| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated  | 
| High- or very-high risk, localized or locally advanced prostate cancer | 
 
 
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| E.1.1.1 | Medical condition in easily understood language  | 
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| E.1.1.2 | Therapeutic area  | Diseases [C] - Cancer [C04] | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| E.1.2 | Version  | 20.0 | 
 
| E.1.2 | Level  | PT | 
 
| E.1.2 | Classification code  | 10060862 | 
 
| E.1.2 | Term  | Prostate cancer | 
 
| E.1.2 | System Organ Class  | 10029104 - Neoplasms benign, malignant and unspecified (incl cysts and polyps) | 
 
 
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| E.1.3 | Condition being studied is a rare disease  |  No  | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial  | 
| To determine if apalutamide plus gonadotropin releasing hormone (GnRH) agonist in subjects with high-risk, localized or locally advanced prostate cancer receiving primary radiation therapy (RT) results in an improvement of metastasis-free survival (MFS) evaluated by blinded independent central review (BICR) | 
 
 
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| E.2.2 | Secondary objectives of the trial  | 
- To characterize the safety profile of apalutamide plus GnRH agonist in subjects with high-risk, localized or locally advanced prostate cancer receiving primary RT - To determine if apalutamide plus GnRH agonist in subjects with high-risk, localized or locally advanced prostate cancer receiving primary RT results in an improvement of: * Event-free survival * Time to PSA progression * Overall survival (OS) * Time to distant metastasis * Time to next local or systemic treatment * MFS by conventional or positron emission tomography (PET) imaging | 
 
 
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| E.2.3 | Trial contains a sub-study  |  No  | 
| E.3 | Principal inclusion criteria  | 
- Age >= 18 years - Indicated and planned to receive primary radiation therapy for prostate cancer - Histologically confirmed adenocarcinoma of an intact prostate, and 1 of the following at diagnosis:  1) Gleason score >=8 and >=cT2c stage per AJCC 8th Edition,  2) Gleason score 7, PSA >=20 nanogram per mililiters (ng/mL), and >=cT2c stage per AJCC 8th Edition - Charlson comorbidity index (CCI) <=3 - An Eastern Cooperative Oncology Group (ECOG) Performance Status (PS) grade of 0 or 1 - Adequate organ function determined by the following central laboratory values:  1) aspartate aminotransferase (AST), alanine aminotransferase (ALT) within normal limits (WLN) 2) total bilirubin WNL 3) Serum creatinine <1.5 mg/dL (<133 μmol/L) 4) Platelets ≥140,000/μL, independent of transfusion and/or growth factors within 3 months prior to randomization 5) Hemoglobin ≥ 12.0 g/dL (7.4 mmol), independent of transfusion and/or growth factors within 3 months prior to randomization - Participants who are sexually active (even men with vasectomies) and willing to use a condom and agree not to donate sperm during the trial - Signed, written, informed consent - Be able to swallow whole study drug tablets | 
 
 
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| E.4 | Principal exclusion criteria | 
- Presence of distant metastasis (clinical stage M1). Isolated pelvic nodal disease below the iliac bifurcation (clinical stage N1) is not an exclusion. Diagnosis of distant metastasis (clinical M stage; M0 versus M1a, M1b, M1c) and pelvic nodal disease (clinical N stage; N1 versus N0) will be assessed by central radiological review. Patients are considered eligible only if the central radiological review confirms clinical stage M0. - Prior treatment with GnRH analogue or antiandrogen or both for >3 months prior to randomization - Bilateral orchiectomy - History of pelvic radiation - Prior systemic (eg, chemotherapy) or local (eg, radical prostatectomy, cryotherapy) treatment for prostate cancer - History of seizure or any condition that may predispose to seizure (including, but not limited to prior stroke, transient ischemic attack or loss of consciousness <= 1 year prior to randomization; brain arteriovenous malformation; or intracranial masses such as schwannomas and meningiomas that are causing edema or mass effect) - Prior treatment with enzalutamide, abiraterone acetate, orteronel, galeterone, ketoconazole, aminoglutethimide, estrogens, megestrol acetate, and progestational agents (including cyproterone acetate) for prostate cancer - Prior treatment with radiopharmaceutical agents (eg, strontium 89) or immunotherapy (eg, sipuleucel-T) for prostate cancer - Prior treatment with systemic glucocorticoids ≤4 weeks prior to randomization or subject expected to require long-term use of corticosteroids during the study - Use of 5-alpha reductase inhibitors (eg, dutasteride, finasteride) <=4 weeks prior to randomization - Use of any investigational agent <=4 weeks prior to randomization - Current chronic use of opioid analgesics for >=3 weeks for oral or >7 days for non-oral formulations - Major surgery <=4 weeks prior to randomization - Current or prior treatment with antiepileptic medications for the treatment of seizures - Gastrointestinal conditions affecting absorption - Known or suspected contraindications or hypersensitivity to apalutamide, bicalutamide or GnRH agonists or any of the components of the formulations - Any condition for which, in the opinion of the investigator, participation would not be in the best interest of the subject | 
 
