the use of oncolysates,[1-14] whole cell vaccines,[14-37] and infection of patients with a lytic strain of the virus.[14,38-52] Findings from most of the studies, almost all of which were phase I or phase II clinical trials, have been reported in English-language biomedical journals. Overall, the results of these studies must be considered preliminary. Most studies enrolled only small numbers of patients, and historical control subjects, rather than actual control groups, which were often used for outcome comparisons. In addition, the evaluation of many studies is made difficult by poor descriptions of study design and the incomplete reporting of clinical data.Immunotherapy With Oncolysates
The following information is summarized in a table located at the end of this section.
The use of NDV oncolysates in patients with metastatic melanoma was evaluated in four clinical studies in the United States.[1,2,4,6,9-11,14] Three of these studies—a phase I clinical trial [9,10] and two phase II clinical trials [1,2,4,11]—were conducted by the same group of investigators. In all four studies, NDV strain 73-T was used to prepare oncolysate vaccines.
In the phase I study,[9,10] 13 patients who had advanced disease and who had not responded to conventional therapy (surgery alone or surgery plus chemotherapy and/or radiation therapy) were treated subcutaneously once a week or once every other week with injections of NDV oncolysates prepared from either their own tumor cells (i.e., autologous vaccines) or cultured melanoma cell lines (i.e., allogeneic vaccines). Several patients received additional conventional therapy while undergoing NDV treatment. Blood samples collected during the study showed increases in T cell numbers and the cytotoxic activity of lymphocytes in most patients (the latter was measured against melanoma cells in vitro ). One patient showed a complete response. This patient, who was alive and apparently cancer-free at the end of the study period (a survival of more than 112 weeks), received six courses of chemotherapy while undergoing oncolysate treatment and had the least advanced disease of the patients studied. Minor responses in some skin and lymph node metastases were noted in several other patients, but no responses in visceral metastases were detected.
As indicated above, the researchers who conducted this phase I study also conducted two phase II studies. The phase II studies tested the ability of NDV oncolysates to delay the progression of melanoma from regional cancer to systemic disease.[1,2,4,11] The patients in these phase II studies had undergone surgery to remove the primary cancer and the radical lymph node dissection because of the presence of palpable disease in regional lymph nodes.
The first phase II study involved 32 patients, 5 of whom had been treated previously with other types of immunotherapy.[1,2,4,11] Melanoma was detected in 1 to 3 regional lymph nodes in 84% of the patients, in 4 to 5 regional lymph nodes in 9% of the patients, and in 6 to 8 regional lymph nodes in 6% of the patients. The second phase II study was initiated 4 years after the start of the first one, and it involved 51 additional patients.[1,2,11] Among these latter patients, 66% had melanoma detected in 1 to 3 regional lymph nodes, 16% had melanoma detected in 4 to 5 regional lymph nodes, and 18% had melanoma detected in 6 or more regional lymph nodes.[1,2,11]
In both studies, the patients were given subcutaneous injections of NDV oncolysates once a week for 4 weeks, beginning 4 to 8 weeks after surgery, followed by more subcutaneous injections given every 2 weeks until 1 year after surgery, and then continued subcutaneous injections given at intervals that increased gradually to every 3 months over the course of a 5-year period. From years 5 through 15 after surgery, some patients received additional oncolysate injections, which were given at intervals varying in length from 3 months to 6 months. Four of the patients in the first study were treated with both autologous and allogeneic vaccines, whereas the remaining patients in that study and all of the patients in the second study were treated with allogeneic vaccines only. Five years after surgery, 72% of the patients in the first study and 63% of the patients in the second study were reported to be alive and free of detectable melanoma. The corresponding survival value for historical control subjects who had palpable regional disease was approximately 17% (a value derived from the scientific literature). Ten years after surgery, 69% of the patients in the first study and 59% of the patients in the second study were reported to be alive and free of detectable melanoma, compared with survival values of 5% to 15% for historical control subjects who had palpable regional disease or 33% for historical control subjects who had either palpable regional disease or microscopic evidence of regional lymph node metastasis.[1,2] Fifteen years after surgery, overall survival values of 59% and 53% were reported for patients in the first and second studies, respectively, with one survivor in the first study experiencing metastatic disease. In general, survival in these two studies did not seem to be influenced by the number of regional lymph nodes that were positive for cancer at the time of radical lymph node dissection, and the patients who received both autologous and allogeneic vaccines did not appear to fare any better than the patients who received allogeneic vaccines only.
The fourth U.S. study of NDV oncolysates in patients with melanoma was also a phase II trial. This trial, which was conducted by a different group of researchers, involved 24 patients who likewise had disease that had spread to regional lymph nodes. The patients in this trial were treated in a manner similar to that of the patients in the other two phase II trials. In this trial, however, only 37% of the patients remained disease free 5 years after surgery; this disease-free survival percentage did not differ substantially from the 30% disease-free survival estimated for a group of historical control subjects who had been treated at the same institution with surgery alone or surgery and another type of adjuvant therapy.
