Data sources to collect information on treatment. Terminology & cornerstones to describe radiotherapy. Practical examples.

Use linkage with other data sources ▪ Aim = reconstruct timeline of treatments with respect to incidence date ▪ In practice ▪ Collect dates of different treatments ▪ Start date of radiotherapy – end date of radiotherapy ▪ Date of surgery/chemotherapy/targeted therapy ▪ Define timeframes around incidence date and/or surgery date ▪ Ex. [...] Use linkage with other data sources ▪ Aim = distinguish first line (multimodal) treatment from palliative intended radiotherapy ▪ In practice ▪ Collect dates of radiotherapy delivery ▪ Apply timeframes ▪ Treatment intent incorporated in used classification? ▪ Ex.: health insurance reimbursement code with description of palliative intent ▪ ICD-10-CM/PCS 18 Fractionation & number of fractions ▪ Radi. [...] Use linkage with other data sources ▪ Aim = distinguish different radiotherapy-schemes ▪ In practice ▪ Collect dates of radiotherapy delivery ▪ Type of fractionation-scheme incorporated in used classification? 19 ▪ Ex. [...] health insurance reimbursement code with description of fractionation Technique & used particle/isotope ▪ Radiotherapy can be delivered using different techniques: ▪ Conventional external beam (3D-CRT) ▪ Rotating (IMRT) ▪ Imaging on board (IGRT) ▪ Stereotactic (S(B)RT) ▪ Brachytherapy (interstitial versus intra-cavity) ▪ Radiotherapy can be delivered using different particles/isotopes: ▪ Standard. [...] Use linkage with other data sources ▪ Aim = distinguish different radiotherapy-techniques ▪ In practice ▪ Type of technique incorporated in used classification? ▪ Ex.