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This phase II/III compares the standard therapy (chemotherapy plus cetuximab) versus adding bevacizumab to standard chemotherapy, versus combination of just bevacizumab and atezolizumab in treating patients with head and neck cancer that has spread to other places in the body (metastatic or advanced stage) or has come back after prior treatment (recurrent). Immunotherapy with monoclonal antibodies, such as atezolizumab, may help the body's immune system attack the cancer, and may interfere with the ability of tumor cells to grow and spread. Bevacizumab is in a class of medications called antiangiogenic agents. It works by stopping the formation of blood vessels that bring oxygen and nutrients to tumor. This may slow the growth and spread of tumor. Cetuximab is in a class of medications called monoclonal antibodies. It binds to a protein called EGFR, which is found on some types of cancer cells. This may help keep cancer cells from growing. Cisplatin and carboplatin are in a class of chemotherapy medications known as platinum-containing compounds. They work by killing, stopping, or slowing the growth of cancer cells. Docetaxel is in a class of chemotherapy medications called taxanes. It stops cancer cells from growing and dividing and may kill them. The addition of bevacizumab to standard chemotherapy or combination therapy with bevacizumab and atezolizumab may be better than standard chemotherapy plus cetuximab in treating patients with recurrent/metastatic head and neck cancers.

This study will validate a previously developed pediatric prognostic biomarker algorithm
aimed at improving prediction of risk for the later development of chronic graft-versus-host
disease (cGvHD) in children and young adults undergoing allogeneic hematopoietic stem cell
transplant.

By developing an early risk stratification of patients into low-, intermediate-, and
high-risk for future cGvHD development (based upon their biomarker profile, before the onset
of cGvHD), pre-emptive therapies aimed at preventing the onset of cGvHD can be developed
based upon an individual's biological risk profile.

This study will also continue research into diagnostic biomarkers of cGvHD, and begin work
into biomarker models that predict clinical response to cGvHD therapies.

The purpose of the Registry is to provide continuing evaluation and periodic reporting of
safety and effectiveness of Medtronic market-released products. The Registry data is intended
to benefit and support interests of patients, hospitals, clinicians, regulatory bodies,
payers, and industry by streamlining the clinical surveillance process and facilitating
leading edge performance assessment via the least burdensome approach.

The goal of this Open-Label Study is to evaluate the safety and tolerability of PRTH-101
alone or in combination with pembrolizumab in adults with advance or metastatic solid tumors.