In contrast to the evidence of benefit found in the other phase II trials, the absence of benefit for NDV oncolysates in this fourth clinical trial remains to be explained. It has been reported that different methods of oncolysate preparation were used by the two groups of investigators who conducted these studies. The positive results obtained by the first research group, however, must be viewed with caution. Until these results are confirmed independently in larger, randomized clinical trials, they should be considered preliminary.
Two additional phase II studies of NDV oncolysates have been conducted in Germany. One study involved 208 patients with locally advanced renal cell carcinoma (i.e., large tumors and no regional lymph node metastasis or tumors of any size and 1 or 2 regional lymph nodes positive for cancer).[8,12] The second study involved 22 patients with either metastatic breast cancer or metastatic ovarian cancer.[5,7]
In the advanced renal cell carcinoma study,[8,12] strain 73-T was used to prepare autologous oncolysates that were given to patients by subcutaneous injection once a week for 8 to 10 weeks beginning 1 to 3 months after radical surgery (i.e., nephrectomy and regional lymph node dissection). Two cytokines, low-dose recombinant interleukin-2 and recombinant interferon -alpha, were added to the oncolysate vaccines. Among the 208 patients who entered this study, 203 were followed for a period of time that ranged from 6 months to 64 months from the date of surgery, and these patients were considered evaluable for response. Approximately 91% of the evaluable patients remained free of detectable cancer during follow-up; 9% showed signs of progressive disease. The median time to relapse was more than 21 months. Fifty-six of the evaluable patients had 23 months to 64 months of follow-up from the time of surgery, and approximately 18% of these individuals showed signs of progressive disease during follow-up. All relapses in this subset of 56 patients occurred within 34 months of surgery.
The researchers who conducted this study concluded that the results demonstrated improved disease-free survival for the study subjects in comparison with survival data published in the scientific literature for similar patients who were treated with surgery alone.[8,12] Because this study was uncontrolled, however, it is not clear whether the improvement in disease-free survival was due to chance alone, to oncolysate therapy alone, to cytokine therapy alone, or to the combination of oncolysate therapy and cytokine therapy.
The same research group conducted a parallel investigation in which immune system responses to combination oncolysate and cytokine therapy were measured in 38 patients who had advanced renal cell carcinoma. In this parallel study, responses to NDV antigens (i.e., the production of anti-NDV antibodies) and transient increases in blood levels of the cytokines interferon-alpha, interferon-gamma, and tumor necrosis factor (TNF)-alpha were found, but responses thought to be important to effective antitumor immunity (i.e., the production of antibodies against tumor-specific antigens, increases in natural killer (NK) cell activity, and increases in blood levels of helper T cells [i.e., CD4 antigen–positive cells] and cytotoxic T cells [i.e., CD8 antigen–positive cells]) were not.
The phase II study of NDV oncolysates in patients with metastatic breast or metastatic ovarian cancer was described by its investigators as a study of autologous, whole cell vaccines.[5,7] The lytic strain Italien, however, was used in this study, so it is likely that immune system responses in the treated patients were stimulated by cellular fragments rather than by intact cancer cells.
In the study, 22 patients were vaccinated by intradermal injection at least 3 times during a 6- to 8-week period that began 2 weeks after surgery to remove malignant cells (either primary tumor cells or metastatic tumor cells). The patients also received intravenous injections of cyclophosphamide, high-dose recombinant interleukin-2, and autologous lymphocytes that had been simulated in vitro by treatment with interleukin-2. The cyclophosphamide was administered to block the activity of a class of T cells (i.e., suppressor T cells) that might weaken the desired immune responses. On average, the patients were followed for a period of 23 months from the time of surgery. Nine patients were reported to have either a complete response or a partial response after vaccine therapy. Five patients had stable disease, and eight had progressive disease. The average duration of response was 5 months, after which disease progression was again observed. Blood samples taken from the patients during therapy showed increases in the numbers of NK cells and increases in serum concentrations of the cytokines interferon-alpha and TNF-alpha, but these changes did not persist. No other immune system responses were detected. Because this was an uncontrolled study, it is unclear whether any of the observed clinical and/or immune system responses can be attributed to treatment with NDV oncolysates. Furthermore, because the lytic strain Italien was used in the study, the possibility that the observed tumor regressions were due, in part, to oncolysis cannot be ruled out.Table 2. Studies of NDV Oncolysates in Which Therapeutic Benefit Was Assesseda,b
