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Hohberg M, Reifegerst M, Drzezga A, Wild M, Schmidt M. Prediction of Response to ¹⁷⁷Lu-PSMA Therapy Based on Tumor-to-Kidney Ratio on Pretherapeutic PSMA PET/CT and Posttherapeutic Tumor-Dose Evaluation in mCRPC. J Nucl Med 2023;64:1758-1764. [PMID: 37652546 DOI: 10.2967/jnumed.122.264953] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 07/25/2023] [Indexed: 09/02/2023] Open

Abstract

The aim of this study was to analyze the absorbed dose of 177Lu-PSMA in osseous versus lymphatic metastases in patients with metastatic castration-resistant prostate cancer across therapy cycles and to relate those data to therapeutic success. In addition, pretherapeutic prostate-specific membrane antigen (PSMA) PET/CT was evaluated for its ability to predict response behavior. Methods: The study comprised 30 patients with metastatic castration-resistant prostate cancer, each receiving at least 3 cycles of 177Lu-PSMA therapy. Prostate-specific antigen (PSA) values between baseline and 6 wk after the third therapy cycle were used to classify the patients as responders (PSA decline ≥ 50%) or nonresponders (unchanged or increasing PSA level). Quantitative SPECT/CT images were acquired 24, 48, and 168 h after application of 177Lu-PSMA. The absorbed dose for tumor lesions was calculated with dosimetry software. From the pretherapeutic PET/CT scan, the tumor-to-kidney uptake ratio was determined for different SUVs. Results: Regardless of patient response, the kidneys received a mean dose of 0.55 ± 0.20 Gy/GBq per cycle. In the first therapy cycle, the lymph node lesions received a mean dose of 3.73 ± 1.65 Gy/GBq in responders and 1.86 ± 1.25 Gy/GBq in nonresponders (P < 0.01). For bone lesions, the respective mean doses were 3.47 ± 2.00 Gy/GBq and 1.48 ± 0.95 Gy/GBq (P < 0.01). When successive therapy cycles were compared, the mean dose was found to have been reduced from the first to the second cycle by 27% for lymph nodes and by 33% for bone lesions. A significant difference (P < 0.01) in the ratio of lymph node and bone lesion uptake to kidney uptake between responders and nonresponders could be deduced from the pretherapeutic PET/CT scan. Conclusion: Significantly higher doses were achieved for lymph node and bone lesions in responders. The highest absorbed dose, for both lymphatic and osseous lesions, was achieved in the first cycle, decreasing in the second therapy cycle thereafter despite unchanged therapy activities. It may be possible to estimate the response to therapy from the ratio of tumor uptake to kidney uptake obtained from the pretherapeutic PSMA PET/CT scans.

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Lawhn-Heath C, Salavati A, Behr SC, Rowe SP, Calais J, Fendler WP, Eiber M, Emmett L, Hofman MS, Hope TA. Prostate-specific Membrane Antigen PET in Prostate Cancer. Radiology 2021;299:248-260. [PMID: 33787338 DOI: 10.1148/radiol.2021202771] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]

Affiliation(s)

