Medical Policy

This document addresses hematopoietic stem cell transplantation as a treatment of germ cell tumors (testicular, mediastinal, retroperitoneal, ovarian). Germ cell tumors are neoplasms developed from the reproductive germ cell line.

Note: For epithelial ovarian carcinoma, see TRANS.00031 Hematopoietic Stem Cell Transplantation for Autoimmune Disease and Miscellaneous Solid Tumors.

Medically Necessary:

A single autologous hematopoietic stem cell transplantation is considered medically necessary as a treatment of primary germ cell tumors* in individuals treated with standard chemotherapy who had one of the following results:

1. A partial response; or
2. Refractory germ cell tumors; or
3. Relapsed disease.

A planned tandem autologous hematopoietic stem cell transplantation is considered medically necessary as a treatment of primary testicular cancer in individuals treated with standard chemotherapy who had one of the following results:

1. A partial response; or
2. Refractory germ cell tumors; or
3. Relapsed disease.

*Note: Ovarian germ cell tumors must be distinguished from the far more common epithelial ovarian cancers. For epithelial ovarian carcinoma, please refer to TRANS.00031 Hematopoietic Stem Cell Transplantation for Autoimmune Disease and Miscellaneous Solid Tumors.

A repeat autologous hematopoietic stem cell transplantation due to primary graft failure or failure to engraft is considered medically necessary.

Investigational and Not Medically Necessary:

A single autologous hematopoietic stem cell transplantation, in lieu of a course of standard chemotherapy, is considered investigational and not medically necessary as initial treatment of poor prognosis germ cell tumors.

A planned tandem autologous hematopoietic stem cell transplantation is considered investigational and not medically necessary as a treatment of all other non-testicular germ cell tumors.

Allogeneic (ablative and non-myeloablative [mini transplant]) hematopoietic stem cell transplantation is considered investigational and not medically necessary as a treatment of germ cell tumors, including but not limited to, use as a therapy after a prior failed high-dose chemotherapy with autologous hematopoietic stem cell support.

A second or repeat autologous hematopoietic transplant due to persistent, progressive or relapsed disease is considered investigational and not medically necessary.

Hematopoietic stem cell harvesting for a future but unscheduled transplant is considered investigational and not medically necessary.

Germ cell tumors comprise the vast majority of primary testicular neoplasms, although germ cell tumors can arise in the ovary and in extragonadal locations such as the retroperitoneum or mediastinum. Germ cell tumors can be classified according to their histology, stage, prognosis, or response to chemotherapy. Testicular germ cell tumors are classified as either seminoma or nonseminoma. Histologies of nonseminomatous tumors include embryonal cell carcinoma, teratoma, choriocarcinoma, yolk sac tumor, and mixed germ cell tumors.

According to the International Germ Cell Cancer Collaborative Group (IGCCCG) consensus, risk classification of testicular germ cell tumors are separated by nonseminoma and seminoma diagnosis. There is no poor-risk disease in the seminoma category. In nonseminoma, poor prognosis or poor-risk disease is indicated by one of the following: mediastinal primary tumor, nonpulmonary visceral metastases, or elevation of any one post-orchiectomy marker (alpha fetal protein [AFP] greater than 10,000 ng/mL, human choriogonadotropin [hCG] greater than 50,000 IU/L, or lactate dehydrogenase [LDH] greater than 10 times the upper limit of normal) (National Comprehensive Cancer Network^® [NCCN], 2023).

Autologous Hematopoietic Stem Cell Transplantation as Front-Line Therapy of Germ Cell Tumors

Motzer and colleagues (2007) reported results from a Phase III, multicenter, randomized trial of 219 individuals with poor-prognosis, metastatic germ cell tumors. Participants were assigned to conventional-dose chemotherapy (bleomycin, etoposide and cisplatin [BEP]) (n=111) or randomized to BEP plus high-dose chemotherapy (HDCT) with autologous hematopoietic stem cell transplantation (n=108) as first-line therapy. The 1-year durable complete response (CR) rate was 52% after BEP + HDCT and 48% after BEP alone (p=0.53). The median time-to-treatment failure (TTF) was 23.2 months and 11.3 months for individuals in the BEP + HDCT and BEP alone cohorts (p=0.40). With a median follow-up of 51 months, there was no difference in survival for individuals treated with BEP + HDCT versus BEP alone (p=0.94). Survival rate was 83% at 1 year and 71% at 2 years. The authors concluded that the routine inclusion of HDCT after two cycles of BEP in first-line treatment for germ cell tumors with metastases and poor predicted outcome to chemotherapy did not improve survival over four cycles of BEP alone. In addition, the authors noted that four cycles of BEP remains the standard of care for intermediate- and poor-risk germ cell tumors.