|Reference Citation(s)||Type of Study||Type of Cancer||No. of Patients: Enrolled; Treated; Controlc||Strongest Benefit Reportedd||Concurrent Therapye||Level of Evidence Scoref|
|[1,2,4,11]||Phase II trial||Advanced melanoma||32; 32; Historical controls||Improved overall survival||No||3iiA|
|[1,2,11]||Phase II trial||Advanced melanoma||51; 51; Historical controls||Improved overall survival||No||3iiA|
|||Phase II trial||Advanced melanoma||24; 24; Historical controls||None||No||3iiDi|
|[5,7]||Phase II trial||Metastatic breast or ovarian||22; 22; None||Complete/partial tumor response, 9 patients||Yes||3iiDiii|
|[8,12]||Phase II trial||Advanced renal cell||208; 203; Historical controls||Improved disease-free survival||Yes||3iiiDi|
|[9,10]||Phase I trial||Advanced melanoma||13; 13; None||Complete tumor response, 1 patient||Yes||3iiiDii|
|No. = number.|
|aRefer to text and the NCI Dictionary of Cancer Terms for additional information and definition of terms.|
|bOncolysates are prepared from virus-infected cancer cells; they consist primarily of cell membrane fragments and contain virus proteins and cancer cell proteins.|
|cNumber of patients treated plus number of patients control may not equal number of patients enrolled; number of patients enrolled = number of patients initially recruited/considered by the researchers who conducted a study; number of patients treated = number of enrolled patients who were given the treatment being studied AND for whom results were reported; historical control subjects are not included in number of patients enrolled.|
|dThe strongest evidence reported that the treatment under study has anticancer activity or otherwise improves the well-being of cancer patients.|
|eChemotherapy, radiation therapy, hormonal therapy, or cytokine therapy given/allowed at the same time as oncolysate treatment.|
|fFor information about levels of evidence analysis and an explanation of the level of evidence scores, refer to Levels of Evidence for Human Studies of Cancer Complementary and Alternative Medicine.|
Immunotherapy With Whole Cell Vaccines
The following information is summarized in a table located at the end of this section.
Most clinical studies of NDV-infected, whole cell vaccines that have been reported in scientific literature were conducted in Germany.[15-27,31,32] However, the largest reported trial was performed in China.[14,33-36] Most of these studies involved patients with colorectal cancer,[15,16,19,20,22,33] breast cancer,[17,18,25] ovarian cancer,[17,18,23] renal cell cancer,[21,26] or malignant glioma. The nonlytic strain NDV Ulster was used to prepare autologous tumor cell vaccines in all of the studies.
Data from a 2004 pilot clinical trial of an NDV-modified autologous tumor vaccine in 20 patients with stage III or IV head and neck squamous cell carcinomas suggest that the vaccine strategy can stimulate human antitumor immune responses in a manner similar to those found in animal models and may significantly prolong 5-year survival rates in this patient population. The study demonstrated the feasibility and safety of the vaccine regimen, and no major side effects were observed in any of the patients.
The use of NDV-infected, whole cell vaccines in patients with either locally advanced or metastatic colorectal carcinoma was examined in one phase I clinical trial and two phase II clinical trials.[15,16,19,20,22] The phase I trial helped establish the optimum number of tumor cells and the optimum amount of virus to use in the average patient to produce the best possible immune response. Immune responses were monitored by means of a skin test that measured the extent of inflammation and hardening of the skin at vaccination sites (i.e., delayed-type hypersensitivity responses). The exact number of patients treated in this trial cannot be determined because nonidentical patient populations were described in the two published study reports.[19,20] One report lists 16 patients: 2 with stage II disease, 4 with stage III disease, and 10 with stage IV disease. The second report lists 20 patients: 12 with stage II disease and 8 with stage III disease. It is also not clear whether findings from individual patients were reported twice (i.e., in both trial reports). Patients with metastatic disease were allowed to enter this trial only if they had a solitary metastatic tumor.
In the trial, NDV-infected, autologous whole cell vaccines were administered to patients by intradermal injection beginning 4 weeks after surgery to remove the primary tumor or the metastatic tumor. Each patient received a total of 5 vaccinations, 4 given at 10-day intervals and a final booster given approximately 23 weeks after surgery. One of the study reports  states that 75% of the patients (12 of 16) showed increased immune system reactivity against uninfected, autologous tumor cells during the vaccination program. These responses were monitored by injecting uninfected, irradiated tumor cells into the skin and looking for delayed-type hypersensitivity responses. Histologic examination of several vaccination sites during the trial showed the presence of infiltrating immune system cells. These infiltrating cells were composed primarily of helper T cells; some cytotoxic T cells were also present, but B cells (i.e., antibody-producing cells) were either scarce or absent.
