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Prevalence estimates of Appendix 1: Classification of cancers in young adults (age 20–44 years) using International Classification of Childhood Cancer (ICCC), Third Edition and the Surveillance, Epidemiology and End Results (SEER) Site Recodes.

Major GroupingsICCCSEER Site
Oral Cavity and PharynxXI(f) Other and unspecified carcinomasLip, tongue, salivary gland, floor of mouth, gum and other mouth, nasopharynx, tonsil, oropharynx, other oral cavity and pharynx
XI(c) Nasopharyngeal carcinomas 
Digestive SystemVII(b) Hepatic carcinomas
VII(c) Unspecified malignant hepatic tumors
XI(f) Other and unspecified carcinomaEsophagus; stomach; colorectal (ascending colon, appendix, cecum, descending colon, hepatic flexure, large intestine NOS, rectosigmoid junction, rectum, sigmoid colon, splenic flexure, transverse colon); anus, anal canal, and anorectum; pancreas; gallbladder; other billary; other digestive
Respiratory SystemXI(f) Other and unspecified carcinomasLarynx; lung and bronchus; trachea, mediastinum and other respiratory organs
Malignant Bone TumorsVIII(a) Osteosarcomas
VIII(b) Chondrosarcomas
VIII(c) Ewing tumor and related sarcomas of bone
VIII(d) Other specified malignant bone tumors
Soft Tissue and Other Extraosseous SarcomaIX(a) Rhabdomyosarcomas
IX(b) Fibrosarcoma, peripheral nerve sheath tumors and other fibrous neoplasms
IX(c) Kaposi sarcoma
IX(d) Other specified soft tissue sarcomas
IX(e) Unspecified soft tissue sarcomas
MelanomaXI(d) Malignant melanomas 
Breast CancerXI(f) Other and unspecified carcinomasBreast
Female Genital SystemX(c) Malignant gonadal germ cell tumorsOvary
X(d) Gonadal carcinomas
XI(f) Other and unspecified carcinomas
Corpus cervix; corpus uteri; ovary; vagina, vulvar, and other female genital organs
Male Genital SystemX(c) Malignant gonadal germ cell tumorsTestis
XI(f) Other and unspecified carcinomasProstate
Urinary SystemVI(b) Renal carcinoma
VI(c) Unspecified malignant renal tumors
XI(f) Other and unspecified carcinomaUrinary bladder; kidney and renal pelvis; ureter
Brain and Other Nervous SystemIII(a) Ependymomas and choroid plexus tumor
III(b) Astrocytomas
III(c) Intracranial and intraspinal embryonal tumors
III(d) Other gliomas
III(e) Other specified intracranial and intraspinal neoplasms
III(f) Unspecified intracranial and intraspinal neoplasms
EndocrineXI(b) Thyroid carcinomas 
XI(f) Other and unspecified carcinomaThyroid; other endocrine including thymus
LymphomaII(a) Hodgkin lymphomas
II(b) Non-Hodgkin lymphomas (except Burkitt lymphomas)
II(c) Burkitt lymphoma
II(e) Unspecified lymphomas
LeukemiaI(a) Lymphoid leukemia
I(b) Acute myeloid leukemia
I(c) Chronic myeloproliferative diseases
I(d) Myelodysplastic syndrome and other myeloproliferative
I(e) Unspecified and other specified leukemias
OtherIV(b) Other peripheral nervous cell tumors
X(a) Intracranial and intraspinal germ cell tumors
X(b) Extracranial and extragonadal germ cell tumors
XI(a) Adrenocortical carcinomas
XI(e) Skin carcinomas
XI(f) Other and unspecified carcinomas
XII(a) Other specified malignant tumors
XII(b) Other unspecified malignant tumors

Not classified by ICCC