Droz and colleagues (2007) reported mature results from a randomized controlled trial of treatment naïve individuals with high-volume, metastatic nonseminomatous germ cell tumors. A total of 115 participants were randomized to receive either double-dose cisplatin with vinblastine and bleomycin (PVeBV) in Arm A compared to PVeBV with high dose chemotherapy followed by autologous bone marrow transplantation in Arm B. Both cohorts were equally balanced with 57 participants after 1 individual was deemed ineligible. There was no statistical significance in complete response (57% and 52%) and non-progressive disease (75% and 67%) in all evaluable participants in Arm A and Arm B, respectively. At a median follow-up of 9.7 years, 31 participants (Arm A) and 27 participants (Arm B) showed no evidence of disease. Five-year survival rates were 75% and 61% with 14 and 18 individuals still alive at 10-year follow-up in Arms A and B, respectively. Based on the results of the trial, the authors concluded that a clinical outcome benefit of high dose chemotherapy with autologous hematopoietic stem cell transplantation as front-line therapy was unproven.

Daugaard and colleagues (2011) reported the outcomes of a randomized Phase III study comparing standard-dose BEP with sequential high-dose VIP (cisplatin, etoposide, and ifosfamide) plus autologous stem-cell support in previously untreated males with poor-prognosis germ-cell cancer. The study aimed to recruit 222 males but closed with 137 men from 27 European oncology centers due to slow accrual. Subjects were age 15-50 years and had previously untreated metastatic poor-prognosis nonseminomatous germ-cell tumor of either testicular or extragonadal origin. The median follow-up was 4.4 years. Toxicity was more severe for those who were treated with high-dose chemotherapy. Death due to toxicity was reported in 2 individuals who received high-dose chemotherapy and 1 in the BEP arm. There was no improvement in complete response rate in the high-dose chemotherapy arm versus the standard-dose arm (44.6% vs. 33.3%, respectively, p=0.18). There was no difference in failure-free survival between the two groups. At 2 years, failure-free survival was 44.8% (95% confidence interval [CI]: 32.5-56.4) and 58.2% (95% CI: 48.0-71.9), respectively for the standard- and high-dose arms. The difference was not statistically significant (p=0.06). Overall survival (OS) did not differ between the two groups (log-rank p>0.1). The authors concluded that high-dose chemotherapy plus autologous stem-cell support given as part of first-line therapy does not improve outcomes in individuals with poor-prognosis germ-cell tumor.

Autologous Hematopoietic Stem Cell Transplantation as Second-Line or Subsequent Therapy of Germ Cell Tumors

According to Einhorn (2007), an international collaborative group has described cure rates of 90 to 95% for low-risk individuals, 75% for intermediate-risk individuals and 40 to 50% in high-risk individuals with metastatic germ cell tumors. The authors describe a retrospective review of 184 consecutive individuals with progressive metastatic testicular cancer after receiving cisplatin-containing chemotherapy regimens. Disease-free survival (DFS) was the primary endpoint of the analysis. Individuals with primary mediastinal nonseminomatous germ cell tumors were ineligible for the study. A total of 173 participants received two planned courses of high-dose chemotherapy each followed by autologous stem cell transplantations. Eleven individuals received only one cycle of autologous stem cells due to progressive disease, toxicity and salvage surgery. One hundred forty-nine participants had nonseminomatous germ-cell tumors, and 35 had seminoma only. At a median follow-up of 48 months, 116 (63%) participants were continuously disease free. Of these, 104 (90%) had been disease free greater than 2 years. Six additional participants achieved complete remission (CR) after additional therapies. Toxic side effects of high-dose chemotherapy included myelosuppression, mucositis, nausea, peripheral neuropathy and dehydration. There were three treatment related deaths due to hepatic failure and pulmonary toxicities. In addition, 3 individuals that received high-dose chemotherapy and transplantation as a third-line or later therapeutic option developed acute leukemia.

Lazarus and colleagues (2007) reported outcomes from an observational study of single and tandem autologous stem cell transplants from the Center for International Blood and Marrow Transplant Research (CIBMTR) database. Results from 102 individuals with planned tandem autologous stem cell transplants were compared with 198 individuals who did not have a second autologous transplant planned. There was no statistically significant difference between the cohorts for 5-year survival probability of 35% in the planned tandem group versus 42% in the group without a planned second transplant (p=0.29). Additionally, the probability of progression-free survival at 5 years was 34% for the planned tandem group compared to 38% (p=0.50) in the group without a planned second transplant. However, the authors noted a statistically significant difference in lower treatment-related mortality at 1 year of 3% for the planned tandem group versus 10% (p=0.02) in the group without a planned second transplant.

