For vaginal cylinder HDR in the setting of adjuvant endometrial cancer radiation, do you routinely alter the prescription dose based on the diameter of the cylinder?

Topics: Radiation Oncology • Gynecologic Cancers • Brachytherapy

Or would a typical prescription, such as 7 Gy x 3 Fx to 5 mm depth be reasonable for typical sizes 2.5-3.5 cm? Per ABS guidelines, they specify that the surface dose will vary for varying cylinder sizes and to alter accordingly.

Answer from: Radiation Oncologist at Academic Institution

The prescription dose will remain the same regardless of the size of the cylinder that is used and should be specified to the vaginal surface (often 6 Gy x 5) or to 5 mm depth (often 7 Gy x 3). Because of the inverse square law, the dose to the non-prescription point will vary as a function of...

Comments

Radiation Oncologist at Weill Cornell Medical College
Agree with Dr. @Klopp. I have the same approach.

Answer from: Radiation Oncologist at Community Practice

We keep the prescription dose the same regardless of the cylinder diameter. 7 Gy x 3, weekly treatment.

Comments

Radiation Oncologist at Universite de Montreal
7 Gy x 3 when prescribed at 5 mm depth. We prescri...

Radiation Oncologist at Allegheny Health Network
For 2.0/2.5 cm cylinders, I prescribe 5.0 Gy x 4 f...

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