Osteoporosis (T-score of less than -. by DEXA scan) Subjects with history of osteoporosis Women with severe bone density issues/osteoporosis (defined as any medical treatment for osteoporosis, and/or a T-score of -. or lower, and/or history of fracture of the hip or spine) Pts w/ osteopenia (T-score of - to -. at L/R total hip, L/R femoral neck or lumbar spine [L-L]) eligible Bisphosphonate therapy (osteoporosis or symptomatic hypercalcaemia) or denosumab (osteoporosis) prior to study drug Osteoporosis (T-score of