adj. ther.	adjuvant therapy
aRT	adjuvant RT
aCRT	adjuvant chemoradiotherapy
age (cont.)	age (continuous)
CCI	Charlson Comorbidity Index
CI	confidence interval
Colon-Ca	Colon cancer
DSS	disease specific survival
HR	hazard ratio
HNSCC	head and neck squamous cell carcinoma
LT-S	long-term survivor, i.e., living at the end of follow-up time
m	months
n.a.	not applicable
ND = neck diss	neck dissection
NSCLC	non-small cell lung cancer
OP+/-a[C]RT	surgery with adjuvant radiotherapy or adjuvant chemoradiotherapy, as indicated by risk and stage
OPL	open partial laryngectomy
Pneumo	Pneumonia
pCRT	primary chemoradiotherapy
pRT	primary radiotherapy
p(C)RT = pCRT or pRT	primary (chemo-)radiotherapy, primary chemoradiotherapy or primary radiotherapy
Rect-Ca	Carcinoma of the rectum
TL	total laryngectomy
TLM	transoral laser microsurgery
tu	death due to locoregional recurrent tumor
UICC	Union International Contre le Cancer (International Union against Cancer)
5-year OS	5-year overall survival
y	years