31P MRS as an early prognostic indicator of patient response to chemotherapy

✍ Scribed by O. M. Redmond; J. P. Stack; N. G. O'Connor; D. N. Carney; P. A. Dervan; B. J. Hurson; J. T. Ennis

• Publisher: John Wiley and Sons
• Year: 1992
• Tongue: English
• Weight: 765 KB
• Volume: 25
• Category: Article
• ISSN: 0740-3194
• DOI: 10.1002/mrm.1910250104

✦ Synopsis

Abstract

In this study ^31^P spectral changes were closely monitored following the initial administration of cytotoxic drugs and related to five parameters of patient response. Pre‐ and postchemotherapy ^31^P MRS examinations were performed on 16 patients with large, malignant tumors. These included four tumor types: (i) lymphoma (n = 7),(ii) breast carcinoma (n = 4), (iii) musculoskeletal tumors (n = 4), and (iv) adenocarcinoma (n = 1). A mean of 5 spectra/patient (range 2–10) was performed following the initial chemotherapy. The spectral trends exhibited by 14 of 16 patients reached “points of maximum change,” after which they began to revert toward prechemotherapy values. In 2 of 16 patients that did not respond to the initial chemotherapy regimen, no spectral trends were observed. The degree of change of certain spectral parameters, namely, decreases in PME, PME/ PDE, PME/PCr, PME/NTP, PDE/PCr, and tumor pH, as well as increases in the ratios P~i~/PME and P~i~/PDE, were associated with good patient response and separated responders from nonresponders. Pi/PME appears the most promising for discriminating partial from Complete responders.