Rajaram Lab

Understanding Tissue Organization VIA MAchine Learning

 
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We are driven by the belief that the spatial organization of tissue provides a powerful  window into cell-cell interactions, a crucial component of disease progression and response. Yet, technical challenges have left this valuable source of information untapped: human comprehension can be overwhelmed by the complexity and size of individual tissue samples while purely automated approaches are hindered by the relative scarcity of independent tissue samples. By building approaches that leverage recent advances in machine learning within the framework established by biology, we hope to establish tissue organization itself as a predictive and investigative biomarker.

Research

 
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Our research lies at the intersection of cancer biology machine learning and pathology. We develop approaches to:

1. Incorporate Biological Priors

From a machine learning perspective, a fundamental and unique challenge is the massive (gigapixel) size of individual tissue samples relative to the smaller number (hundreds to low thousands) of independent patients. To overcome this, we develop machine machine learning approaches that incorporate biological knowledge accumulated over decades of experience with the unparalleled pattern extraction ability of deep learning neural networks.

2. Generate Robust Tissue Profiles

Tumor heterogeneity is a primary challenge in diagnosing and treating cancer. Practical constraints allow only a small fraction of a tumor to be profiled. How can we ensure we do not miss the part of the tumor that is driving tumor behavior? We combine spatial statistics with non-invasive modalities (e.g. radiology), to develop smart sampling strategies to ensure that we reliably capture the heterogeneity of a tumor.

3. Interpret Tissue Architecture

The biological origins of tissue phenotypes apart from nuclear morphology are poorly understood and are largely unused in pathology. We relate our tissue profiles to other assays (such as genetics or expression) to gain a better understanding of the underlying biology and as a first step towards generating models of progression and response.

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Lab Members

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Satwik Rajaram

Assistant Professor

Satwik's formal training is in theoretical physics. His switch to biology occured during his Ph.D (at the University of Illinois at Urbana Champaign) as he developed statistical-physics-inspired approaches to help humans comprehend high-dimensional biological data.

Satwik's post-doctoral research in the joint labs of Drs. Altschuler and Wu (at UTSW and then at UCSF) explored the implications of cellular heterogeneity, primarily through quantitative microscopy. He developed machine learning approaches that automatically identified relevant image phenotypes - sometimes invisible to the human eye - and accurately profiled heterogeneous cellular populations. His work also explored the associated experimental design questions, such as how few cells are needed to represent a population's heterogeneity reliably.

 

JOIn US!

We believe that it is a question of when, not if, machine learning revolutionizes pathology. To get there, there are several, biological, experimental and computational challenges to be overcome. We are constantly on the lookout for smart and motivated scientists (graduate students or postdocs) to join us in this effort. 

  • Unique multi-disciplinary training:  We are a machine learning lab at one of the top academic medical centers in the world, working on problems at the cutting edge of computation and biology. Do you want to learn how to leverage your machine learning background to tackle hard problems in biology? Or maybe you want to be trained in deep learning approaches that would scale up your pathology skills? Come talk to us.
  • Flexible startup-up like environment: We are a young lab in a new department committed to a fast pace. We are not afraid to break the old rules of academia to in search of what works best for our science. We've adopted open office plans with no reserved offices to maximize interactions. We have the ability to hire scientific programmers so that we can focus on algorithms+biology.
  • World-class computational facilities: the BioHPC and Bioinformatics Core Facility in our department provide the strong computational and analytical infrastructure necessary to build your projects.
  • High-standard of living: We offer competitive compensation that rewards industry experience and fellowships in a city with low cost of living.

For a more formal description of what we are looking for please look at our Jobs page.

 

 

 

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