Post-lockdown management of oncological priorities and postponed radiation therapy following the COVID-19 pandemic: Experience of the Institut Curie.

In France, as in most countries, strict strategies were implemented in cancer hospitals to reduce the spread of coronavirus (COVID-19), but to maintain as much as possible the capacity of oncology health services [1], [2]. These strategies included the reduction of elective services, an emphasis on remote visits, and the use of personal protective equipment [3], [4], [5], [6], [7]. International radiation therapy (RT) academic societies proposed to restrict the indications for treatment [8], to delay as long as possible the start of non-urgent treatments and to prefer hypofractionated regimens [9], [10], [11], [12], [13], [14], [15], [16]. To our knowledge, none of these recommendations anticipated how to handle the load of delayed treatments after the lockdown. However, the successful management of cancer treatments during lockdown undoubtedly correlates with the successful management of post-lockdown activity overload.

The Institut Curie has one of the largest RT departments in Europe. It is spread over three separate sites in the Paris area and has a total of eleven LINACs (six in Paris, four in Saint-Cloud and one in Orsay) and three treatment rooms for proton therapy in Orsay. In 2019, 5,860 patients were treated and the average number of treatment essions per month delivered was 8931, comprising 4183 sessions in Paris, 3303 in Saint-Cloud and 1445 in Orsay. In order to comply with the international recommendations mentioned above, several measures had to be applied in our department to protect both patients and operators from the risk of contamination. The challenges of post-crisis management following the COVID-19 pandemic therefore had to be anticipated. Here, we propose some key considerations to prepare for the post-lockdown period by presenting the guidelines adopted by the RT department of the Institut Curie.

During the French lockdown (in France from 17/03/20 to 11/05/20), priorities were established in order to limit the number of treatments. All indications for exclusive RT, whether or not combined with concomitant chemotherapy, were initiated without delay. These indications included not-yet-resected tumors (head and neck cancer, neurological cancer including glioblastoma, lung cancer, pediatric cancer, etc.), but excluded prostate cancer and metastatic tumours requiring local treatment, whatever the primary. Preoperative RT, stereotactic body RT, gynecological brachytherapy and proton therapy were provided throughout the lockdown without modifying the delay and the number of sessions (except for rectal cancer, i.e. 5 × 5 Gy). For breast cancer patients that had already begun RT and patients for whom irradiation (either for breast cancer or palliative treatment) was about to be started (planning in progress or completed but treatment not started), the number of sessions was adapted, giving priority to hypofractionation (workflow “adapt-COVID”) [17]. For patients whose treatment was not yet planned and whose start could be postponed for a few months, a new workflow called “break-COVID” was created and used to: (1) evaluate and identify the patients with delayed interventions during the crisis (delayed CT-scans, delayed treatment starts); (2) ensure the qualitative follow-up of delayed cases; (3) ensure the qualitative and quantitative follow-up of prescription changes; (4) resume treatment starts when the crisis is over by pushing forward the cases that were ready to start. The supplementary data 1 summarizes the fractionation and delay adjustments. It should be noted that specialized procedures such as isocentric lateral decubitus irradiation and Deep Inspiration Breath Hold for breast cancers, and brachytherapy for prostate cancers were suspended.

Similarly, the use of spirometry for respiratory gating in lung cancers was temporarily abandoned and replaced by 4D scanners in order to avoid handling high-risk components, such as breathing filters, to limit the risk of contamination as much as possible. Moreover, COVID+ patients were all treated on a dedicated machine, in prone position, using free-breathing VMAT technique and daily CBCT-based repositioning delivered on a Halcyon® (Varian®, PaloAlto, California). In this RT room, strict hygiene guidelines were established for all patients and operators. A dedicated circuit using a dedicated elevator and with arrows on the floor was set up in the RT department to avert contact between COVID+ and COVID− patients. We have used InSightive® software (Varian®) to provide a detailed analysis of all postponed treatments, and the projected evolution of the activity, i.e. the number of sessions per day in the RT department, during the periods before French lockdown, during lockdown, and following lockdown, respectively (Fig. 1 ).

Fig. 1

Title: Projected evolution of the activity in the RT department from January to June 2020 (excluding stereotactic irradiation and brachytherapy). Caption: Location details: Red and purple: breast irradiation in dorsal decubitus position, dark brown: breast irradiation in isocentric lateral decubitus position, light brown: head and neck and brain, magenta: lung, pink: pelvis (including prostate).

Therefore, the treatment strategy was changed for 333 patients (Fig. 2 ). The most affected locations were breast (N = 155) and prostate cancers (N = 66, including 26 permanent implants) (supplementary data 2). In order to optimally reschedule the 261 postponed treatments, priorities were established. The few patients with non-resected tumors (such as head and neck) who required confinement during the lockdown (e.g., severe COVID-19 infection) were reprogrammed to be first. The very few patients with postponed stereotactic irradiation were second. Then, in order: (1) hormone-receptor-negative breast cancer (and therefore with no treatment since surgery); (2) hormone-receptor-positive breast cancer (exceptionally treated with hormone therapy [HT] since surgery); (3) non-operated prostate cancer with no indication for HT; (4) operated prostate cancer with no indication for HT; (5) non-operated prostate cancer treated with HT; (6) and operated prostate cancer treated with HT. Patients with brain metastases not responding to corticosteroids and symptomatic patients remained a priority. Insightive® software provided a precise projection of the kinetics of postponed treatments, allowing us to anticipate a significant increase in the flow of patients requiring treatment in the department at the time of peak activity expected at the end of May and beginning of June 2020. Since May 11th 2020, we chose to prioritize shortening the delay to the start of RT for all patients treated post-lockdown while maintaining hypofractionated internationally validated schemes during the following months. The purpose of this 2-step procedure is to remain vigilant should there be consecutive waves of contamination.

Fig. 2

Title: Flow-chart summarizing the management changes occurring during lockdown. Caption: ILD: isocentric lateral decubitus irradiation, DD: dorsal decubitus irradiation, ILD = > DD: Re-planning ILD treatment in DD.

Finally, we highlighted some of the key issues in anticipating the end of COVID-19 crisis in a high-volume department of RT in a French comprehensive cancer center, and analyzed the use of certain techniques that could be continued outside the epidemic context, such as hypofractionation, and obtaining real-time data monitoring using data visualization tools.

Conflict of interest statement

None to declare.

Funding statement

None to declare.