Cited by 78Prostate Cancer Treatment and ResearchProstate Cancer Diagnosis and TreatmentMonoclonal and Polyclonal Antibodies Research

Phase 1/2 multiple ascending dose trial of the prostate-specific membrane antigen-targeted antibody drug conjugate MLN2704 in metastatic castration-resistant prostate cancer

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Milowsky, Matthew I., Galsky, Matthew D., Morris, Michael J., Crona, Daniel J., George, Daniel J., Dreicer, Robert, Tse, Kin, Petruck, Jesika +4 more·2016·Urologic Oncology: Seminars and Original Investigations

Abstract

Background This phase 1/2 study evaluated the dose-limiting toxicity and maximum tolerated dose of MLN2704, a humanized monoclonal antibody MLN591 targeting prostate-specific membrane antigen, linked to the maytansinoid DM1 in patients with progressive metastatic castration-resistant prostate cancer.Patients and methods A total of 62 patients received MLN2704 at ascending doses on 4 schedules: weekly (60, 84, 118, and 165mg/m 2; 12 patients); every 2 weeks (120, 168, 236, and 330mg/m 2; 15 patients); every 3 weeks (330 and 426mg/m 2; 18 patients); and on days 1 and 15 of a 6-week schedule (6-week cycle, 330mg/m 2; 17 patients). The primary efficacy endpoint was a sustained ≥50% decline from baseline prostate-specific antigen (PSA) without evidence of disease progression. Toxicity, pharmacokinetics, immunogenicity, and antitumor activity were assessed.Results Neurotoxicity was dose-limiting. Overall, 44 patients (71%) exhibited peripheral neuropathy: 6 (10%) had grade 3/4. Neurotoxicity rates remained high despite increasing the dosing interval to 3 (13 of 14; one grade 3) and 6 weeks (16 of 17; three grade 3). MLN2704 pharmacokinetics were dose-linear. Rapid deconjugation of DM1 from the conjugated antibody was seen. In all, 5 patients (8%) experienced ≥50% decline in PSA; 5 (8%) had PSA stabilization lasting≥90 days. Only 2 of 35 patients on the 3- and 6-week schedules achieved a PSA decline of >50%.Conclusions MLN2704 has limited activity in metastatic castration-resistant prostate cancer. Disulfide linker lability and rapid deconjugation lead to neurotoxicity and a narrow therapeutic window.

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Crossref · 10.1016/j.urolonc.2016.07.005

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  • Disulfide linker lability and rapid deconjugation in MLN2704 led to significant neurotoxicity, with 44 (71%) patients experiencing dose-limiting peripheral neuropathy halting clinical development.

    “Moreover, this trial found that disulfide linker lability and rapid deconjugation in MLN2704 led to significant neurotoxicity, with 44 (71%) patients experiencing dose-limiting peripheral neuropathy halting clinical development71.”

    From The evolving landscape of antibody-drug conjugates (ADCs) for treatment of prostate cancer (2025) · cites this paper as [71]

    The Abstract Results and Results > Adverse Events report peripheral neuropathy in 44 patients (71%), but only six (10%) had grade 3/4 neuropathy. The Abstract Conclusion links disulfide linker lability and rapid deconjugation to neurotoxicity, and the Discussion says the unfavorable safety profile precluded further study. The source calls neurotoxicity dose-limiting; it does not say that all 44 patients experienced dose-limiting neuropathy. (LLM, conf=0.89)

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  • In a phase I/II trial, only 5 out of 62 patients with mCRPC (8%) had a decrease in PSA and PSA stabilization lasting ≥90 days following treatment, suggesting limited efficacy of MLN2704.

    “This was then followed by a phase I/II trial in which only 5 out of 62 patients with mCRPC (8%) had a decrease in PSA and PSA stabilization lasting ≥90 days following treatment, suggesting limited efficacy of MLN270471.”

    From The evolving landscape of antibody-drug conjugates (ADCs) for treatment of prostate cancer (2025) · cites this paper as [71]

    The Results (Patient Characteristics; Antitumor Effects) report 62 patients, five (8%) with a ≥50% PSA decline, and five (8%) with PSA stabilization lasting ≥90 days. The Discussion describes overall efficacy as limited. The paper reports the decline and stabilization as separate outcomes; it does not establish that the same five patients had both. (LLM, conf=0.86)

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Authors
Milowsky, M. I., Galsky, M. D., Morris, M. J., Crona, D. J., George, D. J., Dreicer, R., Tse, K., Petruck, J., Webb, I. J., Bander, N. H., Nanus, D. M., & Scher, H. I.
Affiliations
  • Memorial Sloan Kettering Cancer Center (US)
  • University of North Carolina at Chapel Hill (US)
  • Duke Medical Center (US)
  • Cleveland Clinic (US)
  • Takeda Oncology (United States) (US)
  • Weill Cornell Medicine (US)
Corresponding author
Scher, Howard I.
Venue
Urologic Oncology: Seminars and Original Investigations
Publisher
Elsevier BV
Published
2016-12
Volume
34
Issue
12
Pages
530.e15-530.e21
ISSN
1078-1439 (ISSN-L)
OpenAlex
W2539038764
Cited by
78
References
12
Citations by year
2026: 7 · 2025: 16 · 2024: 11 · 2023: 10 · 2022: 7 · 2021: 13 · 2020: 4 · 2019: 3 · 2018: 5 · 2017: 2
FWCI
2.98
Type
journal article
Language
en
Open access
Locations
  • Urologic Oncology Seminars and Original Investigations (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Cancer Institute (P30CA008748, P30CA016086)
Topics
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Prostate Cancer Treatment and Research
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Prostate Cancer Diagnosis and Treatment
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Monoclonal and Polyclonal Antibodies Research
Keywords
antibody-drug conjugates, prostate-specific membrane antigen, metastatic castration-resistant prostate cancer, maytansinoid DM1, dose-limiting toxicity, peripheral neuropathy, neurotoxicity, pharmacokinetics, deconjugation, dosing regimen, PSA response, immunogenicity
MeSH terms
Antineoplastic Agents, Immunological, Adenocarcinoma, Aged, Aged, 80 and over, Antibodies, Monoclonal, Dose-Response Relationship, Immunologic, Gastrointestinal Diseases, Humans, Male, Maytansine, Middle Aged, Peripheral Nervous System Diseases, Drug Monitoring, Prostate-Specific Antigen, Disease-Free Survival, Immunoconjugates, Maximum Tolerated Dose, Prostatic Neoplasms, Castration-Resistant

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