Inclusion Criteria:

- Patients must have histologically or cytologically confirmed non-small cell lung
cancer harboring an EGFR mutation; NOTE: EGFR mutational status will be known and
assays performed in Clinical Laboratory Improvement Amendments (CLIA) certified
laboratories will be accepted

- Patients should have tumor tissue available for retrieval; tissue blocks or unstained
slides from the time of original diagnosis are acceptable if repeat biopsy is not
indicated

- Patients must have measurable disease, defined as at least one lesion that can be
accurately measured in at least one dimension (longest diameter to be recorded for
non-nodal lesions and short axis for nodal lesions) as >= 20 mm with conventional
techniques or as >= 10 mm with spiral computed tomography (CT) scan, magnetic
resonance imaging (MRI), or calipers by clinical exam

- Patients must have received prior EGFR TKI therapy for metastatic disease and have
documented evidence of radiologic disease progression while on EGFR TKI as treatment
immediately prior to enrollment; (patients may have received prior chemotherapy, and
retreatment with erlotinib is allowed)

- Eastern Cooperative Oncology Group (ECOG) performance status =< 1 (Karnofsky >= 60%)

- Leukocytes >= 3,000/mcL

- Absolute neutrophil count >= 1,500/mcL

- Platelets >= 100,000/mcL

- Total bilirubin =< 1.5 × upper limit of normal (ULN)

- Aspartate aminotransferase (AST) (serum glutamic oxaloacetic transaminase
[SGOT])/alanine aminotransferase (ALT) (serum glutamate pyruvate transaminase [SGPT])
=< 3.0 × institutional upper limit of normal

- Lipase < 2.0 x ULN and no radiologic or clinical evidence of pancreatitis

- Creatinine =< 1.5 × ULN OR creatinine clearance >= 50 mL/min/1.73 m^2 for patients
with creatinine levels above institutional normal

- Hemoglobin >= 9 g/dL

- Serum albumin >= 2.8 g/dL

- Urine protein/creatinine ratio (UPCR) =< 1

- Serum phosphorus >= lower limit of normal (LLN)

- Calcium >= LLN

- Magnesium >= LLN

- Potassium >= LLN

- Women of childbearing potential must have a negative pregnancy test at screening;
women of childbearing potential include women who have experienced menarche and who
have not undergone successful surgical sterilization (hysterectomy, bilateral tubal
ligation, or bilateral oophorectomy) or are not postmenopausal; postmenopause is
defined as amenorrhea >= 12 consecutive months; note: women who have been amenorrheic
for 12 or more months are still considered to be of childbearing potential if the
amenorrhea is possibly due to prior chemotherapy, antiestrogens, ovarian suppression
or any other reversible reason

- The effects of XL184 (cabozantinib) on the developing human fetus are unknown; for
this reason and because tyrosine kinase inhibitors agents as well as other
therapeutic agents used in this trial are known to be teratogenic, women of
child-bearing potential and men must agree to use adequate contraception prior to
study entry and for the duration of study participation; should a woman become
pregnant or suspect she is pregnant while she or her partner is participating in this
study, she should inform her treating physician immediately; men treated or enrolled
on this protocol must also agree to use adequate contraception prior to the study,
for the duration of study participation, and 4 months after completion of XL184
(cabozantinib) administration; sexually active subjects (men and women) must agree to
use medically accepted barrier methods of contraception (e.g., male or female condom)
during the course of the study and for 4 months after the last dose of study drug(s),
even if oral contraceptives are also used; all subjects of reproductive potential
must agree to use both a barrier method and a second method of birth control during
the course of the study and for 4 months after the last dose of study drug(s)

- Prior to the first patient registration, this study must have institutional review
board (IRB) approval; a copy of the IRB approval for each site involved must be given
to the Data Coordinating Center at City of Hope

- Ability to understand and the willingness to sign a written informed consent document

Exclusion Criteria:

