A few decades ago, when the predominant belief was that breast cancer was caused by
viruses and when DNA sequencing technology was yet to be discovered, Dr. Mary-Claire
King proved that the disease was linked to genetic mutations. It took Dr. King — who is
currently Professor Genome Sciences at the University of Washington — 15 years to build a
mathematical model to support the hypothesis. In the 1990s, she and her team identified the
BRCA1 gene, popularly called the breast cancer gene.
Prof. King was in the city on Wednesday to give a lecture — Understanding Inherited Breast
and Ovarian Cancer: From Gene Discovery to Precision Medicine and Public Health — for
the seventh edition of the Cell Press-TNQ India Distinguished Lectureship Series, 2017.
She opened with a chart showing incidence rate of breast cancer in Bengaluru from the late
1980s to the present. The shape of the curve goes up rapidly, compared to the incidence rate
of cervical cancer which is dropping. This kind of pattern is reflected everywhere in the
world, but Bengaluru’s curve is one of the steepest.
“Breast cancer is uniquely a cancer of prosperity. It’s a cancer of women who are educated
and consequently decide to postpone having their children. Of young girls who are wellnourished
and consequently begin menstruation or menarche at a younger age,” she said,
adding that the interval between the age of menarche and the age of first pregnancy is now
three-four times longer than it was a 100 years ago. “And the link of that interval has been
shown by epidemiological studies worldwide to be primary determinant of breast cancer
risk,” she said.
While incidence of breast cancer is higher in the European Union and the U.S. when
compared with India, the mortality rates are “not that dissimilar”. “This is because survival is
poorer here because breast cancer still presents itself in India at considerably later stages,”
she said.
She underscored the importance of identifying and screening women above the age of 30 who
were at the very highest risk of developing breast and ovarian cancer. Breast cancer when
detected at its later stages, is much harder to eradicate. The best way to combat this is through
genetic to see if a person is predisposed to mutations.
But will India rise to this challenge? Screening does not come cheap, and will be a burden on
the country’s healthcare, but Prof. King expressed confidence in the technologies coming out
of India that will reduce costs. “If we are in a resource-limited environment, we can focus the
resources that there are on people for whom they will have the greatest yield,” said Prof.
King.
At the lecture, the finalists for the Inspiring Science Award for the best published scientific
paper in the Life Sciences from India were also announced.
Breaking barriers
When Dr. Mary-Claire King shifted her focus from mathematics to genetics at the University
of California, Berkeley, more than four decades ago, the field of science was as much a
testosterone-filled male dominated bastion as a male locker room. After she accepted a
position in the School of Public Health at her alma mater, the epidemiology division head
said to her, “I just want you to know that you are only here because of all these new
regulations, and we are really scraping the bottom of the barrel in hiring you.” Her reply was
a succinct, “We’ll see how long you feel that way.” And she did just that.
Source: The Hindu
viruses and when DNA sequencing technology was yet to be discovered, Dr. Mary-Claire
King proved that the disease was linked to genetic mutations. It took Dr. King — who is
currently Professor Genome Sciences at the University of Washington — 15 years to build a
mathematical model to support the hypothesis. In the 1990s, she and her team identified the
BRCA1 gene, popularly called the breast cancer gene.
Prof. King was in the city on Wednesday to give a lecture — Understanding Inherited Breast
and Ovarian Cancer: From Gene Discovery to Precision Medicine and Public Health — for
the seventh edition of the Cell Press-TNQ India Distinguished Lectureship Series, 2017.
She opened with a chart showing incidence rate of breast cancer in Bengaluru from the late
1980s to the present. The shape of the curve goes up rapidly, compared to the incidence rate
of cervical cancer which is dropping. This kind of pattern is reflected everywhere in the
world, but Bengaluru’s curve is one of the steepest.
“Breast cancer is uniquely a cancer of prosperity. It’s a cancer of women who are educated
and consequently decide to postpone having their children. Of young girls who are wellnourished
and consequently begin menstruation or menarche at a younger age,” she said,
adding that the interval between the age of menarche and the age of first pregnancy is now
three-four times longer than it was a 100 years ago. “And the link of that interval has been
shown by epidemiological studies worldwide to be primary determinant of breast cancer
risk,” she said.
While incidence of breast cancer is higher in the European Union and the U.S. when
compared with India, the mortality rates are “not that dissimilar”. “This is because survival is
poorer here because breast cancer still presents itself in India at considerably later stages,”
she said.
She underscored the importance of identifying and screening women above the age of 30 who
were at the very highest risk of developing breast and ovarian cancer. Breast cancer when
detected at its later stages, is much harder to eradicate. The best way to combat this is through
genetic to see if a person is predisposed to mutations.
But will India rise to this challenge? Screening does not come cheap, and will be a burden on
the country’s healthcare, but Prof. King expressed confidence in the technologies coming out
of India that will reduce costs. “If we are in a resource-limited environment, we can focus the
resources that there are on people for whom they will have the greatest yield,” said Prof.
King.
At the lecture, the finalists for the Inspiring Science Award for the best published scientific
paper in the Life Sciences from India were also announced.
Breaking barriers
When Dr. Mary-Claire King shifted her focus from mathematics to genetics at the University
of California, Berkeley, more than four decades ago, the field of science was as much a
testosterone-filled male dominated bastion as a male locker room. After she accepted a
position in the School of Public Health at her alma mater, the epidemiology division head
said to her, “I just want you to know that you are only here because of all these new
regulations, and we are really scraping the bottom of the barrel in hiring you.” Her reply was
a succinct, “We’ll see how long you feel that way.” And she did just that.
Source: The Hindu
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