Vitamin d and malaria drug join forces against pancreatic cancer

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Patients must have histologically confirmed advanced or metastatic adenocarcinoma of the pancreas (stage IV) * Patients must have measurable disease as defined by Response Evaluation Criteria in Solid Tumors (RECIST) criteria 1.1 as at least one lesion that can be accurately measured in at least one dimension (longest diameter to be recorded as \>= 10 mm (\>= 1 cm) on computed tomography (CT) scan, magnetic resonance imaging (MRI) * Patients may have had prior neoadjuvant or adjuvant treatment for pancreatic cancer. The last dose of chemotherapy must have been 12 months prior to study entry. No prior systemic therapy for metastatic disease * Eastern Cooperative Oncology Group (ECOG) performance status =\< 2 (Karnofsky \>= 60%) * Hemoglobin \>= 9.0 g/dl (no transfusions allowed within 7 days of cycle 1 day 1 to meet entry criteria) (within 28 days of cycle 1 day 1) * Absolute neutrophil count (ANC) \>= 1,500/mcL (after at least 7 days without growth factor support or transfusion) (within 28 days of cycle 1 day 1) * Platelets \>= 100,000/mcL (no transfusions allowed within 7 days of cycle 1 day 1 to meet entry criteria) (within 28 days of cycle 1 day 1) * International normalized ratio (INR) =\< 1.5 (within 28 days of cycle 1 day 1) * Partial thromboplastin time (PTT) \< 1.5 x upper limits of normal (ULN) (within 28 days of cycle 1 day 1) * Total bilirubin =\< 1.5 times the institutional upper limit of normal (ULN) (within 28 days of cycle 1 day 1) * Aspartate aminotransferase (AST)/alanine aminotransferase (ALT) =\< 5.0 times the ULN (within 28 days of cycle 1 day 1) * Serum creatinine =\< 1.5× ULN or creatinine clearance \>= 60 mL/min/1.73 m\^2 for patients with creatinine levels \> 1.5 x ULN. Creatinine clearance should be calculated per institutional standard (within 28 days of cycle 1 day 1) * Calcium (corrected for albumin) =\< 1 x institutional upper limit of normal (within 28 days of cycle 1 day 1) * Patients with prior radiotherapy are acceptable. It must be at least 21 days since administration of radiation therapy and all signs of toxicity must have abated * Patient must have a primary or metastatic non-bone site that is amenable to safe biopsy. Bone only lesions are not suitable for biopsy * Patients with known G6PD deficiency, severe psoriasis, porphyria, macular degeneration or severe diabetic retinopathy are ineligible because of the potential for greater hydroxychloroquine (HCQ) toxicity * Patients with known history or current symptoms of cardiac disease, or history of treatment with cardio- toxic agents, should have a clinical risk assessment of cardiac function using the New York Heart Association Functional Classification. To be eligible for this trial, patients should be class 2B or better * The effects of study drugs used in this study on the developing human fetus are unknown. For this reason, female of child-bearing potential (FCBP) must have a negative serum or urine pregnancy test prior to starting therapy * FCBP and men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) 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 1 month after completion of drug administration * Willingness and ability of the subject to comply with scheduled visits, drug administration plan, protocol-specified laboratory tests, other study procedures, and study restrictions * Evidence of a personally signed informed consent indicating that the subject is aware of the neoplastic nature of the disease and has been informed of the procedures to be followed, the experimental nature of the therapy, alternatives, potential risks and discomforts, potential benefits, and other pertinent aspects of study participation Exclusion Criteria: * Prior chemotherapy or any other investigational agents for the treatment of metastatic pancreatic cancer * Concurrent use of any other anti-cancer therapy, including chemotherapy, targeted therapy, immunotherapy, or biological agents * History of use of HCQ (aminoquinolines) or paricalcitol in the 6 months prior to study entry * Pre-existing hypercalcemia, defined as baseline serum calcium (corrected for albumin) above the institutional upper limit of normal * After signing consent, vitamin D or calcium containing supplements must be stopped and no vitamin D or calcium supplements can be taken while the patient is enrolled to the study due to increased risk for hypercalcemia * Pre-existing, clinically significant peripheral neuropathy, defined as Common Terminology Criteria for Adverse Events (CTCAE) grade 2 or higher neurosensory or neuro-motor toxicity, regardless of etiology * Participants with uncontrolled brain metastases should be excluded from this clinical trial because of their poor prognosis and because they often develop progressive neurologic dysfunction that would confound the evaluation of neurologic and other adverse events * Current use of medications that prolong QT interval unless approved by principal investigator (PI) or substances that are strong inhibitors or inducers of CYP450 3A enzyme(s)- unless approved by PI * Uncontrolled intercurrent illness including, but not limited to, ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations that would limit compliance with study requirements * Patients with known G6PD deficiency, severe psoriasis, porphyria, macular degeneration or severe diabetic retinopathy are ineligible because of the potential for greater HCQ toxicity * Pregnant women are excluded from this study because the use of agents 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 study drugs, breastfeeding should be discontinued * Participant must be able to swallow and absorb pills