- The subject has received cytotoxic chemotherapy (including investigational cytotoxic
chemotherapy) or biologic agents (e.g., cytokines or antibodies) within 3 weeks, or
nitrosoureas/ mitomycin C within 6 weeks before the first dose of study treatment

- Prior treatment with XL184 (cabozantinib) or other MET/hepatocyte growth factor (HGF)
inhibitor

- The subject has received radiation therapy:

- To the thoracic cavity, abdomen, or pelvis within 2 weeks before the first dose
of study treatment, or has ongoing complications, or is without complete
recovery and healing from prior radiation therapy

- To bone or brain metastasis within 14 days before the first dose of study
treatment

- To any other site(s) within 28 days before the first dose of study treatment

- The subject has received prior treatment with a small molecule kinase inhibitor or a
hormonal therapy (including investigational kinase inhibitors or hormones) within 14
days or five half-lives of the compound or active metabolites, whichever is longer,
before the first dose of study treatment

- The subject has received any other type of investigational agent within 28 days
before the first dose of study treatment

- The subject has not recovered to baseline or Common Terminology Criteria for Adverse
Events (CTCAE) =< grade 1 from toxicity due to all prior therapies except alopecia
and other non-clinically significant adverse events (AEs)

- The subject has a primary brain tumor

- The subject has active brain metastases or epidural disease; subjects with brain
metastases previously treated with whole brain radiation or radiosurgery or subjects
with epidural disease previously treated with radiation or surgery who are
asymptomatic and do not require steroid treatment for at least 2 weeks before
starting study treatment are eligible; baseline brain imaging with contrast-enhanced
CT or MRI scans for subjects with known brain metastases is required to confirm
eligibility

- The subject has prothrombin time (PT)/international normalized ratio (INR) or partial
thromboplastin time (PTT) test >= 1.3 x the laboratory ULN within 7 days before the
first dose of study treatment

- The subject requires concomitant treatment, in therapeutic doses, with anticoagulants
such as warfarin or warfarin-related agents, heparin, thrombin or Factor Xa
inhibitors, or antiplatelet agents (e.g., clopidogrel); low dose aspirin (=< 81
mg/day), low-dose warfarin (=< 1 mg/day), and prophylactic low molecular weight
heparin (LMWH) are permitted

- Strong cytochrome P450 (CYP)3A4 inducers and inhibitors should be avoided; selection
of alternate concomitant medications with no or minimal CYP3A4 enzyme inhibition
potential is recommended; because the lists of these agents are constantly changing,
it is important to regularly consult a frequently-updated list such as
http://medicine.iupui.edu/clinpharm/ddis/table.aspx; medical reference texts such as
the Physicians' Desk Reference may also provide this information; as part of the
enrollment/informed consent procedures, the patient will be counseled on the risk of
interactions with other agents, and what to do if new medications need to be
prescribed or if the patient is considering a new over-the-counter medicine or herbal
product

- The subject has experienced any of the following:

- Clinically-significant gastrointestinal bleeding within 6 months before the
first dose of study treatment

- Hemoptysis of >= 0.5 teaspoon (2.5 mL) of red blood within 3 months before the
first dose of study treatment

- Any other signs indicative of pulmonary hemorrhage within 3 months before the
first dose of study treatment

- Patients with active bleeding or pathologic conditions that carry high risk of
bleeding, such as known bleeding disorder or coagulopathy

- The subject has radiographic evidence of cavitating pulmonary lesion(s)

- The subject has tumor in contact with, invading or encasing any major blood vessels

- The subject has evidence of tumor invading the gastrointestinal (GI) tract
(esophagus, stomach, small or large bowel, rectum or anus), or any evidence of
endotracheal or endobronchial tumor within 28 days before the first dose of
cabozantinib

- The subject has uncontrolled, significant intercurrent or recent illness including,
but not limited to, the following conditions:

- Cardiovascular disorders including:

