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A Phase II Study of Sirolimus and Erlotinib in Recurrent/Refractory Germ Cell Tumors

Study ID: STU 092013-056

Summary

This will be a phase II study to determine the response rate of children, adolescents, and young adults with relapsed / refractory germ cell tumors to the combination of sirolimus and erlotinib. Patients will be treated with these medications daily on a continuous schedule. The initial dose of sirolimus will be 1mg/m2 daily (max 2mg) and adjusted to obtain trough plasma concentrations of 10-15ng/mL. The initial dose of erlotinib will be 85mg/m2 daily (max 150mg/day). The initial dose of erlotinib will be higher than used in the pediatric phase ii study of sirolimus and erlotinib for low grade gliomas. The dose of 65mg/m2/day used in the prior phase ii study was empirically chosen and not a defined MTD. it was very well tolerated with no grade iV or V adverse events and only two grade iii adverse events: cellulitis without neutropenia in one patient and neutropenia in one patient. The dose of 85mg/m2/day used in this study was chosen given that there are suggestions that erlotinib concentration correlates with efficacy in nSCLC patients, especially those with wildtype eGFR. Further, erlotinib clearance is faster in pediatric patients and the incidence of the on target rash is lower, both again suggesting the need for a higher dose in this population. This dose was the pediatric MTD in the Children's oncology Group phase i study of erlotinib in combination with temozolamide, and equivalent to the well tolerated adult dose of 150mg/day in the adult phase ii study of sirolimus and erlotinib. note that the maximum dose of 150mg/day is equal to the adult phase ii study and FDa approved dose, so this only represents a dose increase for pediatric patients. as there is significant inter-patient variability in the pharmacokinetics of erlotinib and drug exposure and the development of low grade rash have been shown to correlate with outcome in adult studies of this agent, patients who do not develop grade ii or greater drug-related rash (which is maximal at 2-3 weeks of therapy) or any dose limiting toxicities during cycle 1 will be dose-escalated to 120mg/m2/day (max 200mg) for the second and subsequent cycles (the MTD of erlotinib in combination with radiotherapy and approximately the MTD of single agent erlotinib (125mg/m2/day) in two studies pediatric brain tumor patients.) To assess biological correlates of efficacy, we will assess banked tumor specimens (from the enrolled patients) for evidence of mToR pathway activation by immunohistochemical staining for eRBB1 and eRBB2 receptors (peRBB2, paKT1, peRK1/2, pmToR, p70S6, and pRPS6.) expression of these targets will be correlated with response to therapy.

Participant Eligibility

Inclusion Criteria:

  • Patients must be greater than 12 months and less than 50 years of age at the time of study enrollment.
  • Patients must have had histologic verification of an extracranial germ cell tumor that is not a pure mature teratoma.
  • Patients must have sufficient tumor tissue available to allow assessment of EGFR and mTOR pathway activation (see Section 5.2.3 for sample requirements)
  • Patients must have relapsed or refractory disease following at least two prior cisplatin containing chemotherapy regimens.
  • Patients must have measurable disease, documented according to RECIST criteria, or evaluable disease with a standard tumor marker (AFP and/or HCG) greater than 10 times the upper limit of normal.
  • Patients must have a Lansky or Karnofsky performance status score of ≥ 50. Use Karnofsky for patients > 16 years of age and Lansky for patients ≤ 16 years of age.
  • Patients must have a life expectancy of greater than 8 weeks.
  • Patients must have fully recovered from the acute toxic effects of all prior anti-cancer therapy.
    • Patients must not have received myelosuppressive chemotherapy within 3 weeks of enrollment.
    • Patients must be > 7 days since treatment with hematopoetic growth factors (>14 days for Neulasta).
    • Patients must be >7 days since therapy with a biologic agent and beyond the period for which adverse events of the biologic agent are known to occur if longer.
    • Patients must be >3 half-lives since therapy with a monoclonal antibody.
    • Patients must be >42 days since completion of any immunotherapy (i.e. tumor vaccines).
    • Patients must be greater than 2 weeks since most recent palliative XRT and greater than 6 weeks since substantial bone marrow irradiation.
    • Patients must be greater than 8 weeks since prior stem cell transplant or infusion and without evidence of active graft vs. host disease.
  • Adequate bone marrow function defined as:
    • Peripheral absolute neutrophil count (ANC) of at least 1,000/ L
    • Platelet count of at least 100,000/ L (transfusion independent, defined as not receiving platelet transfusions within a 7-day period prior to enrollment)
    • Hemoglobin 8.0 g/dL (may receive RBC transfusions).
  • Adequate renal function defined as:
    • Creatinine clearance or radioisotope GFR 70 mL/min/1.73 m2 or
    • Maximum serum creatinine (mg/dL) based on age/gender
  • Adequate liver function defined as:
    • Total bilirubin ≤ 1.5 x upper limit of normal (ULN) for age
    • SGPT (ALT) ≤ 2.5 x ULN (for the purpose of this study, the ULN for SGPT is 45 U/L)
    • Serum albumin ≥ 2 g/dL.
  • Adequate central nervous system function defined as:
    • Patients with seizure disorder may be enrolled if receiving non-enzyme inducing anticonvulsants and well controlled.
  • Serum cholesterol levels must be less than Grade 2 (< 300 mg/dL), and serum triglyceride levels must be less than Grade 2 (< 2.5 x ULN).