Seftel and colleagues (2011) conducted a long-term multicenter follow-up study of 71 males undergoing a single autologous hematopoietic stem cell transplantation for germ cell tumors between January 1986 and December 2004 after an incomplete response to first-line chemotherapy or relapsed disease. The median follow-up was 10.1 years. OS at 5 years was 44.7% (95% CI, 32.9-56.5%) and EFS is 43.5% (95% CI, 31.4-55.1%). There were seven (10%) treatment-related deaths within 100 days of autologous hematopoietic stem cell transplantation. Three (4.2%) individuals developed secondary malignancies. From a total of 33 relapses, 31 occurred within 2 years of the autologous hematopoietic stem cell transplantation. Two very late relapses were noted 13 and 11 years after hematopoietic stem cell transplantation. In a multivariate analysis, favorable outcome was associated with International Germ Cell Consensus Classification (IGCCC) good prognosis disease at diagnosis, primary gonadal disease and response to salvage chemotherapy. The authors concluded that autologous hematopoietic stem cell transplantation results in successful outcome for a relatively large subgroup of individuals with high-risk germ cell tumors; however, late relapses may occur, even after 10 years. They also noted that further study is required to determine how sequential autologous hematopoietic stem cell transplantation compares with a single autologous stem cell transplantation or with standard dose chemotherapy.

Suleiman and colleagues (2013), in a subsequent small study at the same center as the Einhorn trial, evaluated outcomes of 12 individuals with recurrent primary mediastinal nonseminomatous germ cell tumors after initial treatment with cisplatin-containing combination chemotherapy (a group excluded from their previous study). Participants received two consecutive courses of high dose chemotherapy (carboplatin and etoposide) followed by hematopoietic stem cell transplantation. Outcomes of tandem transplant for primary mediastinal nonseminomatous germ cell tumors were generally poor compared to testes cancer, with a median survival of 11 months (range, 4-52 months). However, 3 of 12 subjects achieved a complete remission, 1 subject remained disease free at 50 months of follow up, and 1 remained free of disease following tandem hematopoietic stem cell transplantation and subsequent mediastinal surgery at 52 months of follow-up.

A large single center retrospective analysis (Adra, 2017) performed at Indiana University consisted of 364 individuals with relapsed germ cell tumor with disease progression after cisplatin-based combination therapy. The primary tumor site was testis in the majority of persons (n=316). Other tumor sites were retroperitoneum (n=28) and mediastinum (n=20). Median age of those treated was 32 years (range, 17 to 70 years) and ECOG performance status at treatment initiation was 0-1. Of the 364 total subjects, 341 were treated with the planned two consecutive courses of HDCT consisting of 700 mg/m² carboplatin and 750 mg/m² etoposide, each for 3 consecutive days, and each followed by peripheral blood stem cell transplantation (PBSCT). Treatment was limited to a single course of HDCT in 23 subjects due to progressive disease or toxicity. At a median follow-up of 3.3 years, the 2-year progression-free survival (PFS) was 60% (95% CI, 55% to 65%) and the 2-year OS was 66% (95% CI, 60% to 70%). Of the 143 persons who had disease recurrence after HDCT, the median time to relapse was 4.3 months (range, 1 to 30 months). Overall, 363 individuals had received HDCT as second-line therapy with a 2-year PFS of 63% (95% CI, 57% to 68%), and 61 individuals received HDCT as third-line or subsequent therapy with a 2-year PFS of 49% (95% CI, 36% to 61%). There were 9 treatment-related deaths and secondary leukemia developed in 5 individuals. The authors concluded that HDCT followed by PBSCT was an effective salvage therapy for relapsed germ cell tumor; however, there were both short- and long-term quality of life issues that occurred as a result of HDCT.

Sequential Autologous Hematopoietic Stem Cell Transplantation

Lotz and colleagues (2005) reported the results of a Phase II study of three consecutive cycles of high-dose chemotherapy regimens supported by autologous hematopoietic stem cell transplantation in 45 individuals with poor-prognosis and relapsed germ cell tumors. From March 1998 to September 2001 (median follow-up, 31.8 months), 45 individuals (median age, 28 years) were enrolled. Most (76%) had testicular primaries; 13% had mediastinal primaries; 11% retroperitoneal, hepatic or unknown. A total of 22 individuals received the complete course. Twenty-five individuals died from progression and 5 from toxicity. The overall response rate was 37.7%, including an 8.9% complete response rate. The median OS was 11.8 months. The 3-year survival and progression-free survival rate was 23.5%. The authors used the “Beyer” prognostic score to predict the outcome of high-dose chemotherapy and concluded that those with a Beyer score greater than two did not benefit from this approach, confirming that highly refractory cases and particularly those with resistant/refractory primary mediastinal germ cell tumors do not benefit from high-dose chemotherapy. The authors also stated that better selection criteria have to be fulfilled in forthcoming studies.

Feldman and colleagues (2010) studied the efficacy of the TI-CE regimen consisting of paclitaxel [T] plus ifosfamide [I] followed by three high-dose cycles of carboplatin [C] plus etoposide [E] with stem-cell support in individuals with germ cell tumors predicted to have a poor prognosis with conventional-dose salvage therapy. A total of 107 individuals with advanced GCTs with progressive disease post chemotherapy and unfavorable prognostic features (extragonadal primary site, incomplete response [IR] to first-line therapy, or relapse/IR to ifosfamide-cisplatin-based conventional-dose salvage) participated in this prospective, single-institution, phase II trial. The major findings included a 52% 5-year OS and 47% 5-year DFS. Among the 107 participants, 50 deaths occurred including 2 (2%) treatment-related deaths (grade 5 toxicities). The treatment related deaths consisted of one fatal cerebral hemorrhage and one fatal pulmonary hemorrhage. In addition, all participants experienced grade 4 neutropenia.