Courtney Lawhn-Heath From the Department of Radiology and Biomedical Imaging (C.L.H., S.C.B., T.A.H.) and Helen Diller Family Comprehensive Cancer Center (S.C.B., T.A.H.), University of California San Francisco, 505 Parnassus Ave, M391, San Francisco, CA 94143; Department of Radiology and Radiological Science, Johns Hopkins University, Baltimore, Md (A.S., S.P.R.); Ahmanson Translational Theranostics Division, Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, Calif (J.C.); Department of Nuclear Medicine, University of Duisburg-Essen and German Cancer Consortium (DKTK)-University Hospital Essen, Essen, Germany (W.P.F.); Department of Nuclear Medicine, Technical University of Munich, Munich, Germany (M.E.); Department of Theranostics and Nuclear Medicine, St. Vincent's Hospital, Sydney, Australia (L.E.); Prostate Theranostics and Imaging Centre of Excellence (ProsTIC), Peter MacCallum Cancer Centre, Melbourne, Australia (M.S.H.); and Sir Peter MacCallum Department of Oncology, University of Melbourne, Melbourne, Australia (M.S.H.)
Ali Salavati From the Department of Radiology and Biomedical Imaging (C.L.H., S.C.B., T.A.H.) and Helen Diller Family Comprehensive Cancer Center (S.C.B., T.A.H.), University of California San Francisco, 505 Parnassus Ave, M391, San Francisco, CA 94143; Department of Radiology and Radiological Science, Johns Hopkins University, Baltimore, Md (A.S., S.P.R.); Ahmanson Translational Theranostics Division, Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, Calif (J.C.); Department of Nuclear Medicine, University of Duisburg-Essen and German Cancer Consortium (DKTK)-University Hospital Essen, Essen, Germany (W.P.F.); Department of Nuclear Medicine, Technical University of Munich, Munich, Germany (M.E.); Department of Theranostics and Nuclear Medicine, St. Vincent's Hospital, Sydney, Australia (L.E.); Prostate Theranostics and Imaging Centre of Excellence (ProsTIC), Peter MacCallum Cancer Centre, Melbourne, Australia (M.S.H.); and Sir Peter MacCallum Department of Oncology, University of Melbourne, Melbourne, Australia (M.S.H.)
Spencer C Behr From the Department of Radiology and Biomedical Imaging (C.L.H., S.C.B., T.A.H.) and Helen Diller Family Comprehensive Cancer Center (S.C.B., T.A.H.), University of California San Francisco, 505 Parnassus Ave, M391, San Francisco, CA 94143; Department of Radiology and Radiological Science, Johns Hopkins University, Baltimore, Md (A.S., S.P.R.); Ahmanson Translational Theranostics Division, Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, Calif (J.C.); Department of Nuclear Medicine, University of Duisburg-Essen and German Cancer Consortium (DKTK)-University Hospital Essen, Essen, Germany (W.P.F.); Department of Nuclear Medicine, Technical University of Munich, Munich, Germany (M.E.); Department of Theranostics and Nuclear Medicine, St. Vincent's Hospital, Sydney, Australia (L.E.); Prostate Theranostics and Imaging Centre of Excellence (ProsTIC), Peter MacCallum Cancer Centre, Melbourne, Australia (M.S.H.); and Sir Peter MacCallum Department of Oncology, University of Melbourne, Melbourne, Australia (M.S.H.)
Steven P Rowe From the Department of Radiology and Biomedical Imaging (C.L.H., S.C.B., T.A.H.) and Helen Diller Family Comprehensive Cancer Center (S.C.B., T.A.H.), University of California San Francisco, 505 Parnassus Ave, M391, San Francisco, CA 94143; Department of Radiology and Radiological Science, Johns Hopkins University, Baltimore, Md (A.S., S.P.R.); Ahmanson Translational Theranostics Division, Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, Calif (J.C.); Department of Nuclear Medicine, University of Duisburg-Essen and German Cancer Consortium (DKTK)-University Hospital Essen, Essen, Germany (W.P.F.); Department of Nuclear Medicine, Technical University of Munich, Munich, Germany (M.E.); Department of Theranostics and Nuclear Medicine, St. Vincent's Hospital, Sydney, Australia (L.E.); Prostate Theranostics and Imaging Centre of Excellence (ProsTIC), Peter MacCallum Cancer Centre, Melbourne, Australia (M.S.H.); and Sir Peter MacCallum Department of Oncology, University of Melbourne, Melbourne, Australia (M.S.H.)
Jeremie Calais From the Department of Radiology and Biomedical Imaging (C.L.H., S.C.B., T.A.H.) and Helen Diller Family Comprehensive Cancer Center (S.C.B., T.A.H.), University of California San Francisco, 505 Parnassus Ave, M391, San Francisco, CA 94143; Department of Radiology and Radiological Science, Johns Hopkins University, Baltimore, Md (A.S., S.P.R.); Ahmanson Translational Theranostics Division, Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, Calif (J.C.); Department of Nuclear Medicine, University of Duisburg-Essen and German Cancer Consortium (DKTK)-University Hospital Essen, Essen, Germany (W.P.F.); Department of Nuclear Medicine, Technical University of Munich, Munich, Germany (M.E.); Department of Theranostics and Nuclear Medicine, St. Vincent's Hospital, Sydney, Australia (L.E.); Prostate Theranostics and Imaging Centre of Excellence (ProsTIC), Peter MacCallum Cancer Centre, Melbourne, Australia (M.S.H.); and Sir Peter MacCallum Department of Oncology, University of Melbourne, Melbourne, Australia (M.S.H.)
