Chemotherapy in Combination with Radiotherapy for Definitive-intent Treatment of Stage II to IVA Nasopharyngeal Carcinoma: CSCO-ASCO Guideline

An interview with Dr. Jun Ma from Sun Yat-sen University Cancer Center in Guangzhou and the Chinese Society of Clinical Oncology on "Chemotherapy in Combination with Radiotherapy for Definitive-intent Treatment of Stage II to IVA Nasopharyngeal Carcinoma: Chinese Society of Clinical Oncology and American Society of Clinical Oncology Guideline." Read the full guideline at www.asco.org/head-neck-cancer-guidelines.

Transcript

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My name is Brittany Harvey, and today I'm interviewing Dr. Jun Ma from Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy in Guangzhou, and the Chinese Society of Clinical Oncology, author on Chemotherapy in Combination with Radiotherapy for Definitive-intent Treatment of Stage II to IVA Nasopharyngeal Carcinoma, Chinese Society of Clinical Oncology and American Society of Clinical Oncology Guideline. Thank you for being here today, Dr. Ma.

JUN MA: Yes.

BRITTANY HARVEY: First, I'd like to note that ASCO takes great care in the development of its guidelines in ensuring that the ASCO conflict-of-interest policy is followed for each guideline. The full conflict-of-interest information for this guideline panel is available online with the publication of the guideline in the Journal of Clinical Oncology. Dr. Ma, do you have any relevant disclosures that are directly related to this guideline topic?

JUN MA: Thank you, Brittany. Hi, everyone. I'm Dr. Jun Ma from the Sun Yat-sen University Cancer Center in China. And I don't have any potential conflicts of interest related to this guideline topic.

BRITTANY HARVEY: Great. Thank you. Then can you give us a general overview of what this guideline covers?

JUN MA: Yes. This guideline aims to highlight significant clinical questions about the chemotherapy in combination with the radiotherapy for the definitive treatment of stage II to stage IVA NPC, nasopharyngeal carcinoma, It will clarify the fundamental principles of the radiotherapy planning and how to combine chemo with radiotherapy for a patient's success.

BRITTANY HARVEY: Great. Then this guideline covers five clinical questions. I'd like to review those key recommendations for our listeners. First, what does the guideline state regarding radiotherapy for patients with stage II to IVA nasopharyngeal carcinoma?

JUN MA: Yes. For all nasopharyngeal carcinoma patients, we support the use of IMRT summarized in the current evidence. We don't recommend the use of other techniques, such as 2D or even 3D radiotherapy. If IMRT is not available at that spot, patients should be transferred to the institution that could that could implement IMRT whenever possible.

For all NPC patients, a prescribed dose of 70 Gy in 33 or 35 fractions delivered over seven weeks should be offered. It should be noted that the radiation dose may be adjusted according to the tumor volume and its response to the chemoradiotherapy. In terms of the target delineation, we recommend you to follow several existing consensus guidelines. Thank you.

BRITTANY HARVEY: OK. Then what is recommended regarding chemotherapy sequence in addition to radiotherapy?

JUN MA: OK, generally speaking, patients with low disease burden, such as the lower end category of clinical stage, could receive lower intensity of chemotherapy. For T2, and if not negative of patients, chemotherapy is not routinely recommended, while for T1 or 2, N1 patients concurrent chemotherapy may be offered, particularly for T2 N1 patients.

For locoregional advanced disease, except the T3 lymph node negative patients, we recommend the use after concurrent chemotherapy with induction or adjuvant chemotherapy. It should be noted that there is a lack of head-to-head trials comparing induction chemo plus concurrent chemoradiotherapy versus concurrent chemoradiotherapy plus adjuvant chemo. Thus, which sequence performs better in the contemporary era remains uncertain.

Finally, for T3 lymph node-negative patients, concurrent chemoradiotherapy should be offered. Adjuvant or induction chemotherapy may also be offered if there are adverse features, such as the bulky tumor volumes or high EBV DNA copy numbers.