Further research is needed surrounding the treatment of relapsed/refractory metastatic germ cell tumors and additional study is planned (Feldman, 2011; Rashid, 2012; Tan, 2019). In the NCCN clinical practice guideline (CPG) for testicular cancer (V1.2023) the Panel concludes that it is not currently known whether high-dose chemotherapy is better than conventional-dose chemotherapy in the second-line setting for patients with relapsed disease, the NCCN Panel recommends clinical trial enrollment for these participants. An international group of investigators will compare conventional-dose therapy consisting of paclitaxel, ifosfamide, and cisplatin (TIP) with sequential high-dose therapy (TI-CE with stem-cell support) for relapsed/refractory germ cell tumors in a global randomized prospective trial (TIGER trial). Subjects who have failed initial cisplatin-based therapy will be eligible and all prognostic groups are to be included. The primary endpoint will be OS and approximately 420 participants will be required over 4 years. As a result of this phase 3 study, investigators plan to answer questions and resolve uncertainties that exist surrounding the treatment of relapsed/refractory germ cell tumors. At the time of this writing, the TIGER trial (NCT02375204) is still recruiting participants with an estimated enrollment of 420 individuals and primary completion date of June 2024.

Lorch and colleagues (2012) studied long-term survival rates of individuals with relapsed or refractory germ cell tumors following treatment with single or sequential high-dose chemotherapy. Between November 1999 and November 2004, 211 persons with relapsed or refractory germ cell tumors were randomly assigned to treatment with either one cycle of cisplatin 100 mg/m², etoposide 375 mg/m², and ifosfamide 6 g/m² (VIP) plus three cycles of high-dose carboplatin 1500 mg/m² and etoposide 1500 mg/m² (CE, arm A) or three cycles of VIP plus one cycle of high-dose carboplatin 2200 mg/m², etoposide 1800 mg/m², and cyclophosphamide 6400 mg/m² (CEC, arm B) followed by autologous stem-cell re-infusion (Lorch, 2007). Long-term PFS and OS were compared 6 years after the last person was randomized. Overall, 108 and 103 individuals were randomly assigned to arms A and B, respectively. The study was terminated prematurely due to excess treatment-related mortality in arm B (14%) compared with that in arm A (4%). As of December 2010, 9 (5%) of 211 subjects were lost to follow-up; 94 (45%) of 211 remained alive and 88 (94%) of 94 were progression free. At 5 years, PFS was 47% in arm A and 45% in arm B and OS was 49% in arm A and 39% in arm B.

In a small retrospective case series, Lewin and colleagues (2014) analyzed records of 17 men from a single Australian center who received HDCT with autologous stem cell transplantation for relapsed germ cell tumors. Baseline characteristics, treatment-related toxicity and survival were analyzed. Median age was 34 (21-46), with 41% having primary refractory disease and 53% with high/very high risk disease. Two subjects received two cycles and 15 received three cycles of HDCT-autologous stem cell transplantation. The most commonly used regimen was paclitaxel/ifosfamide followed by high-dose carboplatin/etoposide (TI-CE; n=12). The median duration of grade 4 (G4) neutropenia was 11 days (range 9-17) with febrile neutropenia in 90% resulting in four intensive care unit admissions (8%). Median duration of G4 thrombocytopenia was 10 days (range 8-19) requiring a median of two pooled platelets bags (range 0-33) per episode. Transplant-related mortality occurred in 1 individual (veno-occlusive disease). Twenty-seven per cent of HDCT-autologous stem cell cycles were associated with grade 3 mucositis. Two-year PFS and OS rates were 59% and 71%. Subjects who received HDCT-autologous stem cell transplantation as second or subsequent relapse fared worse than those treated with HDCT-autologous stem cell transplantation at first relapse. Three-year OS for those who received TI-CE at first relapse was 90%. This case series was limited by a small sample size.

Other Considerations

The NCCN (V1.2023) CPG for testicular cancer assigns a 2A recommendation to the second-line/third-line chemotherapy regimen consisting of paclitaxel, ifosfamide, carboplatin, and etoposide administered with peripheral blood stem cell support at 14-21 day intervals for three cycles. The NCCN 2A category is based upon lower-level evidence and uniform NCCN consensus that the intervention is appropriate.