- Congestive heart failure (CHF): New York Heart Association (NYHA) class III
(moderate) or class IV (severe) at the time of screening

- Concurrent uncontrolled hypertension defined as sustained blood pressure
(BP) > 140 mm Hg systolic, or > 90 mm Hg diastolic despite optimal
antihypertensive treatment within 7 days of the first dose of study
treatment

- Any history of congenital long QT syndrome

- Any of the following within 6 months before the first dose of study
treatment:

- Unstable angina pectoris

- Clinically-significant cardiac arrhythmias

- Stroke (including transient ischemic attack [TIA], or other ischemic
event)

- Myocardial infarction

- Thromboembolic event requiring therapeutic anticoagulation (Note:
subjects with a venous filter [e.g. vena cava filter] are not eligible
for this study)

- Gastrointestinal disorders particularly those associated with a high risk of
perforation or fistula formation including:

- Any of the following within 28 days before the first dose of study
treatment

- Intra-abdominal tumor/metastases invading GI mucosa

- Active peptic ulcer disease

- Inflammatory bowel disease (including ulcerative colitis and Crohn's
disease), diverticulitis, cholecystitis, symptomatic cholangitis or
appendicitis

- Malabsorption syndrome

- Any of the following within 6 months before the first dose of study
treatment:

- Abdominal fistula

- Gastrointestinal perforation

- Bowel obstruction or gastric outlet obstruction

- Intra-abdominal abscess; note: Complete resolution of an
intra-abdominal abscess must be confirmed prior to initiating
treatment with cabozantinib even if the abscess occurred more than 6
months before the first dose of study treatment

- Other disorders associated with a high risk of fistula formation including
percutaneous endoscopic gastrostomy (PEG) tube placement within 3 months before
the first dose of study therapy

- Other clinically significant disorders such as:

- Active infection requiring systemic treatment within 28 days before the
first dose of study treatment

- Serious non-healing wound/ulcer/bone fracture within 28 days before the
first dose of study treatment

- History of organ transplant

- Concurrent uncompensated hypothyroidism or thyroid dysfunction within 7
days before the first dose of study treatment

- History of major surgery as follows:

- Major surgery within 8 weeks of the first dose of cabozantinib, with
complete wound healing; (patients with ongoing wound healing or other
complications will be excluded)

- Minor surgery within 4 weeks of the first dose of cabozantinib; Pleurx
catheter placement within 7 days of the first dose of cabozantinib

- The subject is unable to swallow tablets

- The subject has a corrected QT interval calculated by the Fridericia formula (QTcF) >
500 ms within 28 days before randomization; note: if initial QTcF is found to be >
500 ms, two additional electrocardiograms (EKGs) separated by at least 3 minutes
should be performed; if the average of these three consecutive results for QTcF is =<
500 ms, the subject meets eligibility in this regard

- The subject is unable or unwilling to abide by the study protocol or cooperate fully
with the investigator or designee

- The subject has had evidence within 2 years of the start of study treatment of
another malignancy which required systemic treatment

- History of allergic reactions attributed to compounds of similar chemical or biologic
composition to XL184 (cabozantinib) or erlotinib

- Pregnant women are excluded from this study because XL184 (cabozantinib) is a
tyrosine kinase inhibitor with the potential for teratogenic or abortifacient
effects; because there is an unknown but potential risk for adverse events in nursing
infants secondary to treatment of the mother with XL184 (cabozantinib), breastfeeding
should be discontinued if the mother is treated with XL184 (cabozantinib); these
potential risks may also apply to other agents used in this study

- Human immunodeficiency virus (HIV)-positive patients on combination antiretroviral
therapy are ineligible because of the potential for pharmacokinetic interactions with
XL184 (cabozantinib); in addition, these patients are at increased risk of lethal
infections when treated with marrow-suppressive therapy; appropriate studies will be
undertaken in patients receiving combination antiretroviral therapy when indicated