Wolfgang P Fendler From the Department of Radiology and Biomedical Imaging (C.L.H., S.C.B., T.A.H.) and Helen Diller Family Comprehensive Cancer Center (S.C.B., T.A.H.), University of California San Francisco, 505 Parnassus Ave, M391, San Francisco, CA 94143; Department of Radiology and Radiological Science, Johns Hopkins University, Baltimore, Md (A.S., S.P.R.); Ahmanson Translational Theranostics Division, Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, Calif (J.C.); Department of Nuclear Medicine, University of Duisburg-Essen and German Cancer Consortium (DKTK)-University Hospital Essen, Essen, Germany (W.P.F.); Department of Nuclear Medicine, Technical University of Munich, Munich, Germany (M.E.); Department of Theranostics and Nuclear Medicine, St. Vincent's Hospital, Sydney, Australia (L.E.); Prostate Theranostics and Imaging Centre of Excellence (ProsTIC), Peter MacCallum Cancer Centre, Melbourne, Australia (M.S.H.); and Sir Peter MacCallum Department of Oncology, University of Melbourne, Melbourne, Australia (M.S.H.)
Mattias Eiber From the Department of Radiology and Biomedical Imaging (C.L.H., S.C.B., T.A.H.) and Helen Diller Family Comprehensive Cancer Center (S.C.B., T.A.H.), University of California San Francisco, 505 Parnassus Ave, M391, San Francisco, CA 94143; Department of Radiology and Radiological Science, Johns Hopkins University, Baltimore, Md (A.S., S.P.R.); Ahmanson Translational Theranostics Division, Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, Calif (J.C.); Department of Nuclear Medicine, University of Duisburg-Essen and German Cancer Consortium (DKTK)-University Hospital Essen, Essen, Germany (W.P.F.); Department of Nuclear Medicine, Technical University of Munich, Munich, Germany (M.E.); Department of Theranostics and Nuclear Medicine, St. Vincent's Hospital, Sydney, Australia (L.E.); Prostate Theranostics and Imaging Centre of Excellence (ProsTIC), Peter MacCallum Cancer Centre, Melbourne, Australia (M.S.H.); and Sir Peter MacCallum Department of Oncology, University of Melbourne, Melbourne, Australia (M.S.H.)
Louise Emmett From the Department of Radiology and Biomedical Imaging (C.L.H., S.C.B., T.A.H.) and Helen Diller Family Comprehensive Cancer Center (S.C.B., T.A.H.), University of California San Francisco, 505 Parnassus Ave, M391, San Francisco, CA 94143; Department of Radiology and Radiological Science, Johns Hopkins University, Baltimore, Md (A.S., S.P.R.); Ahmanson Translational Theranostics Division, Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, Calif (J.C.); Department of Nuclear Medicine, University of Duisburg-Essen and German Cancer Consortium (DKTK)-University Hospital Essen, Essen, Germany (W.P.F.); Department of Nuclear Medicine, Technical University of Munich, Munich, Germany (M.E.); Department of Theranostics and Nuclear Medicine, St. Vincent's Hospital, Sydney, Australia (L.E.); Prostate Theranostics and Imaging Centre of Excellence (ProsTIC), Peter MacCallum Cancer Centre, Melbourne, Australia (M.S.H.); and Sir Peter MacCallum Department of Oncology, University of Melbourne, Melbourne, Australia (M.S.H.)
Michael S Hofman From the Department of Radiology and Biomedical Imaging (C.L.H., S.C.B., T.A.H.) and Helen Diller Family Comprehensive Cancer Center (S.C.B., T.A.H.), University of California San Francisco, 505 Parnassus Ave, M391, San Francisco, CA 94143; Department of Radiology and Radiological Science, Johns Hopkins University, Baltimore, Md (A.S., S.P.R.); Ahmanson Translational Theranostics Division, Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, Calif (J.C.); Department of Nuclear Medicine, University of Duisburg-Essen and German Cancer Consortium (DKTK)-University Hospital Essen, Essen, Germany (W.P.F.); Department of Nuclear Medicine, Technical University of Munich, Munich, Germany (M.E.); Department of Theranostics and Nuclear Medicine, St. Vincent's Hospital, Sydney, Australia (L.E.); Prostate Theranostics and Imaging Centre of Excellence (ProsTIC), Peter MacCallum Cancer Centre, Melbourne, Australia (M.S.H.); and Sir Peter MacCallum Department of Oncology, University of Melbourne, Melbourne, Australia (M.S.H.)
Thomas A Hope From the Department of Radiology and Biomedical Imaging (C.L.H., S.C.B., T.A.H.) and Helen Diller Family Comprehensive Cancer Center (S.C.B., T.A.H.), University of California San Francisco, 505 Parnassus Ave, M391, San Francisco, CA 94143; Department of Radiology and Radiological Science, Johns Hopkins University, Baltimore, Md (A.S., S.P.R.); Ahmanson Translational Theranostics Division, Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, Calif (J.C.); Department of Nuclear Medicine, University of Duisburg-Essen and German Cancer Consortium (DKTK)-University Hospital Essen, Essen, Germany (W.P.F.); Department of Nuclear Medicine, Technical University of Munich, Munich, Germany (M.E.); Department of Theranostics and Nuclear Medicine, St. Vincent's Hospital, Sydney, Australia (L.E.); Prostate Theranostics and Imaging Centre of Excellence (ProsTIC), Peter MacCallum Cancer Centre, Melbourne, Australia (M.S.H.); and Sir Peter MacCallum Department of Oncology, University of Melbourne, Melbourne, Australia (M.S.H.)