In 2015, the American Society for Blood and Marrow Transplantation (Majhail and colleagues) issued guidelines for autologous and allogeneic hematopoietic cell transplantation. Definitions used for classifying indications were: standard of care (S); standard of care, clinical evidence available (C); standard of care, rare indication (R); Developmental (D); and not generally recommended (N). Indications for hematopoietic cell transplantation in adults (generally 18 years of age and above) include the following classifications for germ cell tumors:

• Germ cell tumor, relapse (N for allogeneic, C for autologous)
• Germ cell tumor, refractory (N for allogeneic, C for autologous)

Indications for hematopoietic cell transplantation in children (generally less than 18 years of age) include the following classifications for germ cell tumors:

• Germ cell tumor, relapse (D for allogeneic, C for autologous)
• Germ cell tumor, refractory (D for allogeneic, C for autologous)

Hematopoietic stem cell transplant (HSCT) is an important therapeutic modality for many malignant and nonmalignant hematologic diseases and its applicability continues to expand as its use in established therapies is refined and new indications are identified. In addition, the number of individuals who could benefit from HSCT has increased due to advancements, such as reduced intensity conditioning regimens, which have made HSCT safer (Majhail, 2015). However, the risks associated with transplant-associated morbidity and mortality remain significant. Most transplant centers utilize forums, boards or conferences where the treatment options of individual HSCT candidates are discussed (Majhail, 2015). Okamoto (2017) notes:

The medical decision-making process for a transplant procedure is complex which requires assessing several factors besides the underlying indication for transplantation. Those include patient/disease factors, and transplant factors such as planed conditioning/graft-versus-host disease (GVHD) prophylaxis and stem cell source. Patient factors include their overall health and comorbidities, prior therapies, and how patients responded to those therapies, age, and disease/disease risk.

There are a number of clinical assessment and prognostic tools which evaluate individuals based upon multiple factors. The earlier, simpler tools, such as the Charlson Comorbidity Index (CCI) were useful in predicting outcomes, but lacked the sensitivity of subsequent tools such as the HCT-specific comorbidity index (HCT-CI) The HCT-CI score has been validated in multiple HSCT settings to independently predict non-relapse mortality (NRM) rates by weighting 17 relevant comorbidities. The HCT-CI was further enhanced by the incorporation of some laboratory biomarkers into an augmented version. While these tools provide valuable prognostic information, the decision to transplant is unique to each individual and needs to include a specific risk-benefit analysis in partnership with the individual’s physicians and other caregivers.

Summary

At this time there is insufficient evidence to support the efficacy of high-dose chemotherapy with allogeneic stem cell transplant or non-myeloablative conditioning regimens as treatment of germ cell tumors. Additionally, there is insufficient evidence to support the efficacy of three or more cycles of autologous stem cell support.

There are no data from controlled studies that investigated the efficacy of planned cycles (tandem) of HDC followed by stem cell support (auto/auto or auto/allo) for the treatment of germ cell tumors other than in individuals with testicular cancer that meet specified criteria. Therefore, conclusions regarding the net efficacy of such planned tandem protocols could not be reached.

Germ cell tumors are usually treated with one or a combination of modalities including surgery, chemotherapy and radiation therapy. Treatment is determined by the histology and stage of disease in combination with other factors. Autologous stem cell transplantation has been utilized as a salvage therapeutic option.

Testicular cancer is a disease in which cells in one or both testicles become cancerous and begin to grow uncontrollably. Seminomas and non-seminomas are the two main types of testicular germ cell tumors. If not treated or removed, these cancerous cells will eventually form a growth or tumor that can spread to other parts of the body. Testicular cancer most often develops in young and middle aged men and is highly treatable if detected early. According to the National Cancer Institute (NCI), in 2022, approximately 9910 new cases of testicular cancer will be diagnosed in the United States.

Ovarian cancers may arise from different cell lines. Ovarian germ cell tumors include dysgerminoma. According to the American Cancer Society (ACS), in 2022, approximately 19,880 new cases of ovarian cancer will be diagnosed in the United States and 12,810 estimated deaths. Ovarian germ cell tumors are aggressive and uncommon tumors often occurring in young women and adolescent girls. If the tumor is identified and treated early, it can be curable.

High-dose chemotherapy (HDC) involves the administration of cytotoxic agents using doses several times greater than the standard therapeutic dose. In some cases, whole body or localized radiotherapy is also given and is included in the term HDC when applicable. The rationale for HDC is that many cytotoxic agents act according to a steep dose-response curve. Thus, small increments in dosage will result in relatively large increases in tumor cell kill. Increasing the dosage also increases the incidence and severity of adverse effects related primarily to bone marrow ablation (for example, opportunistic infections, hemorrhage, or organ failure). Bone marrow ablation is the most significant side effect of HDC. As a result, HDC is accompanied by a re-infusion of hematopoietic stem cells, which are primitive cells capable of replication and formation into mature blood cells, in order to repopulate the marrow. The potential donors of stem cells include:

1. Autologous - Stem cells can be harvested from the individual’s own bone marrow or peripheral blood
2. Allogeneic - Stem cells harvested from a histocompatible donor

(Note: this document does not require a specific level of histocompatibility be present as part of the medical necessity evaluation)

Donor stem cells, either autologous or allogeneic, can be collected from either the bone marrow or the peripheral blood. Stem cells may be harvested from the peripheral blood using a pheresis procedure. To increase the number of stem cells in the peripheral circulation, donors may be pretreated with a course of chemotherapy or hematopoietic growth factors, or both.