The two phase II trials looked for evidence of therapeutic benefit in patients who had either metastatic colorectal carcinoma [15,22] or locally advanced colorectal carcinoma. The trial that involved patients with metastatic disease recruited 23 individuals whose colorectal cancer had recurred in the liver following treatment of their primary tumor or whose colorectal cancer and liver metastases were diagnosed at the same time.[15,22] After surgery to remove the primary tumor and/or the metastases, all patients appeared to be free of residual cancer. NDV-infected, autologous tumor cells were then administered by intradermal injection every 2 weeks beginning 2 weeks after surgery. The total number of vaccinations given to the patients in this trial, however, is not clear. One of the two trial reports indicates that each patient received four vaccinations and a booster, which was given approximately 23 weeks after surgery. The second trial report  indicates that each patient received five vaccinations and a booster. No additional treatment (chemotherapy or radiation therapy) was allowed during the trial.
During 18 months of follow-up, 14 of the 23 (61%) patients in this trial had relapses of their cancer, compared with relapses in 20 of 23 (87%) historical control subjects who were treated with surgery alone by the same surgeons at the same hospital. Although this difference in disease-free survival was statistically significant, there was no statistically significant difference in overall survival between the study subjects and the historical control subjects. The researchers also reported that, in general, the patients who had the strongest immune system responses against uninfected autologous tumor cells after vaccination had the longest disease-free survival times. It should be noted, however, that the reporting of patient responses against uninfected autologous tumor cells in this trial was inconsistent.[15,22] One trial report, which described results after 12 months of follow-up, indicates that 11 of 23 patients showed increased immune system reactivity against uninfected autologous tumor cells during the vaccination program; whereas the second trial report, which described results after 18 months of follow-up, indicates that only 9 of 23 patients showed increased reactivity against uninfected autologous tumor cells.
The phase II trial that involved patients with locally advanced colorectal carcinoma (i.e., large tumors and no regional lymph node metastasis or tumors of any size and regional lymph nodes that were positive for cancer) recruited 57 individuals. Among these 57 patients, 48 were treated with NDV-infected, whole cell vaccines, and 9 were treated with vaccines composed of autologous tumor cells and the bacterium Bacillus Calmette Guerin (BCG), which also has been used as an immune system stimulator. Patients recruited for this trial were treated first with surgery and then were given a choice between participating in the trial or receiving chemotherapy. The individuals who chose to participate in the trial were injected intradermally with the appropriate autologous tumor cell vaccines every other week for a total of 6 weeks (i.e., 3 vaccinations per patient) beginning 6 to 8 weeks after surgery. The follow-up period ranged from 6 months to 43 months (median of 22 months), and disease-free survival and overall survival were estimated for the vaccinated patients and for 661 historical control subjects who were treated with surgery alone. Two years after surgery, overall survival for the patients who were treated with NDV-infected, autologous whole cell vaccines was 98%, compared with 67% overall survival for the patients who were treated with BCG tumor cell vaccines and 74% overall survival for the historical control subjects. The differences in survival between the NDV/tumor-cell–vaccinated group and the other two groups were statistically significant. Disease-free survival 2 years after surgery for the NDV/tumor-cell–treated patients was 72%. The researchers who conducted this trial also reported that overall survival for the NDV/tumor-cell–treated group was comparable to that of the group of patients (n = 15) who chose to be treated with chemotherapy rather than immunotherapy.
Two additional phase II studies investigated the use of NDV-infected, autologous tumor cell vaccines in patients who had either ovarian cancer or renal cell cancer.[21,23] The ovarian cancer trial enrolled 82 patients, but only 39 were evaluable for response. The published report of this trial, however, described clinical findings for just 24 evaluable patients who had stage III disease; results for the remaining evaluable patients (5 with stage I disease, 5 with stage II disease, and 5 with stage IV disease) were not presented. The patients in this trial were treated with surgery and six courses of chemotherapy in addition to three courses of intradermally administered immunotherapy, but details about the adjuvant treatments (e.g., what constituted a course of immunotherapy or what chemotherapy drugs were used in addition to cisplatin) were very limited. Among the 24 evaluable patients with reported clinical findings, 15 had a complete remission, 8 had a partial remission, and 1 had progressive disease. The median disease-free survival time for the patients who had a complete remission was 30 months. These results were described as very encouraging by the investigators who conducted the study, but the degree of benefit afforded by the immunotherapy in this uncontrolled study cannot be established. In common with other studies of NDV-infected tumor cell vaccines, histologic examination of individual vaccination sites revealed the presence of infiltrates consisting predominantly of helper T cells.