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Zacherl MJ, Gildehaus FJ, Mittlmeier L, Böning G, Gosewisch A, Wenter V, Unterrainer M, Schmidt-Hegemann N, Belka C, Kretschmer A, Casuscelli J, Stief CG, Unterrainer M, Bartenstein P, Todica A, Ilhan H. First Clinical Results for PSMA-Targeted α-Therapy Using ²²⁵Ac-PSMA-I&T in Advanced-mCRPC Patients. J Nucl Med 2020;62:669-674. [PMID: 33008928 DOI: 10.2967/jnumed.120.251017] [Citation(s) in RCA: 81] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Accepted: 08/27/2020] [Indexed: 12/12/2022] Open

Abstract

Treatment of advanced metastatic castration-resistant prostate cancer after failure of approved therapy options remains challenging. Prostate-specific membrane antigen (PSMA)-targeting β- and α-emitters have been introduced, with promising response rates. Here, we present the first-to our knowledge-clinical data for PSMA-targeted α-therapy (TAT) using ²²⁵Ac-PSMA imaging and therapy (I&T). Methods: Fourteen patients receiving ²²⁵Ac-PSMA-I&T were included in this retrospective analysis. Eleven of the 14 had prior second-line antiandrogen treatment with abiraterone or enzalutamide, prior chemotherapy, and prior ¹⁷⁷Lu-PSMA treatment. Patients were treated at bimonthly intervals until progression or intolerable side effects. Prostate-specific antigen (PSA) was measured for response assessment. Hematologic and nonhematologic side effects were recorded according to the Common Terminology Criteria for Adverse Events, version 5.0. Results: Thirty-four cycles of ²²⁵Ac-PSMA-I&T were applied (median dose, 7.8 MBq; range, 6.0-8.5), with 1 cycle in 3 patients, 2 cycles in 7 patients, 4 cycles in 3 patients, and 5 cycles in 1 patient. No acute toxicity was observed during hospitalization. Baseline PSA was 112 ng/mL (range, 20.5-818 ng/mL). The best PSA response after TAT (a PSA decline ≥ 50%) was observed in 7 patients, and a PSA decline of any amount was observed in 11 patients. Three patients had no PSA decline at any time. A subgroup analysis of 11 patients with prior ¹⁷⁷Lu-PSMA treatment showed any PSA decline in 8 patients and a decline of at least 50% in 5 patients. After TAT, grade 3 anemia was observed in 3 of the 14 patients, with 2 of them presenting with grade 2 anemia already at baseline. Grade 3 leukopenia was observed in 1 patient. Eight patients with preexisting xerostomia after ¹⁷⁷Lu-PSMA showed no worsening after TAT. Newly diagnosed grade 1 or 2 xerostomia after TAT was observed in 5 patients. One patient reported no xerostomia at all. Conclusion: Our first clinical data for TAT using ²²⁵Ac-PSMA-I&T showed a promising antitumor effect in advanced metastatic castration-resistant prostate cancer. These results are highly comparable to data on ²²⁵Ac-PSMA-617 TAT.

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