In addition, blood harvested from the umbilical cord and placenta shortly after delivery of neonates contains stem and progenitor cells. Although cord blood is an allogeneic source, these stem cells are antigenically “naïve” and thus, are associated with a lower incidence of rejection or graft versus host disease.

Immunologic compatibility between donor and recipient is a critical factor for achieving a good outcome of allogeneic bone marrow transplantation. Compatibility is established by typing of human leukocyte antigens (HLA) using cellular, serologic, or molecular techniques. HLA refers to the tissue type expressed at the HLA A, B, and DR loci on the long arm of chromosome 6. 

The most appropriate stem cell source for a particular individual depends upon his or her disease, treatment history, and the availability of a compatible donor. The most appropriate source of stem cells for each individual must balance the risks of graft failure and re-infusion of malignant cells in autologous procedures, the risks of graft rejection, and graft versus host disease in allogeneic procedures.

Tandem high-dose or non-myeloablative chemotherapy with autologous or allogeneic stem cell support is the planned administration of two cycles of high-dose chemotherapy, alone or with total body irradiation, each of which is followed by re-infusion of stem cells. Despite treatment with high-dose chemotherapy, many individuals with advanced malignancies eventually relapse, indicating the presence of residual neoplastic cells. The hypothesis is that eradication of residual tumor cells can be achieved using multiple cycles of myeloablative or non-myeloablative chemotherapy with stem cell support.

Ablative: A very high dose of a treatment, calculated to kill a tumor.

Allogeneic stem cells: Stem cells harvested from a histocompatible donor.

Autologous stem cells: Stem cells harvested from the individual’s own bone marrow or peripheral blood.

Bone marrow: A spongy tissue located within flat bones, including the hip and breast bones and the skull. This tissue contains stem cells, the precursors of platelets, red blood cells, and white cells.

Chemosensitive: Showing tumor response to the most recent chemotherapy regimen.

Chemotherapy: The medical treatment of a disease, particularly cancer, with drugs or other chemicals. Chemotherapy may vary by disease and stage.

Chimerism: Cell populations derived from different individuals; may be mixed or complete.

Complete response/remission (CR): The disappearance of all signs of cancer in response to treatment; this does not always mean the cancer has been cured; also called a complete response.

Cytotoxic: Destructive to cells.

ECOG (Eastern Cooperative Oncology Group) Performance Status: A scale used to determine the individual’s level of functioning; this scale may also be referred to as the WHO (World Health Organization) or Zubrod score; based on the following scale:

Failure to engraft: When the bone marrow infused during a bone marrow transplant does not take or is not accepted by the recipient.

Graft versus host disease: A life-threatening complication of bone marrow transplants in which the donated marrow causes an immune reaction against the recipient’s body.

Hematopoietic stem cells: Primitive cells capable of replication and formation into mature blood cells in order to repopulate the bone marrow.

High-dose or myeloablative chemotherapy (HDC): The administration of cytotoxic agents using doses several times greater than the standard therapeutic dose.

HLA (human leukocyte antigen): A group of protein molecules located on bone marrow cells that can provoke an immune response.

Karnofsky Score: A measure of the individual’s overall physical health, judged by their level of activity; the score uses the following scale:

Lansky Score: A measure of the individuals overall physical health, judged by their level of activity; the score uses the following scale:

Non-myeloablative chemotherapy: Less intense chemotherapy conditioning regimens, which rely more on immunosuppression than cytotoxic effects to permit engraftment of donor cells.

Partial response: Showing at least a 50% reduction in tumor burden.

Poor prognosis (germ cell tumor): There is no poor prognosis or poor risk disease in the seminoma category of germ cell tumors. In nonseminoma, poor prognosis or poor risk disease is indicated by any one of the following: mediastinal primary tumor, nonpulmonary visceral metastases, and elevation of any one post-orchiectomy marker (alpha fetal protein (AFP) greater than 10,000 ng/mL, human choriogonadotropin (hCG) greater than 50,000 IU/L, or lactate dehydrogenase (LDH) greater than 10 times the upper limit of normal).

Primary graft failure: Occurs when the bone marrow infused during a bone marrow transplant does not take or is not accepted by the recipient.

Refractory: Tumors that show less than 50% reduction in tumor burden in response to chemotherapy upon or during the course(s) of chemotherapy.

Relapse: The return of signs and symptoms of cancer after a period of improvement.

Tandem transplant: Planned infusion (transplant) of previously harvested hematopoietic stem cells with a repeat hematopoietic stem cell infusion (transplant) that is performed within 6 months of the initial transplant. This is distinguished from a repeat transplantation requested or performed more than 6 months after the first transplant, and is used as salvage therapy after failure of initial transplantation or relapsed disease.

