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Table 3 Diseases associated with at least five RPD designated products (n = 26)

From: Analysis of the first ten years of FDA’s rare pediatric disease priority review voucher program: designations, diseases, and drug development

Most designated diseases

Number of RPD designations

Percentage of total RPD designations

Therapeutic area

Duchenne muscular dystrophy

30

5

Neurology

Neuroblastoma

21

4

Oncology

Sickle cell disease

18

3

Hematology

Diffuse intrinsic pontine glioma*

16

3

Oncology

Osteosarcoma

15

3

Oncology

Acute lymphoblastic leukemia

10

2

Oncology

Cystic fibrosis

8

1

Pulmonary

Epidermolysis bullosa

8

1

Dermatology

Congenital isolated hyperinsulinism

7

1

Endocrinology

Dravet syndrome

7

1

Neurology

Ewing sarcoma

7

1

Oncology

Friedreich ataxia

7

1

Neurology

GM2 gangliosidosis#

7

1

Metabolism

B-thalassemia

6

1

Hematology

Medulloblastoma

6

1

Oncology

Mucopolysaccharidosis type 1

6

1

Metabolism

Propionic acidemia

6

1

Metabolism

Spinal muscular atrophy

6

1

Neurology

Angelman syndrome

5

1

Neurology

Gaucher disease

5

1

Metabolism

Krabbe disease

5

1

Neurology

Lennox-Gastaut syndrome

5

1

Neurology

Mucopolysaccharidosis type 2

5

1

Metabolism

Netherton syndrome

5

1

Dermatology

Rett syndrome

5

1

Neurology

Rhabdomyosarcoma

5

1

Oncology

  1. *Diffuse intrinsic pontine glioma has also been classified as pediatric-type diffuse high-grade gliomas
  2. #GM2 gangliosidosis includes both Tay-Sachs and Sandhoff diseases
  3. 21 USC 360bb(a)(2) defines a “rare disease or condition” as: “any disease or condition which (A) affects less than 200,000 persons in the United States, or (B) affects more than 200,000 [sic] in the United States and for which there is no reasonable expectation that the cost of developing and making available in the United States a drug for such disease or condition will be recovered from sales in the United States of such drug.”