Osteoporosis is a disease characterized by low bone mass and structural deterioration of bone tissue, which leads to greater fragility and an increase in fracture risk.

All bones become more fragile and susceptible to fracture as the disease progresses. People tend to be unaware that their bones are getting weaker, and a person with osteoporosis can fracture a bone from even a minor fall. The debilitating effects of osteoporosis have substantial costs. Loss of mobility, admission to nursing homes and dependence on caregivers are all common consequences of osteoporosis. The prevalence of osteoporosis is growing and, according to the National Osteoporosis Foundation, or NOF, is significantly under-recognized and under-treated in the population.

The NOF has estimated that 10 million people in the United States, composed of eight million women and two million men, already have osteoporosis, and another approximately 44 million have low bone mass placing them at increased risk for osteoporosis. In addition, the NOF has estimated that osteoporosis is responsible for more than two million fractures in the United States each year resulting in an estimated $19 billion in costs annually. The NOF expects that the number of fractures in the United States due to osteoporosis will rise to three million by 2025, resulting in an estimated $25.3 billion in costs each year. Worldwide, osteoporosis affects an estimated 200 million women according to the International Osteoporosis Foundation, or IOF, and causes more than 8.9 million fractures annually, which is equivalent to an osteoporotic fracture occurring approximately every three seconds. The IOF has estimated that 1.6 million hip fractures occur worldwide each year, and by 2050 this number could reach between 4.5 million and 6.3 million. The IOF estimates that in Europe alone, the annual cost of osteoporotic fractures could surpass €76 billion by 2050.

According to the World Health Organization, breast cancer is the second most common cancer in the world and the most prevalent cancer in women, accounting for 16% of all female cancers.

The major cause of death from breast cancer is metastases, most commonly to the bone, liver, lung and brain. Approximately 30% of early-stage patients develop metastatic disease, and of those patients 90% relapse between therapy levels. About 5% of patients have distant metastases at the time of diagnosis, and these patients have a five-year survival rate of only 25%, compared with a greater than 99% survival rate for patients with only local disease. Importantly, even patients without metastases at diagnosis are at risk for developing metastases over time.

Approximately 70% of breast cancers express the estrogen receptor, or ER, and depend on estrogen signaling for growth and survival. Patients with ER-positive breast cancers are typically treated with endocrine therapies. There are three main classes of therapies for ER-positive tumors available: aromatase inhibitors, or AIs; selective estrogen receptor modulators, or SERMs; and selective estrogen receptor degraders, or SERDs.

Radius believes that there is a significant need for new therapeutic options to treat breast cancer.

Vasomotor symptoms, such as hot flashes, hot flushes and night sweats, are common during menopause, with up to 85% of women experiencing them during the menopause transition, for a median duration of four years.

An estimated two million women go through menopause every year in the United States, with a total population of 45 million postmenopausal women. These symptoms can disrupt sleep and interfere with quality of life.

Radius believes that there is a significant need for new therapeutic options to treat vasomotor systems.