The following codes for treatments and procedures applicable to this document are included below for informational purposes. Inclusion or exclusion of a procedure, diagnosis or device code(s) does not constitute or imply member coverage or provider reimbursement policy. Please refer to the member’s contract benefits in effect at the time of service to determine coverage or non-coverage of these services as it applies to an individual member.

When services may be Medically Necessary when criteria are met:

When services are Investigational and Not Medically Necessary:
For the procedure codes listed above when criteria are not met or when the code describes a procedure indicated in the Position Statement section as investigational and not medically necessary.

When Services are also Investigational and Not Medically Necessary:
For the procedure and diagnosis codes listed below when describing a procedure indicated in the Position Statement section as investigational and not medically necessary.

Peer Reviewed Publications:

1. Adra N, Abonour R, Althouse SK, et al. High-dose chemotherapy and autologous peripheral-blood stem-cell transplantation for relapsed metastatic germ cell tumors: the Indiana University experience. J Clin Oncol. 2017; 35(10):1096-1102.
2. Ayash LJ, Clarke M, Silver SM, et al. Double dose-intensive chemotherapy with autologous stem cell support for relapsed and refractory testicular cancer: the University of Michigan experience and literature review. Bone Marrow Transplant. 2001; 27(9):939-947.
3. Bhatia S, Abonour R, Porcu P, et al. High-dose chemotherapy as initial salvage chemotherapy in patients with relapsed testicular cancer. JCO. 2000; 18(19):3346-3351.
4. Daugaard G, Skoneczna I, Aass N, et al. A randomized phase III study comparing standard dose BEP with sequential high-dose cisplatin, etoposide, and ifosfamide (VIP) plus stem-cell support in males with poor-prognosis germ-cell cancer. An intergroup study of EORTC, GTCSG, and Grupo Germinal (EORTC 30974). Ann Oncol. 2011; 22(5):1054-1061.
5. de Giorgi U, Papiani G, Severini G, et al. High-dose chemotherapy in adult patients with germ cell tumors. Cancer Control. 2003; 10(1):48-56.
6. Droz JP, Kramar A, Biron P, et al., for the Genito-Urinary Group of the French Federation of Cancer Centers (GETUG). Failure of high-dose cyclophosphamide and etoposide combined with double-dose cisplatin and bone marrow support in patients with high-volume metastatic nonseminomatous germ-cell tumours: mature results of a randomised trial. Eur Urol. 2007; 51(3): 739-746.
7. Einhorn LH. Curing metastatic testicular cancer. PNAS. 2002; 99(7):4592-4595.
8. Einhorn LH, Williams SD, Chamness A, et al. High-dose chemotherapy and stem-cell rescue for metastatic germ-cell tumors. N Engl J Med. 2007; 357(4):340-348.
9. Feldman DR, Huddart R, Hall E, et al. Is high dose therapy superior to conventional dose therapy as initial treatment for relapsed germ cell tumors? The TIGER Trial. J Cancer. 2011; 2:374-377.
10. Feldman DR, Sheinfeld J, Bajorin DF, et al. TI-CE high-dose chemotherapy for patients with previously treated germ cell tumors: results and prognostic factor analysis. J Clin Oncol. 2010; 28(10):1706-1713.
11. Lewin J, Dickinson M, Voskoboynik M, et al. High-dose chemotherapy with autologous stem cell transplantation in relapsed or refractory germ cell tumours: outcomes and prognostic variables in a case series of 17 patients. Intern Med J. 2014; 44(8):771-778.
12. Lorch A, Kleinhans A, Kramar A, Sequential versus single high-dose chemotherapy in patients with relapsed or refractory germ cell tumors: long-term results of a prospective randomized trial. J Clin Oncol. 2012; 30(8):800-805.
13. Lorch A, Kollmannsberger C, Hartmann JT, et al; German Testicular Cancer Study Group. Single versus sequential high-dose chemotherapy in patients with relapsed or refractory germ cell tumors: a prospective randomized multicenter trial of the German Testicular Cancer Study Group. J Clin Oncol. 2007; 25(19):2778-2784.
14. Lotz JP, Bui B, Gomez F et al. Sequential high-dose chemotherapy protocol for relapsed poor prognosis germ cell tumors combining two mobilization and cytoreductive treatments followed by three high-dose chemotherapy regimens supported by autologous stem cell transplantation. Results of the phase II multicentric TAXIF trial. Ann Oncol 2005; 16(3):411-418.
15. Majhail NS, Farnia SH, Carpenter PA, et al. Indications for Autologous and Allogeneic Hematopoietic Cell Transplantation: Guidelines from the American Society for Blood and Marrow Transplantation. Biol Blood Marrow Transplant. 2015; 21(11):1863-1869.
16. Margolin KA, Doroshow JH, Frankel P, et al. Paclitaxel-based high dose chemotherapy with autologous stem cell rescue for germ cell cancer. Biol Blood Marrow Transplant. 2005; 11(11):903-911.
17. Motzer RJ, Nichols CJ, Margolin KA, et al. Phase III randomized trial of conventional-dose chemotherapy, with or without high-dose chemotherapy and autologous hematopoietic stem-cell rescue as first-line treatment for patients with poor-prognosis metastatic germ cell tumors. J Clin Oncol. 2007; 25: 247-256.
18. No authors listed. Ongoing Clinical Trials in Testicular Cancer: the TIGER Trial. Oncol ResTreat. 2016; 39(9): 553-556.
19. Okamoto S. Current indications of hematopoietic cell transplantation in adults. Hematol Oncol Stem Cell Ther. 2017; 10(4):178-183.
20. Rashid S, Lim L, Powles T. Treatment of relapsed/refractory germ cell tumours: an equipoise between conventional and high dose therapy. Curr Treat Options Oncol. 2012; 13(2):201-211.
21. Seftel MD, Paulson K, Doocey R, et al. Long-term follow-up of patients undergoing auto-SCT for advanced germ cell tumour: a multicentre cohort study. Bone Marrow Transplant. 2011; 46(6):852-857.
22. Sorror ML, Maris MB, Storb R, et al. Hematopoietic cell transplantation (HCT)-specific comorbidity index: a new tool for risk assessment before allogeneic HCT. Blood. 2005; 106(8):2912-2919.
23. Suleiman Y, Siddiqui BK, Brames MJ, et al. Salvage therapy with high-dose chemotherapy and peripheral blood stem cell transplant in patients with primary mediastinal nonseminomatous germ cell tumors. Biol Blood Marrow Transplant. 2013; 19(1):161-163.
24. Tan YY, Al-Bubseeree B, Irvine D, et al. High-dose chemotherapy in relapsed or refractory metastatic germ-cell cancer: The Scotland Experience. Clin Genitourin Cancer. 2019; 17(2):125-131.
25. Zschabitz S, Distler FA, Krieger B, et al. Survival outcomes of patients with germ cell tumors treated with high-dose chemotherapy for refractory or relapsing disease. Oncotarget. 2018; 9(32):22537-22545.

