Trial Of Paricalcitol and Cholecalciferol(Vitamin D3) in the Treatment Of Secondary Hyperparathyroidism in Patients After ROUX-EN-Y Gastric Bypass Surgery
Condition: Gastric Bypass; Parathyroid Hormone
MeSH terms: Hyperparathyroidism; Hyperparathyroidism, Secondary
Intervention: Paricalcitol; Cholecalciferol; Placebo
Intervention description: 1 microgram by mouth daily for 6 weeks; 5000 IU (international units) by mouth daily for 6 weeks; Inactive substance, one capsule daily for 6 weeks
Intervention MeSH terms: Cholecalciferol; Vitamin D
Phase: Phase 3
Study type: Interventional
Primary purpose: Treatment
Allocation: Randomized
Intervention model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Enrollment: 49.0
Sex: All
Minimum age: 18 Years
Maximum age: 100 Years
Healthy volunteers: Accepts Healthy Volunteers
Keywords: PTH; Gastric bypass surgery; vitamin D; paricalcitol

Summary:

      Evaluate the efficacy of paricalcitol, cholecalciferol, and placebo in the reduction of
      parathyroid hormone in patients after Roux-en-Y gastric bypass surgery (RYGB). Assess
      changes, if any, in measures of self-assessed well-being attributable to paricalcitol after
      RYGB. Evaluate the rates of hypercalcemia, kidney stones, gastrointestinal side effects, and
      other organ system adverse effects of paricalcitol, cholecalciferol, and placebo in patients
      after RYGB
    

Eligibility criteria:

        Inclusion Criteria:

          -  1. Subject has voluntarily signed and dated an informed consent form, approved by an
             Institutional Review Board (IRB), after the nature of the study has been explained and
             the subject has had the opportunity to ask questions. The informed consent must be
             signed before any study-specific procedures are performed.

             2. Must be post bariatric (> 6 weeks and ≤ 5 years) Rou-en-Y gastric bypass surgical
             patient.

             3. Male or female subjects > 18 years. 4. For entry into the Treatment Period the
             subject must satisfy the following criteria based on the existing laboratory values
             previously drawn on clinical grounds:

               -  Serum calcium level 8.0-10.5 mg/dL

               -  Phosphorous level < 5.2 mg/dL (1.68 mmol/L)

               -  Serum albumin > 3.0 g/dL (30 g/L). 5. For entry into the Treatment Period the
                  subject must satisfy the following criteria based on screening laboratories
                  (Beaumont Reference Laboratories, screening laboratory values are not blinded):

               -  iPTH > 69 pg/ml

               -  Negative serum pregnancy test for female subjects of childbearing potential. 6.
                  In the opinion of the investigator, the subject must be receiving optimal medical
                  management of other co morbidities including but not limited to HTN, DM, CVD,
                  liver disease, and lung disease.

                  7. If female, subject is not breast feeding or is not pregnant (verified by
                  negative pregnancy test prior to the Treatment Period); or is not of childbearing
                  potential, defined as postmenopausal for at least one year or surgically sterile
                  (bilateral tubal ligation, bilateral oophorectomy or hysterectomy); or is of
                  childbearing potential and practicing one of the following methods of birth
                  control:

               -  Double-barrier method (any two of the following: condoms, contraceptive sponge,
                  diaphragm, vaginal ring with spermicidal jellies or creams, or intrauterine
                  device [IUD])

               -  Hormonal contraceptives (oral, parenteral, or transdermal) for at least three
                  months prior to and during study drug administration

               -  Maintains a monogamous relationship with a vasectomized partner

               -  Total abstinence from sexual intercourse during the study (minimum one complete
                  menstrual cycle prior to study start)

        Exclusion Criteria:

          -  . Subject has previously been on active vitamin D therapy (calcitriol, paricalcitol,
             doxercalciferol, alfacalcidol) within the 30-day washout period prior to the Treatment
             Period at doses greater than 1200 IU of vitamin D3 or equivalent.

             2. Subject has a history of an allergic reaction or significant sensitivity to
             paricalcitol or to drugs similar to the study drug (i.e., vitamin D or vitamin D
             related compounds).

             3. Pregnant (confirmed by screening pregnancy test) or lactating females. 4. Subject
             is expected to initiate renal replacement therapy within one year. 5. Known history of
             hypercalcemia (>10.5 mg/dl), hyperphosphatemia (>6 mg/dl) primary hyperparathyroidism,
             or history of end-stage renal disease requiring renal replacement therapy.

             6. Full remission from a malignancy for less than one year (except completely excised
             non-Melanoma skin cancer e.g., basal or squamous carcinoma) or any history of bone
             metastasis.

             7. Subject has co-morbid conditions (e.g., advanced malignancy, advanced liver
             disease) with a life expectancy less than 1 year.

             8. Subject has received any investigational drug within 30 days prior to study drug
             administration or is currently enrolled in another clinical trial.

             9. Subject has a history of active kidney stones within the 2 years prior to the
             Screening Period.

             10. Subject has poorly controlled hypertension (systolic blood pressure > 180 mmHg
             and/or diastolic blood pressure > 110 mmHg at the Screening Visit (confirmed by
             repeat).

             11. Subject has history of renal artery stenosis, primary aldosteronism or
             pheochromocytoma, 12. Subject is taking calcitonin, bisphosphonates, cinacalcet,
             glucocorticoids (except topical or inhaled glucocorticoids), or other drugs that may
             affect calcium or bone metabolism, other than aluminum, calcium and non-calcium
             containing phosphate binders or female subjects on stable (same dose and product for
             three months) estrogen and/or progestin therapy.

             13. Subject is currently receiving immunosuppressant therapy and/or high doses
             (non-maintenance therapy) of glucocorticoids (> 5 mg/day of prednisone or equivalent).

             14. Subject has had acute renal failure within 12 weeks of the Screening Phase defined
             by an acute rise in serum Cr (of at least 0.5 mg/dL or 44 micromoles/L) to more than 4
             g/dL (350 micromoles/L).

             15. Subject is known to be HIV positive. 16. Use of known inhibitors (i.e.,
             ketoconazole) or inducers (i.e., carbamazepine) of cytochrome P450 3 A (CYP3 A) within
             two weeks prior to study drug administration.

             17. For any reason, subject is considered by the Investigator to be an unsuitable
             candidate to receive paricalcitol capsules or is put at risk by study procedures.

             18. Subject has a history of drug or alcohol abuse within six months prior to
             screening.

             19. Subject has had a liver or kidney transplant. 20. Stage V CKD subjects on renal
             replacement therapy are explicitly excluded. 21. Subject has had a CVA within the last
             3 months.