The phase II trial of NDV-infected, autologous tumor cell vaccines in patients with renal cell cancer enrolled 40 individuals whose disease had spread from the kidney to at least 1 other organ. The patients in this trial underwent surgery (i.e., radical nephrectomy) to remove the primary tumor and then were given intradermal injections of NDV-infected tumor cells at 3 weeks and 5 weeks after surgery. The patients were also given subcutaneous injections of low-dose recombinant interleukin-2 and recombinant interferon-alpha. Five patients had a complete response, and six had a partial response. After 4 years of follow-up, overall survival for these 11 responding patients was 100%. Among the remaining 29 patients, 12 had stable disease (median survival = 31 months) and 17 had progressive disease (median survival = 14 months). The researchers also reported a median survival time of 13 months for 36 historical control subjects who were treated with surgery and other types of adjuvant therapy (chemotherapy, radiation therapy, or hormonal therapy). The overall percentage of patients with either a complete response or a partial response in this uncontrolled study (i.e., 28%) is similar to that found in other studies in which comparable patients were treated with cytokine therapy but not vaccine therapy. Therefore, it is not clear whether any of the apparent clinical benefit in this trial can be attributed to vaccination with NDV-infected tumor cells.
A fifth phase II clinical trial tested NDV-infected, autologous tumor cell vaccines in 43 patients who had various advanced cancers (16 ovarian, 22 breast, 1 cervical, 1 vaginal, 1 lung, and 1 chondrosarcoma) that had not responded to previous treatment. The patients in this trial received intravenous injections of cyclophosphamide and epirubicin, subcutaneous injections of low-dose recombinant interleukin-2 and interferon-alpha, and intradermal injections of the tumor cell vaccines. The cyclophosphamide and epirubicin were administered to block the activity of suppressor T cells that might weaken the desired immune responses. The trial report provided no information about the treatments that had failed, the time intervals between the failure of the last treatment and the beginning of immunotherapy, or how many vaccinations each patient received. The researchers considered 31 of the 43 patients to be evaluable for response. Among the evaluable patients, one individual who had ovarian cancer had a complete response that lasted more than 2 months. The remaining evaluable patients had either partial responses (n = 11), stable disease (n = 10), or progressive disease (n = 9) following treatment. In view of the limited information given, no conclusions can be drawn from this uncontrolled study about the effectiveness of NDV-infected, autologous whole cell vaccines in this patient population.
One additional clinical study evaluated the effect of vaccine quality on the survival of patients who were treated with NDV-infected, autologous tumor cells. In this retrospective study, survival was estimated separately for three groups of patients who had early breast cancer (n = 63), metastatic breast cancer (n = 27), or metastatic ovarian cancer (n = 31) and who had sufficient numbers of recovered tumor cells to allow at least two vaccinations. Most of the patients who had early breast cancer were treated after surgery with conventional adjuvant therapies (chemotherapy, radiation therapy, and/or hormonal therapy) in addition to vaccine therapy. The patients who had metastatic breast or ovarian cancer had failed to respond to conventional treatments before the start of vaccine therapy. In addition to receiving tumor cell vaccines, these latter patients were treated with oral indomethacin and cimetidine, intravenous cyclophosphamide and epirubicin, and subcutaneous low-dose recombinant interleukin-2 and interferon-alpha. The indomethacin, cimetidine, cyclophosphamide, and epirubicin were given in an attempt to prevent the suppression of desired immune system responses. The autologous vaccines were classified as either high quality or low quality on the basis of the following two parameters: the ratio of tumor cells to other types of cells and the percentage of live tumor cells. The median times from surgery to the start of immunotherapy were 13 days, 27 days, and 28 days for the patients who had early breast cancer, metastatic breast cancer, and metastatic ovarian cancer, respectively.
Overall survival 4 years after surgery was estimated to be 96% for the patients with early breast cancer who had received a high-quality vaccine (n = 32), compared with an overall survival of 68% for those who had received a low-quality vaccine (n = 31). For the patients with metastatic breast cancer, the median survival time was estimated to be 1.75 years from the start of immunotherapy for those who had received a high-quality vaccine (n = 13), compared with a median survival time of 0.75 years for those who had received a low-quality vaccine (n = 14) (median follow-up time = 1.4 years). For patients with metastatic ovarian cancer, the median survival time was estimated to be 1.16 years from the start of immunotherapy for those who had received a high-quality vaccine (n = 18), compared with a median survival time of 0.84 years for those who had received a low-quality vaccine (n = 13) (median follow-up time = 1.23 years). The only survival difference that was statistically significant was the one for the patients who had early breast cancer. The retrospective nature of this study and the small numbers of patients in each treatment group should be viewed as major weaknesses.
