Stereotactic Body Radiotherapy for the Treatment of Solitary Bone Plasmacytoma

Plasmacytoma Clinical Trial

Official title: Phase I/II Trial of Stereotactic Body Radiotherapy for the Treatment of Solitary Bone Plasmacytoma

Status Terminated

Clinical Trial Summary

This project aims to propose a new approach in the treatment of solitary plasmacytoma:

hypofractionated irradiation alone with stereotactic technique that may contribute to the successful treatment of this disease.

This work aims to apply this new technique with the primary objective of reducing the progression-free survival for multiple myeloma of patients treated for solitary plasmacytoma, as well as quantify overall survival, local control, toxicities and quality of life in a phase I trial / II.

Clinical Trial Description

Solitary plasmacytoma is a rare disease whose treatment has not evolved much in the last decades. The role of radiotherapy in the curative treatment of this entity was defined in a major publication in the 1980s and has since been proven to be the best practice in several other comparative trials, mostly retrospective. The radiotherapy dose of curative intent has also been described over the same period and remains unchanged to this day. Thus, local control, disease cure rate, and rate and progression time for multiple myeloma have been unaffected for almost 30 years.

Radiobiology of plasmacytoma cells is also not widely studied. The alpha / beta ratio, which defines the pattern of response of this disease to radiotherapy fractions and its response time, is also not well described. However, it is believed to be smaller in comparison to other hematological malignancies due to reports of cases of intrinsic radioresistance and late recurrence and reports of success with hypofractionated dose in isolated cases where stereotactic techniques were used such as base of skull and spine. ;

Related Conditions & MeSH terms

• Plasmacytoma

• NCT number: NCT03312868
• Study type: Interventional
• Source: Instituto do Cancer do Estado de São Paulo
• Status: Terminated
• Phase: Phase 2
• Start date: October 1, 2017
• Completion date: March 28, 2022