A Study To Determine If Coadministration Of Tamoxifen Alters The Extent Or Rate Of Palbociclib (PD-0332991) Absorption Or Elimination In Healthy Male Volunteers

A Phase 1 Open-Label Fixed-Sequence Two-Period Crossover Study Of The Effect Of Multiple Doses Of Tamoxifen On PD-0332991 Pharmacokinetics In Healthy Male Volunteers

A single 125 mg oral dose of the investigational compound PD-0332991 will be administered alone and after steady-state dosing of tamoxifen to determine if coadministration of tamoxifen alters the plasma pharmacokinetics of PD-0332991 in healthy male volunteers.

Inclusion Criteria:

• Healthy male between the ages of 18 and 55 years of age inclusive
• Body mass index (BMI) between 17.5 and 30.5 kg/m2
• Willing and able to comply with all scheduled visits, treatment plan, laboratory tests, and other study procedures

Exclusion Criteria:

• a positive urine drug screen
• a supine systolic blood pressure >140 mm Hg, or diastolic blood pressure >90 mm H.
• Evidence or history of clinically significant hematological, renal, endocrine, pulmonary, gastrointestinal, cardiovascular, hepatic, psychiatric, neurologic, or allergic disease.