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Radiation therapy for cervical cancer: ASTRO guidelines

Written By : Hina Zahid |Medically Reviewed By : Dr. Kamal Kant Kohli Published On 2020-06-11T18:34:00+05:30  |  Updated On 11 Jun 2020 6:34 PM IST
Radiation therapy for cervical cancer: ASTRO guidelines
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ARLINGTON, Va. - American Society for Radiation Oncology (ASTRO) has released new clinical guideline for radiation therapy to treat patients with nonmetastatic cervical cancer.

Radiation is an integral part of cervical cancer treatment, either following surgery for patients at risk of recurrence or as a primary definitive treatment. The regimen involves pelvic external beam radiation therapy (EBRT), often combined with chemotherapy and a brachytherapy boost.

The guideline--ASTRO's first for cervical cancer--outlines indications and best practices for external beam radiation therapy and brachytherapy in the postoperative and definitive settings. Recommendations also address other treatments including chemotherapy and surgery when used in combination with radiation. The guideline is published online in Practical Radiation Oncology.

"Cervical cancer treatment has advanced dramatically over the last 20 years. Increased use of intensity-modulated radiation therapy (IMRT) and image-guided brachytherapy, in particular, have resulted in better patient outcomes and fewer treatment complications. Our intention in developing this guideline is to encourage physicians to make these approaches part of their daily practice," said Akila N. Viswanathan, MD, MPH, chair of the guideline task force and professor and interim director of radiation oncology and molecular radiation sciences at the Johns Hopkins Sidney Kimmel Cancer Center in Baltimore.

An estimated 13,800 American women will be diagnosed with invasive cervical cancer this year and nearly 4,300 women are expected to die from the disease. Cervical cancer can be highly treatable if detected early, however; the estimated five-year survival rate is 92% for early-stage disease and 56% for locally advanced disease. "Cervical cancer can be highly treatable if detected early; the estimated five-year survival rate is 92% for early-stage disease." The estimated five-year survival rate is 56% for locally advanced disease, however, underscoring the importance of early detection.

"We've moved from 2-D and 3-D treatments for the pelvis into IMRT, a highly focused form of radiation that reduces a patient's risk of treatment complications. We also have seen significant improvements in outcomes with image guidance for brachytherapy. Treatment teams use the most advanced imaging modalities available, and that allows us to treat exactly what we need to treat and avoid normal tissues," said Junzo Chino, MD, vice chair of the guideline task force and an associate professor of radiation oncology at Duke University Cancer Center in Durham, N.C.

The guideline's recommendations address the indications for postoperative and definitive radiation therapy, the use of chemotherapy in combination with radiation, the use of IMRT, and the indications and techniques of brachytherapy. Key recommendations are as follows:

Recommendations: Radiation Therapy for Locally Advanced Cervical Cancer

In the postoperative setting following radical hysterectomy, radiation with concurrent platinum-based chemotherapy (chemoradiation) is recommended for patients with high risk factors such as positive margins. Postoperative radiation therapy is recommended for patients with intermediate risk factors such as larger tumors. Risk criteria are defined in the guideline.

In the definitive setting, chemoradiation therapy is recommended for patients with FIGO stage IB3-IVA Definitive radiation or chemoradiation is conditionally recommended for patients with stage IA1-IB2 disease who are medically inoperable.

Intensity-modulated radiation therapy (IMRT) is recommended for postoperative EBRT and conditionally recommended for definitive EBRT, to reduce short-term and long-term toxicity.

Brachytherapy is strongly recommended for patients receiving definitive radiation or chemoradiation. Neither SBRT nor IMRT is a suitable substitute for brachytherapy. In the postoperative setting, brachytherapy is conditionally recommended with the presence of positive margin(s).

The guideline also addresses optimal dosing, fractionation and technique for EBRT and brachytherapy, including recommendations for image guidance, volume-based treatment planning and strategies to limit radiation spread to organs at risk.

COVID-19 and Cervical Cancer

The guideline was completed before the pandemic and therefore does not address COVID-19. Dr. Viswanathan and Dr. Chino also expressed concern about the effects of the coronavirus pandemic on patients with cervical cancer.

"Cervical cancer is one of those cancers where you just can't wait. You need to treat it right away in order to have the greatest chance of cure," said Dr. Viswanathan.

"I worry about women not coming in at a time when earlier treatment could be exceedingly beneficial to them," agreed Dr. Chino. "I hope that women who have symptoms will continue to be identified early and come in for treatment. We are also preparing for a potential surge of cases where, for understandable reasons, they did not seek screening or treatment as early as they may have before the pandemic. I fear that we will see more patients with more advanced disease."

Both doctors noted that their clinics implemented a series of safety enhancements and process upgrades that have allowed them to continue cervical cancer treatments safely during the pandemic. A recent ASTRO survey similarly found widespread adoption of screening, social distancing and other infection control measures at radiation oncology practices across the country.

Treatment-Related Side Effects

Treatment for cervical cancer can be a challenging experience for patients, given the proximity of the cervix to other critical organs in the pelvis and the combination of multiple therapies.

"Irrespective of the techniques used, radiation therapy for cervical cancer causes side effects for many patients, most commonly fatigue and complications in the bowel and bladder. Newer radiation technologies can significantly reduce these complications, however. The hallmark of MR-guided brachytherapy, for example, is fewer bowel or bladder side effects than with traditional brachytherapy techniques. Medications to manage side effects have also improved considerably," said Dr. Viswanathan.

"The issues facing women with cervical cancer are unique," said Dr. Chino. "Doing everything we can to eliminate the tumor is only part of our job. The other part is to make sure that patients are doing well throughout the treatment process."

For more details click on the link: http://dx.doi.org/10.1016/j.prro.2020.04.002

practical radiation oncologyastroradiation therapycervical cancer
Source : Practical Radiation Oncology
Hina Zahid
Hina Zahid

    Hina Zahid Joined Medical Dialogue in 2017 with a passion to work as a Reporter. She coordinates with various national and international journals and association and covers all the stories related to Medical guidelines, Medical Journals, rare medical surgeries as well as all the updates in the medical field. Email: editorial@medicaldialogues.in. Contact no. 011-43720751

    Dr. Kamal Kant Kohli
    Dr. Kamal Kant Kohli

    Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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