In two of the above-mentioned studies, the phase I colorectal cancer study [19,20] and the phase II ovarian cancer study, histologic examination of several vaccination sites revealed the presence of infiltrating immune system cells. These infiltrating cells, however, consisted primarily of helper T cells (CD4 antigen–positive cells); cytotoxic T cells (CD8 antigen–positive cells) were present, but only as a minor component. In another study, vaccination sites from five cancer patients (two with colon cancer, two with melanoma, and one with ovarian cancer) also contained infiltrates of predominantly helper T cells. In fact, CD8 antigen–positive T cells could not be detected in the lymphocytes cultured from vaccination sites of two of these five patients.[27,22] The presence of small numbers of cytotoxic T cells at vaccination sites may be an important factor to consider when evaluating the results of the whole cell vaccine trials because animal studies [54-57,16,19,58-66] and human studies  have suggested that this class of T cells is required for effective, long-term anticancer immunity. It should also be noted that, in another study, increases in NK cell activity were measured in blood samples from two patients with colorectal cancer who exhibited delayed-type hypersensitivity responses at vaccination sites, but cytotoxic T cells directed against tumor-specific antigens could not be detected. Overall, these results indicate that NDV-infected, autologous, whole cell vaccines may be able to stimulate NK cell activity, which may have contributed the clinical outcomes described above, but also that these vaccines may be ineffective in promoting at least one additional immune system response (i.e., the production of tumor-specific antigen-targeted cytotoxic T cells) thought to be important to establishing long-term anticancer immunity. Whether the inclusion of bispecific monoclonal antibodies (refer to the Laboratory/Animal/Preclinical Studies section of this summary for more information) in the whole cell vaccines will make them more effective remains to be determined.Table 3. Studies of NDV-Infected Tumor Cell Vaccines in Which Therapeutic Benefit Was Assesseda
|Reference Citation(s)||Type of Study||Type of Cancer||No. of Patients: Enrolled; Treated; Controlb||Strongest Benefit Reportedc||Concurrent Therapyd||Level of Evidence Scoree|
|||Phase II/III (adjuvant setting)||Melanoma||29; 21; 8||No advantage of vaccine for disease free survival or overall survival||None||1iA|
|||Phase III (adjuvant setting)||Colorectal with liver metastases||51; 25; 26||Planned subgroup analysis, overall and disease free survival advantages in the colon of cancer patients||Protocol therapy was given after complete surgical resection of primary tumor and liver metastases||1iiA|
|||Phase II||Glioblastoma||35; 23; 87 (concurrent controls identified from within same hospital)||Median progression-free survival of vaccinated patients was 40 wk (vs. 26 wk in controls; log-rank test, P = .024), median OS of vaccinated patients was 100 wk (vs. 49 wk in controls; log-rank test, P < .001)||Protocol therapy after surgical debulking of tumor followed by radiation therapy||2A|
|[15,22]||Phase II trial||Metastatic colorectal||23; 23; Historical controls||Improved disease-free survival||No||3iiA|
|||Phase II trial||Ovarian||82; 24h; None||Improved disease-free survival||Yes||3iiDi|
|||Phase II trial||Advanced colorectal||57; 48f; Historical controls||Improved overall survival||No||3iiiA|
|||Retrospective analysis||Early breast||63; 63; Internal controlsg||Improved overall survival||Yes||3iiiA|
|||Phase II trial||Metastatic renal cell||40; 40; Historical controls||Improved overall survival, 11 patients with complete/partial responses||Yes||3iiiA|
|||Phase II trial||Various advanced||43; 31; None||Complete tumor response, 1 patient||Yes||3iiiDiii|
|||Phase II||Gastrointestinal tumors, stage IV||25; 25; 0||1 Complete response, 5 partial responses, overall response rate = 24%||None described||3iiiDiii|
|||Phase III||Colorectal||567; 310; 257||Higher mean and median survival for vaccination group compared to the resection group alone||None described||None describedi|
|No. = number; wk = week.|
|aRefer to text and the NCI Dictionary of Cancer Terms for additional information and definition of terms.|
|bNumber of patients treated plus number of patients control may not equal number of patients enrolled; number of patients enrolled = number of patients initially recruited/considered by the researchers who conducted a study; number of patients treated = number of enrolled patients who were given the treatment being studied AND for whom results were reported; historical control subjects are not included in number of patients enrolled.|
|cThe strongest evidence reported that the treatment under study has anticancer activity or otherwise improves the well-being of cancer patients.|
|dChemotherapy, radiation therapy, hormonal therapy, or cytokine therapy given/allowed at the same time as vaccine therapy.|
|eFor information about levels of evidence analysis and an explanation of the level of evidence scores, refer to Levels of Evidence for Human Studies of Cancer Complementary and Alternative Medicine.|
|fOnly 48 patients were treated with NDV-infected tumor cell vaccines; the remaining patients were treated with another type of vaccine.|
|gThe patients were divided into groups that received a high-quality vaccine or a low-quality vaccine; the low-quality vaccine groups served as the controls; 32, 13, and 18 patients with early breast cancer, metastatic breast cancer, and metastatic ovarian cancer, respectively, received high-quality vaccines; the corresponding low-quality vaccine groups contained 31,14, and 13 patients.|
|hThere were 39 evaluable patients in this study, but findings were reported for only 24 patients.|
|iArticle does not provide enough information.|
Infection of Patients With NDV (Including Strain MTH-68)
The following information is summarized in a table located at the end of this section.