 
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| E.5 End points | 
| E.5.1 | Primary end point(s) | 
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| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
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| E.5.2 | Secondary end point(s) | 
- Event-free survival - Time to PSA progression - Overall Survival (OS) | 
 
 
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| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
 | 
| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis |  No  | 
| E.6.2 | Prophylaxis |  No  | 
| E.6.3 | Therapy |  No  | 
| E.6.4 | Safety |  Yes  | 
| E.6.5 | Efficacy |  Yes  | 
| E.6.6 | Pharmacokinetic |  Yes  | 
| E.6.7 | Pharmacodynamic |  No  | 
| E.6.8 | Bioequivalence |  No  | 
| E.6.9 | Dose response |  No  | 
| E.6.10 | Pharmacogenetic |  No  | 
| E.6.11 | Pharmacogenomic |  No  | 
| E.6.12 | Pharmacoeconomic |  No  | 
| E.6.13 | Others |  No  | 
| E.7 | Trial type and phase | 
| E.7.1 | Human pharmacology (Phase I) |  No  | 
| E.7.1.1 | First administration to humans |  No  | 
| E.7.1.2 | Bioequivalence study |  No  | 
| E.7.1.3 | Other |  No  | 
| E.7.1.3.1 | Other trial type description |  | 
| E.7.2 | Therapeutic exploratory (Phase II) |  No  | 
| E.7.3 | Therapeutic confirmatory (Phase III) |  Yes  | 
| E.7.4 | Therapeutic use (Phase IV) |  No  | 
| E.8 Design of the trial | 
| E.8.1 | Controlled |  Yes  | 
| E.8.1.1 | Randomised |  Yes  | 
| E.8.1.2 | Open |  No  | 
| E.8.1.3 | Single blind |  No  | 
| E.8.1.4 | Double blind  |  Yes  | 
| E.8.1.5 | Parallel group |  No  | 
| E.8.1.6 | Cross over  |  No  | 
| E.8.1.7 | Other |  No  | 
| E.8.2 |  Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) |  Yes  | 
| E.8.2.2 | Placebo  |  Yes  | 
| E.8.2.3 | Other |  No  | 
| E.8.2.4 | Number of treatment arms in the trial | 2 | 
| E.8.3 | 
                                The trial involves single site in the Member State concerned
                             |  No  | 
| E.8.4 |  The trial involves multiple sites in the Member State concerned  |  Yes  | 
| E.8.4.1 | Number of sites anticipated in Member State concerned | 8 | 
| E.8.5 | The trial involves multiple Member States |  Yes  | 
| E.8.5.1 | Number of sites anticipated in the EEA | 375 | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.1 | Trial being conducted both within and outside the EEA |  Yes  | 
| E.8.6.2 | Trial being conducted completely outside of the EEA |  No  | 
| E.8.6.3 | If E.8.6.1 or E.8.6.2 are Yes, specify the regions in which trial sites are planned | 
| Argentina | 
 
| Brazil | 
 
| Canada | 
 
| China | 
 
| Israel | 
 
| Korea, Republic of | 
 
| Malaysia | 
 
| Mexico | 
 
| Taiwan | 
 
| United States | 
 
| France | 
 
| Poland | 
 
| Sweden | 
 
| Bulgaria | 
 
| Netherlands | 
 
| Romania | 
 
| Spain | 
 
| Czechia | 
 
| Germany | 
 
| Italy | 
 
| Belgium | 
 
| Russian Federation | 
 
| Turkey | 
 
| Ukraine | 
 
| United Kingdom | 
 
 
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| E.8.7 | Trial has a data monitoring committee |  Yes  | 
| E.8.8 | 
                        Definition of the end of the trial and justification where it is not the last
                        visit of the last subject undergoing the trial
                     | 
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| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years | 9 | 
| E.8.9.1 | In the Member State concerned months | 6 | 
| E.8.9.1 | In the Member State concerned days |  | 
| E.8.9.2 | In all countries concerned by the trial years | 9 | 
| E.8.9.2 | In all countries concerned by the trial months | 6 |