--- a
+++ b/README.md
@@ -0,0 +1,31 @@
+##About Dataset
+
+### Background: 
+There is limited research available on the factors that affect survival in patients with non-cirrhotic hepatocellular carcinoma (HCC-NCL). Our goal was to develop and validate a nomogram and a new risk stratification system to evaluate the overall survival (OS) in patients with HCC-NCL.
+
+### Data gathering: 
+Clinical informations on patients diagnosed with hepatocellular carcinoma between 2010 and 2019 were gathered using SEER*Stat 8.4.0.1, encompassing information from 17 different centers.
+
+### Data collation:
+ inclusion criteria: (1) Hepatocellular carcinoma (HCC) selected using ICD-O-3 histological codes (8170-3, 8171-3, 8172-3, 8173-3, 8174-3, 8175-3); (2) HCC patients without cirrhosis (Ishak 0-4; No to moderate fibrosis; METAVIR F0-F3; Batt-Ludwig 0-3). 
+
+### Exclusion criteria: 
+*(1) Race information unknown 
+*(2) Marital information unknown 
+*(3) Age less than 19 years or more than 100 years 
+*(4) Non-first primary tumor 
+*(5) Not pathologically confirmed by microscopy 
+*(6) Histological grade unknown 
+*(7) SEER grade unknown 
+*(8) T, N, M stage unknown 
+*(9) Surgical information unknown
+*(10) Tumor size unknown 
+*(11) Survival information unknown. 
+
+
+A total of 15 covariates were selected for analysis in this study, namely age, marital status, gender, race, AFP, radiotherapy, chemotherapy, systemic therapy, surgery, T stage, N stage, M stage, AJCC stage, tumor size and histologic grade. All patients were staged according to AJCC 8th edition. 
+
+The patients were categorized into three groups based on the RX Summ–Surg Prim Site (1998+) field. These groups include: 
+1) absence of surgery (A000); 
+2) local destruction of tumor (A100-A170); 
+3) liver resection or liver transplantation (A200-A750).
\ No newline at end of file