To date, most research into the treatment of human cancer by infection of patients with NDV has been conducted in Hungary.[38,39,41,42,14,49-51] The Hungarian research effort has been led by a single group of investigators who advocate the use of NDV strain MTH-68, which is presumed to be lytic. Findings from these investigations have been published in the form of an anecdotal report that briefly describes results for 3 patients who had metastatic disease; a single case report about a child who had glioblastoma multiforme; a report of a small case series that included 4 individuals with advanced cancer; and a report of a placebo-controlled, phase II clinical trial that included 33 patients in the NDV treatment group and 26 patients in the placebo group. The patients in the phase II trial had various advanced cancers. According to the investigators, MTH-68 treatment was beneficial for the majority of these patients.
The five patients described in the case report and the small case series were reported to have had either a complete remission or a partial remission following NDV therapy.[38,42] Two of the patients in the case series had advanced colorectal cancer, another had melanoma, and the fourth had advanced Hodgkin disease. These five patients were treated with NDV daily for periods of time that ranged from 1 month to 7 years. Inhalation and intravenous injection were the main routes of virus administration. One of the patients with colorectal cancer, however, was treated by means of intracolonic injection (i.e., via a colostomy opening) for 4 weeks. It is important to note that all five patients were treated with conventional therapy before the start of NDV therapy and that four of the five received conventional therapy either concurrently with NDV therapy or after it. Given the small number of patients, the absence of control subjects, and the overlapping treatments, it is difficult to draw conclusions about the effectiveness of NDV therapy from these small studies. Nonetheless, taken as a whole the results of the available NDV studies suggest potential clinical value warranting further study with controlled clinical trials.
In the phase II trial, NDV was administered by inhalation only 2 times a week for a period of 6 months. The 33 patients in the NDV treatment group had the following types of cancer: colorectal (n = 13), stomach (n = 6), kidney (n = 3), pancreatic (n = 3), lung (n = 1), breast (n = 1), ovarian (n = 1), melanoma (n = 1), bile duct (n = 1), gallbladder (n = 1), sarcoma (n = 1), and ependymoma (n = 1). The distribution of cancers among the 26 patients in the placebo group was as follows: colorectal (n = 5), stomach (n = 3), kidney (n = 6), lung (n = 1), breast (n = 1), melanoma (n = 7), bile duct (n = 1), sarcoma (n = 1), and bladder (n = 1). Twenty-four (73%) of the patients in the NDV treatment group had distant metastases when they were recruited into the trial, compared with 22 (85%) of the patients in the placebo group. Thirty-one (94%) of the patients in the NDV treatment group received some form of conventional therapy (surgery, chemotherapy, or radiation therapy) before the start of virus therapy; 9 (29%) of these patients were treated with more than one type of conventional therapy. All (100%) of the patients in the placebo group received conventional therapy before the start of virus therapy; 15 (58%) of these individuals were treated with more than one type of conventional therapy. The average age of the patients in the NDV treatment group was 62.6 years, compared with an average age of 55.4 years for the patients in the placebo group. The two groups, however, were well-balanced with respect to gender distribution (61% males and 39% females in each treatment group) and average performance status (1.39 for each group, based on the following scale: 0 = free from complaints, 1 = capable of easy work, 2 = less than 50% bed rest required, 3 = more than 50% bed rest required, 4 = 100% bedridden). Two complete responses and six partial responses were reported for patients in the NDV treatment group, whereas no responses were observed in the placebo group. In the NDV treatment group, ten patients were reported to have stable disease, compared with just two patients in the placebo group. In addition, more patients in the NDV treatment group than in the placebo group reported subjective improvements in their quality of life. Twenty-two (67%) of the patients in the NDV treatment group survived at least 1 year, compared with 4 (15%) of the patients in the placebo group. The 2-year survival proportions were 21% and 0% for patients in the NDV treatment group and the placebo group, respectively.
This phase II trial had a number of weaknesses that could have influenced its outcome. The most important weakness is the fact that the patients were not randomly assigned to the two treatment groups. This lack of randomization raises the possibility of selection bias. In this regard, it is noteworthy that a larger percentage of patients in the NDV treatment group than in the placebo group received conventional therapy within the 3 months preceding the initiation of NDV therapy (82% vs. 58%). In fact, the average time between the completion of conventional therapy and the start of NDV therapy among the patients who had a either a complete response or a partial response was 1.8 months. Therefore, the contribution of NDV therapy to the observed clinical outcomes is difficult to determine.
In a phase I trial that was conducted in the United States, another lytic NDV strain, PV701, was tested in patients with various advanced cancers. In this trial, 79 patients whose tumors had not responded to conventional therapy were given intravenous injections of virus. Four different treatment regimens were evaluated as follows:
- A single dose of NDV given once every 28 days (17 patients).
- A single dose of NDV given 3 times during a 1-week period, repeated every 28 days (13 patients).
