Testing the Addition of Docetaxel (Chemotherapy) to the Usual Treatment (Hormonal Therapy and Apalutamide) for Metastatic Prostate Cancer, ASPIRE Trial

Inclusion Criteria: * Documentation of disease: \* Histologically or cytologically confirmed adenocarcinoma of the prostate without small cell histology * Must have had evidence of metastatic disease (American Joint Committee on Cancer \[AJCC\] metastasis \[M\]1 disease) based on conventional CT/MRI and/or bone scan. This will be defined as: * Bone metastases detected by CT, radionuclide technetium-99 (99Tc)- methylene bisphosphonate bone scan, or MRI as defined by PCWG3 criteria; OR * Non-pelvic lymph node metastases (measurable lymph nodes above the aortic bifurcation; lymph nodes are measurable if the short axis diameter is ≥ 15 mm) detected on CT or MRI as defined by Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1. Subjects with regional lymph node metastases only (nodes \[N\]1, below the aortic bifurcation) will not be eligible for the study; OR * Visceral or soft tissue metastases detected on CT or MRI as defined by RECIST version 1.1. Soft tissue/visceral lesions are measurable if the long axis diameter is ≥ 10 mm * Evidence of metastatic disease by PSMA-PET only and not visible by CT, radionuclide bone scan, or MRI will not satisfy eligibility criteria * No metachronous low-volume disease (defined as recurrent metastatic disease after definitive treatment of prostate primary) and with ≤ 4 bone metastasis and no visceral metastasis on conventional imaging by CT, radionuclide 99Tc-biphosphonate bone scan, or MRI) * Next generation sequenci…