Top Line: It wasn’t so long ago that a radiation oncologist would see “bone met” on her schedule and formulate a general plan without any other clinical details. Not anymore.
The Guidelines: Not only can we now take a simple plan from 10 to 5 to sometimes a single fraction, but there’s also ever-deepening carved out roles for highly sophisticated ablative stereotactic body radiation (SBRT) plans. Enter the newest ASTRO guidelines on palliating symptomatic bone mets. When it comes to cord compression, there is little data on what therapy is most effective, and the group did not feel strongly that the addition of pre-radiation surgical decompression would be incrementally beneficial across the board. However, if surgical decompression is performed, there are strong recommendations for post-op radiation (as tumor is still present) along with bridging with dexamethasone. Table 5 summarizes evidence-based fractionation schedules with a key recommendation for SBRT over conventional radiation when patients have a good performance status and absent neurologic deficits given better rates of pain control. Key dose constraints are provided for initial SBRT (table 6) and for re-irradiation near the spinal cord (table 8). While there is data to support ablative re-irradiation of spine mets, not so for non-spine bone mets though highly-conformal plans (think IMRT) may be required to meet re-irradiation constraints even when employing conventional fractionation.
TBL: There are many data-driven scenarios where more sophisticated radiation plans for symptomatic bone mets can provide clinically meaningful benefits. | Alcorn, Pract Radiat Oncol 2024
The Guidelines: Not only can we now take a simple plan from 10 to 5 to sometimes a single fraction, but there’s also ever-deepening carved out roles for highly sophisticated ablative stereotactic body radiation (SBRT) plans. Enter the newest ASTRO guidelines on palliating symptomatic bone mets. When it comes to cord compression, there is little data on what therapy is most effective, and the group did not feel strongly that the addition of pre-radiation surgical decompression would be incrementally beneficial across the board. However, if surgical decompression is performed, there are strong recommendations for post-op radiation (as tumor is still present) along with bridging with dexamethasone. Table 5 summarizes evidence-based fractionation schedules with a key recommendation for SBRT over conventional radiation when patients have a good performance status and absent neurologic deficits given better rates of pain control. Key dose constraints are provided for initial SBRT (table 6) and for re-irradiation near the spinal cord (table 8). While there is data to support ablative re-irradiation of spine mets, not so for non-spine bone mets though highly-conformal plans (think IMRT) may be required to meet re-irradiation constraints even when employing conventional fractionation.
TBL: There are many data-driven scenarios where more sophisticated radiation plans for symptomatic bone mets can provide clinically meaningful benefits. | Alcorn, Pract Radiat Oncol 2024