BRITTANY HARVEY: Great. Then you just mentioned some chemoradiotherapy regimens. So for patients with nasopharyngeal carcinoma receiving concurrent chemoradiotherapy, what are the recommended chemotherapy options?

JUN MA: OK, for all NPC patient without contraindications, concurrent cisplatin should be offered along with radiotherapy. Weekly use after suspending with 48 milligrams per square meter or three weekly with eight or 200 milligram per square meter is acceptable. We recommended the cisplatin dose should be attempted to achieve a cumulative dose of at least 200 milligrams per square meter.

For patients with contraindications to cisplatin, nedaplatin, carboplatin, or oxaliplatin may be alternative choice. For patients with contraindications to cisplatin-based chemotherapy, Fluoropyrimidines such as 5FU with concurrent chemotherapy also may be offered. Thank you.

BRITTANY HARVEY: Great. And then for patients with nasopharyngeal carcinoma receiving induction chemotherapy, what are those recommended options?

JUN MA: Yes. For all patients receiving induction or adjuvant chemotherapy, platinum-based induction regimens should be offered in terms of induction chemo, such as GP, TPF, TP, PF, and the PX regimens are recommended. So induction regimens should be administered every three weeks for a total of three cycles, or at least the minimum two cycles. If the patients receive induction chemotherapy, chemoradiotherapy should be commenced within 21 to 28 days from the first day of the last cycle of induction chemotherapy.

BRITTANY HARVEY: Great. And then for the final set of recommendations for patients with nasopharyngeal carcinoma receiving adjuvant chemotherapy, what are those recommended chemotherapy options?

JUN MA: Considering that adjuvant chemotherapy is a choice of adjuvant regimens were much fewer than those of induction chemotherapy, according to current evidence. PF regimen administered every four weeks for a total of three cycles is recommended. If with contraindication to cisplatin, carboplatin may be combined with 5-FU.

It should be noted that for all patients receiving adjuvant chemotherapy and with contraindications to platinum-containing chemotherapy, the use of non-platinum based regimens remain experimental at this time and should not be offered routinely outside of the context of a clinical trial. The main difference between the recommendation for the induction and adjuvant chemotherapy are primarily due to the number of the randomized trials in which there are few studies regarding the adjuvant chemotherapy in nasopharyngeal carcinoma. Thank you.

BRITTANY HARVEY: Thank you for reviewing each of those recommendations. So then, what is the importance of this guideline? And how will it impact clinical practice in patients with nasopharyngeal carcinoma?

JUN MA: For nasopharyngeal carcinoma, it has extremely uneven geographically global distribution. More than 70 percent of this new diagnosis worldwide in the 2018 year, occurred in the East and Southeast Asia. Therefore, nasopharyngeal carcinoma remains a significant public health problem in these regions, which emphasize the significance of this guideline for providers and patients from the endemic area.

From my point of view, one of the novel features of this joint deadline is that it was developed through the international collaboration with the regional groups. Experts from the CSCO and ASCO shared interpretation of the evidence while accounting for the organizing national or cultural diversity of different regions. In brief, the guideline provides the guidelines on how to plan radiotherapy and when and how to add chemotherapy. Through the interpretation protecting the guideline, care providers can avoid over or under-treatment. And providing the most suitable chemoradiotherapy for NPC patients.

Besides, for the patients, they could receive the most suitable treatment, which is the balance of the efficiency as a quantity of the life. Thank you.

BRITTANY HARVEY: Great. Definitely, we appreciate the collaboration between the American Society of Clinical Oncology and the Chinese Society of Clinical Oncology. So thank you so much for your work on these guidelines. And thank you for your time today, Dr. Ma.

JUN MA: Thank you.

BRITTANY HARVEY: And thank you to all of our listeners for tuning in to the ASCO Guidelines podcast series. To read the full guideline, go to www.asco.org/head-neck-cancer-guidelines. You can also find many of our guidelines and interactive resources in the free ASCO Guidelines app available in iTunes or the Google Play Store. If you have enjoyed what you've heard today, please rate and review the podcast and be sure to subscribe so you never miss an episode.