603–048 A Father’s Love: Novazyme Pharmaceuticals, Inc.
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signs that something was wrong. At less than a year old, Megan was generally very healthy, but she
was failing to meet some key developmental milestones, such as holding herself up in her crib or
walking. When this condition continued to advance and their pediatrician could offer no explanation,
the Crowleys took Megan to a neurologist. In early January the doctor ran blood tests that showed an
elevated CPK,1 indicating something was wrong in Megan’s muscles. His initial guess was that she
had some type of myopathy, often referred to as “Floppy Baby Syndrome,” a catchall name for a
number of muscular diseases that cause infants to be weak and limp. Eventually the neurologist
performed a deep muscle biopsy, and on March 13, 1998, Megan was diagnosed with Pompe disease.
Crowley recalled, “The doctor had never diagnosed or treated a patient with Pompe disease
before. He had to go on Medline to give us any real information.” The neurologist estimated Megan
had somewhere between three and six months to live. The doctor also warned that Patrick, the
Crowleys’ third child, born five days earlier, might also have the disease. That night Aileen fell asleep
crying. Crowley stayed up surfing the Internet for any information he could find about this strange
and terrible disease.
Pompe Disease
Pompe (pom-pāy) was an extremely rare disease that fell in a broader family of ailments known as
lysosomal storage disorders (LSDs). LSDs were recessive autosomal diseases characterized by the
lysosomal accumulation of glycogen in a variety of tissues, which caused muscle dysfunction,
degeneration, and eventually death in most patients.2 More specifically, patients with Pompe lacked
the enzyme acid alpha–glucosidase (GAA) that enabled their cells to convert glycogen (sugar) into
energy and other usable matter. The unprocessed glycogen built up in the cells of smooth and
skeletal muscles, leading to extreme muscle atrophy. This atrophy usually became so severe that
patients were eventually unable to eat, breathe, speak, walk, or perform many other muscle–
dependent activities without aid. Patients in medium to advanced stages of Pompe often ate through
feeding tubes, breathed with the aid of ventilators, spoke in sign language, and got around by
wheelchair. Mortality was typically caused by cardiac failure from debilitated muscles or respiratory
failure.
Pompe disease was just one of 49 known LSDs including Fabry, Tay–Sachs, Gaucher, and MPS-I
(Hurler). While each of these disorders differed in its specific enzyme deficiency—and thus in the
way its symptoms ultimately manifested themselves—they had some similarities. First, they all
shared a common biological pathway leading to the accumulation of matter in certain organs and
tissues. Second, they all had extremely low levels of incidence, with Pompe affecting an estimated
5,000–10,000 people worldwide, Fabry 4,000–6,000, Gaucher 3,000–5,000, and MPS–I (Hurler) 3,000–
5,000. Finally, there were very few pharmaceutical treatments for these ailments (which contributed
to the high mortality rate); Gaucher was the only LSD with U.S. Food and Drug Administration
(FDA)–approved medications, Ceredase and Cerezyme, both manufactured by Genzyme.
1 CPK (creatine phosphate kinase) is a key enzyme in muscles. High levels of CPK are virtually diagnostic of muscular
diseases.
2 Lysosomes are structures within cells that are one site of glycogen breakdown.
For the exclusive use of P. Bhaskar, 2021.
This document is authorized for use only by Partha Bhaskar in EntMgt722_Spring2021 taught by Phil Greenwood, University of Wisconsin – Madison from Jan 2021 to May 2021.