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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 Groupings ICCC SEER Site
Oral Cavity and Pharynx XI(f) Other and unspecified carcinomas Lip, tongue, salivary gland, floor of mouth, gum and other mouth, nasopharynx, tonsil, oropharynx, other oral cavity and pharynx
XI(c) Nasopharyngeal carcinomas  
Digestive System VII(b) Hepatic carcinomas
VII(c) Unspecified malignant hepatic tumors
XI(f) Other and unspecified carcinoma Esophagus; 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 System XI(f) Other and unspecified carcinomas Larynx; lung and bronchus; trachea, mediastinum and other respiratory organs
Malignant Bone Tumors VIII(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 Sarcoma IX(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
Melanoma XI(d) Malignant melanomas  
Breast Cancer XI(f) Other and unspecified carcinomas Breast
Female Genital System X(c) Malignant gonadal germ cell tumors Ovary
X(d) Gonadal carcinomas
XI(f) Other and unspecified carcinomas
Corpus cervix; corpus uteri; ovary; vagina, vulvar, and other female genital organs
Male Genital System X(c) Malignant gonadal germ cell tumors Testis
XI(f) Other and unspecified carcinomas Prostate
Urinary System VI(b) Renal carcinoma
VI(c) Unspecified malignant renal tumors
XI(f) Other and unspecified carcinoma Urinary bladder; kidney and renal pelvis; ureter
Brain and Other Nervous System III(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
Endocrine XI(b) Thyroid carcinomas  
XI(f) Other and unspecified carcinoma Thyroid; other endocrine including thymus
Lymphoma II(a) Hodgkin lymphomas
II(b) Non-Hodgkin lymphomas (except Burkitt lymphomas)
II(c) Burkitt lymphoma
II(e) Unspecified lymphomas
Leukemia I(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
Other IV(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

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