Inclusion Criteria: 

Histologic Documentation

• Advanced (stage IIIB or IV) non-small cell lung cancer diagnosed by biopsy of the primary or metastatic site. (AJCC 7.0.^92)
• No known presence of known EGFR or EML4-ALK driver mutations in the tumor.
• Started first-line systemic therapy of the investigator’s choice within 12 weeks prior to registration, or planning to initiate first-line systemic therapy of the investigator’s choice within 4 weeks after registration. No planned initiation of definitive (potentially curative) concurrent chemo-radiation.
• No prior systemic therapy for advanced NSCLC, including chemotherapy, targeted therapy or immunotherapy (other than current treatment). Prior palliative radiation permitted; prior adjuvant systemic therapy /radiation is permitted.
• No more than 7 days of prior use of mixed opioid agonist/opioid antagonists or other opioid antagonists within 4 weeks before registration. Patients should not receive such medications after registration and for the entire duration of study treatment.
• No methadone within 4 weeks prior to registration.
• Patients must have used opioid medication(s) for pain at some time in the 4 weeks prior to registration. Current use of opioids (at the time of registration) and/or later during the course of the study is permitted but not required.
• Expected survival > 3 months.
• No concurrently active second invasive malignancies except non-melanoma skin cancer.
• No history of gastrointestinal obstruction, or conditions that increase the risk of gastrointestinal obstruction, perforation, bleeding or impairment of the gastrointestinal wall. No abdominal surgery within 60 days of registration.
• No acute gastrointestinal conditions, such as: obstruction, fecal impaction, obstipation, acute surgical abdomen, ongoing need for manual maneuvers to induce bowel movements (such as digital evacuation).
• No conditions that may compromise blood-brain barrier permeability (e.g., multiple sclerosis, recent brain trauma, Alzheimer’s disease, or uncontrolled seizures).
  • No symptomatic and untreated brain metastases. Patients will be eligible for study if radiation therapy for brain metastases was completed at least 7 days prior to registration.
  • Patients having received stereotactic radiation will be eligible if the radiation was completed at least 7 days prior to registration.
  • Patients having undergone surgical resection of brain metastases will be eligible after they have healed and recovered from the surgical intervention sufficiently to start systemic treatment for NSCLC, as determined by a neurosurgeon.
  • No known leptomeningeal carcinomatosis.
• No history of myocardial infarction ≤ 6 months prior to registration. No current symptomatic congestive heart failure, uncontrolled angina or uncontrolled cardiac arrhythmias.
• No severe hepatic impairment (Child-Pugh class C) or acute liver disease.
• No known serious or severe hypersensitivity reaction to naloxegol or any of its excipients.
• No concurrent use of moderate/strong CYP3A4 inhibitors, or strong CYP3A4 inducers.
• Not pregnant and not nursing, because this study involves an investigational agent whose genotoxic, mutagenic and teratogenic effects on the developing fetus and newborn are unknown.
• Therefore, for women of childbearing potential only, a negative pregnancy test done ≤ 7 days prior to registration is required. A female of childbearing potential is a sexually mature female who: 1) has not undergone a hysterectomy or bilateral oophorectomy; or 2) has not been naturally postmenopausal for at least 12 consecutive months (i.e., has had menses at any time in the preceding 12 consecutive months).
• Age ≥ 18 years old.
• ECOG Performance Status 0-2.
• Required Initial Laboratory Values:
• Absolute Neutrophil Count (ANC)
  • ≥ 1,500/mm^3.
• Platelet Count
  • ≥ 100,000/mm^3.
• Calc. Creatinine Clearance
  • ≥ 60 mL/min *.
• Total Bilirubin
  • ≤ 1.2 x upper limit of normal (ULN)**.
• AST and ALT
  • ≤ 2.5 x upper limit of normal (ULN).

* Calculated using the Cockcroft-Gault formula.
**Unless due to Gilbert’s disease.