The investigator-led PLUTO trial found docetaxel chemotherapy provided a better overall survival benefit than lutetium in first-line mCRPC. This result directly confronts the common clinical bias against chemotherapy ("chemophobia"), proving that older treatments can still outperform newer targeted agents and should not be prematurely abandoned.

A key hypothesis for why docetaxel showed better overall survival than lutetium in the PLUTO trial is that patients treated with lutetium upfront may become unfit for subsequent chemotherapy. This highlights a critical factor in trial design: the planned therapeutic sequence and a patient's ability to receive later-line treatments significantly impact survival outcomes.

Experts admit to preferring docetaxel chemotherapy over lutetium for symptomatic mCRPC patients primarily because it 'feels' more aggressive and is logistically faster to administer. This decision is based on perception and convenience rather than strong clinical evidence comparing the agents in this specific context.

Despite his study showing an overall survival signal favoring docetaxel, lead author Dr. Kim Chi attributes this to crossover bias where patients avoided chemotherapy. He personally favors lutetium first due to its superior tolerability, contradicting the panel's majority opinion.

If lutetium-PSMA is approved and used upfront in hormone-sensitive disease, clinicians may become more comfortable with radioligands generally. This could lead them to use the enzalutamide-radium combination more frequently later on, paradoxically increasing radium's use by flipping the current treatment sequence.

The PR21 trial showed better overall survival for docetaxel followed by Lutetium, despite similar progression-free survival. The likely reason is not drug superiority but patient behavior: a higher percentage of patients complete the second therapy when starting with chemo, highlighting how treatment fatigue significantly impacts survival.

Clinicians may be biased towards lutetium-PSMA because it causes significant PSA drops, which radium-223 does not. This observable metric may not reflect superior overall efficacy, as radium's survival benefit is proven and it may even have unique synergistic potential with drugs like enzalutamide through different biological pathways.

The innovative Triple Switch trial treats all patients with a doublet therapy and then uses their PSA response at six months to guide further treatment. Patients whose PSA fails to reach a nadir are then randomized to receive docetaxel chemotherapy, testing a strategy of early intensification based on a real-time biological response rather than upfront risk stratification.

While Lutetium shows promise in hormone-sensitive prostate cancer, experts raise concerns about potential late-effect toxicities for patients surviving many years. This contrasts with docetaxel, where toxicity is acute and resolves after treatment, highlighting an unknown long-term risk-benefit profile for new radioligand therapies.