Exclusion Criteria:

  • Patients with active brain metastases are not eligible as lethal intratumoral hemorrhages have been reported with erlotinib therapy. Patients with brain metastases that have been treated and stable for > 30 days following treatment will be eligible.
  • Patients who are pregnant or breast feeding will not be entered into the study as erlotinib is teratogenic. Pregnancy tests must be obtained in females who are post-menarchal. Post-menarchal females with HCG secreting tumors will be excluded as pregnancy can't be excluded. Males or females of reproductive potential may not participate unless they have agreed to use an effective contraceptive method for the duration of the study.
  • Concomitant medications
    • Investigational Drugs: Patients who are currently receiving another investigational drug are not eligible.
    • Anti-cancer Agents: Patients who are currently receiving other anti-cancer agents are not eligible.
    • Anticonvulsants: Patients who are receiving enzyme-inducing anticonvulsants are not eligible (see Appendix 1 for a list of enzyme- inducing anticonvulsants).
    • Anticoagulants: Use of warfarin is not allowed while on study. Patients already on warfarin should use alternative anticoagulants while on this study. Warfarin must not have been administered within 7 days of enrollment.
    • Smoking: Smoking induces CYP3A4/5 enzymes and decreases exposure to sirolimus and erlotinib. Thus, patients must not smoke for 10 days prior to enrollment and for the duration of therapy.
  • Infection: Patients who have an uncontrolled infection are not eligible.
  • Drug interactions: Sirolimus and erlotinib are primarily metabolized by the CYP3A4/5 enzymes. Drug exposure is substantially effected by CYP inhibitors (increased exposure) and inducers (decreased exposure). Thus, concomitant administration of strong CYP3A4/5 inhibitors or inducers is prohibited while on therapy. See Appendix 1 for a list of these medications. Patients must not have received these medications for a minimum of 10 days prior to enrollment.
  • Patients who have received prior therapy targeting EGFR with small molecule tyrosine kinase inhibitors or monoclonal antibodies are NOT eligible.
  • Prior treatment with mTOR or TORC1/2 inhibitors (eg, rapamycin, temsirolimus, everolimus, deferolimus) is NOT allowed.
  • Patients who have had major surgery within 3 weeks prior to enrollment are not eligible. Procedures such as placement of a central vascular catheter, or limited tumor biopsy, are not considered major surgery.
  • Patients who in the opinion of the investigator may not be able to comply with the safety monitoring requirements of the study are not eligible.
Cancer Related
Healthy Volunteers
No
UT Southwestern Principal Investigator
Theodore W Laetsch

Contact:

Alison Patterson

Alison.Patterson@childrens.com

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