- Three injections of NDV given during a 1-week period, with the first injection containing a lower dose of virus than the remaining 2, repeated every 28 days (37 patients).
- Six injections of NDV given during a 2-week period, with the first injection containing a lower dose of virus than the remaining 5, repeated every 21 days (12 patients).
The researchers found that the use of lower initial doses of virus allowed the administration of higher subsequent doses. A complete response was reported for one patient, and partial tumor regression was observed in eight patients. Thirteen patients had stable disease for periods of time that lasted from 4 months to more than 30 months. Five patients died during the trial: four due to progressive disease and one due, possibly, to a treatment-related complication (refer to the Adverse Effects section of this summary for more information). Several patients experienced significant adverse side effects from NDV treatment, including fever, fatigue, dehydration, low blood pressure, shortness of breath, and hypoxia. Some patients who experienced these adverse effects required hospitalization. The researchers who conducted this trial have indicated that additional clinical studies are under way.
A major concern about the effectiveness of treating cancer patients by repeated administration of a lytic strain of NDV is the possibility that the immune system will produce virus-neutralizing antibodies. Virus-neutralizing antibodies would prevent NDV from reaching and infecting malignant cells, thereby blocking oncolysis. Impairment of NDV infection would also limit the ability of cytotoxic T cells that target virus antigens to kill virus-infected cancer cells. In addition, limiting the infection of cancer cells would lessen the likelihood that the immune system would become trained to better recognize tumor-specific antigens. The Hungarian investigators have shown that anti-NDV antibodies are produced in MTH-68-treated patients, but they apparently have not determined whether these antibodies are virus-neutralizing. However, the recent observation that immune system tolerance to viruses can be induced by repeated oral administration of virus proteins suggests that the concern about virus-neutralizing antibodies may not be entirely warranted.[68,69] It is conceivable that frequent inhalation (or injection) of NDV may lead to immune system tolerance of this virus. This possibility should be explored in future studies.Table 4. Studies of Cancer Treatment by Infection of Patients With NDVa
|Reference Citation(s)||Type of Study||NDV Strain||Type of Cancer||No. of Patients: Enrolled; Treated; Controlb||Strongest Benefit Reportedc||Concurrent Therapyd||Level of Evidence Scoree|
|||Phase II trial||MTH-68||Various advanced||59; 33; 26, placebo||Improved overall survival||No||2A|
|||Phase I trial||PV701||Various advanced||79; 79; None||Partial tumor regression, 8 patients||Unknown||3iiiDiii|
|||Phase I/II||HUJ||Glioblastoma multiforme, recurrent||14 (phase I–6; phase II–8); 11 (phase I–6, phase II–5); 0||1 transient (3 mo) complete response, all other patients had progressive disease||None||3iiiDiii|
|||Case series||MTH-68||Various advanced||4; 4; None||Complete tumor regression, 2 patients||Yes||4|
|||Selected case series||MTH-68/H||Gliomas, high-grade||4; 4; 0||Radiographically documented responses and long survival with improved symptomatology||Various||4Diii|
|||Phase I||PV701||Various||16; 16; 0||Improved patient tolerability with two-step desensitization||None||N/A|
|||Case report||MTH-68/H||Anaplastic astrocytoma||1; 1; 0||Partial response||Valproic acid||N/A|
|||Case report||73-T||Advanced cervical||1; 1; None||Partial tumor regression||No||None|
|||Anecdotal report||MTH-68||Various metastatic||3; 3; None||Tumor regression||Unknown||None|
|||Case report||MTH-68||Glioblastoma multiforme||1; 1; None||Partial tumor regression||Yes||None|
|||Case report||Hickman||Acute myeloid leukemia||1; 1; None||Partial response||Yesf||None|
|mo = month; No. = number.|
|aRefer to text and the NCI Dictionary of Cancer Terms for additional information and definition of terms.|
|bNumber of patients treated plus number of patients control may not equal number of patients enrolled; number of patients enrolled = number of patients initially recruited/considered by the researchers who conducted a study; number of patients treated = number of patients who were given the treatment being studied AND for whom results were reported; historical control subjects are not included in number of patients enrolled.|
|cThe strongest evidence reported that the treatment under study has anticancer activity or otherwise improves the well being of cancer patients.|
|dChemotherapy, radiation therapy, hormonal therapy, or cytokine therapy given/allowed at the same time as virus treatment.|
|eFor information about levels of evidence analysis and an explanation of the level of evidence scores, refer to Levels of Evidence for Human Studies of Cancer Complementary and Alternative Medicine.|
|fThis patient was treated with chemotherapy and five other types of virus in addition to NDV.|
Current Clinical Trials
Check NCI’s list of cancer clinical trials for cancer CAM clinical trials on oncolytic Newcastle disease virus that are actively enrolling patients.
General information about clinical trials is also available from the NCI Web site.References
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