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When considering cancer in men, prostate cancer could be described as ‘all too frequent’. Indeed, the annual month of ‘Movember’ is here once again and serves as a stark reminder that men worldwide are still dying too young from this disease. Worldwide prostate cancer is currently the second most common cancer in males and the fourth most common cancer overall, with over 1.1 million new cases diagnosed in 2012. Prostate cancer diagnoses have been increasing in recent years, partly attributable to more widespread use of screening procedures such as PSA testing [1][2][3].

Perhaps as expected for such a common cancer, drug development for prostate cancer is particularly active. Current Pharmaprojects data shows there are 355 drugs in active development for prostate cancer (Figure 1). Of these 31 are launched drugs, with a further 8 approved or submitted for approval. Phase III accounts for 40 drugs in development. However, despite this large development pool, most development for prostate cancer is still at the early-to-mid stages, with 276 drugs currently in preclinical to Phase II trials.

Figure 1 Drugs in active development for prostate cancer

Top drugs for prostate cancer
A look at the most common biological targets for prostate cancer drugs in active development gives a good picture of the disease landscape (Figure 2), and we’ll highlight a few candidates from various targets here [4]. One of the most prominent prostate cancer therapeutics in recent years is Medivation’s androgen receptor antagonist enzalutamide, which is licensed to Astellas. First launched in the US in 2012, enzalutamide has since been launched in the EU, Canada and Japan, with registrations pending in Australia, Brazil, South Africa and Switzerland.

Another late stage drug is Teikoku Pharma’s alcohol-free formulation of docetaxel. The drug is currently awaiting approval in the US for prostate cancer, as well as head and neck, lung and breast cancers.

Currently in Phase III trials is FP-001, a depot formulation of the gonadotropin releasing hormone (GnRH) agonist leuprorelin, which is part of a joint venture agreement between ScinoPharm and US-based Forsee Pharmaceuticals. Worldwide filings are planned, with US launch expected in 2016/17.

A promising clinical candidate for prostate cancer is CureVac’s CV-9103, a gene therapy comprising a modified single-stranded mRNA coding 4 antigens expressed by prostate cancer cells. Following a successful Phase I/II trial in 44 prostate cancer patients in which 70% of patients responded to at least 1 of CV-9103 antigens, it is currently in a Phase IIb study in 197 metastatic castration-resistant prostate cancer patients. CV-9103 is available for partnering worldwide.

Lastly, Array Biopharma has an early stage candidate in their orally-active EGFR/ErbB2 inhibitor, varlitinib. Currently licensed to Aslan Pharmaceuticals for development worldwide, varlitinib is in Phase I trials for prostate cancer and other solid tumours.

Figure 2 Most common biological targets for prostate cancer drugs in active development

Origins of prostate cancer drugs
Looking at the active landscape for pipeline prostate cancer drugs, chemical entities make up 65%, with biologicals and natural products accounting for the remaining 32% and 3%, respectively (Figure 3). With biologicals taking an ever increasing hold over drug development as a whole, prostate cancer appears to be an area where chemical-based drugs still dominate the landscape. It will therefore be interesting to see if the coming years bring a shift towards biologicals, or whether chemical entities continue to be the mainstay for new prostate cancer therapies.

 Figure 3 Drugs in active development for prostate cancer by origin

Overall, the landscape for prostate cancer looks encouraging. Established launched drugs look set to be backed up by new, up and coming therapies. The preclinical and early clinical phases also reflect the interest in this area from drug development companies. With people flocking to the ‘Movember’ banner every year, this mix of awareness, public support and new drug development can only be a positive move towards conquering this disease.

[1] http://www.cancerresearchuk.org/health-professional/cancer-statistics/statistics-by-cancer-type/prostate-cancer/incidence#heading-Five

[2] http://www.cancerresearchuk.org/health-professional/cancer-statistics/statistics-by-cancer-type/prostate-cancer/incidence#heading-One

[3] https://uk.movember.com/

[4] Details for drugs discussed in this section retrieved from Pharmaprojects® (November 2015).

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