Government Agency, Medical Society, and Other Authoritative Publications:

1. Alliance for Clinical Trials in Oncology. Standard-Dose Combination Chemotherapy or High-Dose Combination Chemotherapy and Stem Cell Transplant in Treating Patients With Relapsed or Refractory Germ Cell Tumors. NLM Identifier: NCT02375204. Last updated August 31, 2023. Available at: https://www.clinicaltrials.gov/ct2/show/NCT02375204?term=NCT02375204&rank=1. Accessed on September 28, 2023.
2. American Cancer Society. Cancer facts & figures 2022. Atlanta: American Cancer Society; 2022. Available at: https://www.cancer.org/research/cancer-facts-statistics/all-cancer-facts-figures/cancer-facts-figures-2022.html. Accessed on September 22, 2023.
3. Centers for Medicare and Medicaid Services. National Coverage Determination for Stem Cell Transplantation. NCD #110.23 (formerly110.8.1). Effective January 27, 2016. Available at: http://www.cms.hhs.gov/mcd/index_list.asp?list_type=ncd. Accessed on September 22, 2023.
4. Majhail NS, Farnia SH, Carpenter PA, et al. Indications for autologous and allogeneic hematopoietic cell transplantation: Guidelines from the American Society for Blood and Marrow Transplantation. Biol Blood Marrow Transplant. 2015; 21(11):1863-1869.
5. NCCN Clinical Practice Guidelines in Oncology™. ^© 2023 National Comprehensive Cancer Network, Inc. For additional information visit the NCCN website: http://www.nccn.org/index.asp. Accessed on September 22, 2023.
   • Ovarian Cancer/Fallopian Tube Cancer/Primary Peritoneal Cancer (V.5.2022). September 16, 2022.
   • Testicular Cancer (V.1.2023). January 26, 2023.

1. American Cancer Society (ACS). Available at: https://www.cancer.org. Accessed on September 22, 2023.
2. National Cancer Institute. Bone Marrow Transplantation and Peripheral Blood Stem Cell Transplantation: Questions and Answers. Reviewed August 12, 2013. Available at: http://www.cancer.gov/cancertopics/factsheet/Therapy/bone-marrow-transplant. Accessed on September 22, 2023.
3. National Cancer Institute (NCI). Available at: https://www.cancer.gov/types. Accessed on September 22, 2023.
   • Extragonadal Germ Cell Tumors Treatment (PDQ^®). Modified February 25, 2015.
   • Ovarian Germ Cell Tumors Treatment (PDQ^®). Modified July 8, 2022.
   • Testicular Cancer Treatment (PDQ^®). Modified March 9, 2023.

Hematopoietic Stem Cell Transplant
Mini-Transplant
Non-Myeloablative Stem Cell Transplant
Peripheral Blood Stem Cell
Stem Cell Support (SCS)
Stem Cell Transplant (SCT)